阅读说明：本技术 二进制编码盘和采用该二进制编码盘的层析成像系统 (Binary code disk and tomography system using the same ) 是由 李保生 王晓巍 蔡峰 于 2021-07-06 设计创作，主要内容包括：一种层析成像系统,包括：柱面镜、光调制盘、汇聚透镜和点阵探测器；所述光调制盘包括圆盘,所述圆盘上由内向外划分多个圆心均与圆盘的圆心重合的圆环区域,各圆环区域上均沿圆周方向设有扇形孔,圆环区域上所有扇形孔对应的圆心角度之和作为该圆环区域的光通角度；各圆环区域的光通角度形成公比为2的等比数列。通过该系统可用点阵探测器对光信号进行探测,降低了系统成本。本系统借助层析成像原理,单像素情况下仍能保证成像的质量和极高的信噪比。(A tomographic imaging system comprising: the device comprises a cylindrical mirror, a light modulation disc, a converging lens and a point array detector; the light modulation disc comprises a disc, a plurality of circular ring areas with the circle centers coinciding with the circle centers of the disc are divided from inside to outside on the disc, fan-shaped holes are formed in each circular ring area along the circumferential direction, and the sum of the circle center angles corresponding to all the fan-shaped holes in each circular ring area is used as the light passing angle of the circular ring area; the light flux angles of the annular regions form an geometric series with a common ratio of 2. The system can detect the optical signal by using the dot matrix detector, thereby reducing the system cost. The system can still ensure the imaging quality and the extremely high signal-to-noise ratio under the condition of single pixel by means of the tomography principle.)

1. A binary coding disc is characterized by comprising a disc (21), wherein the disc (21) is divided into a plurality of circular ring areas concentric with the disc (21) from inside to outside, each circular ring area is provided with fan-shaped holes (22) along the circumferential direction, the widths of the fan-shaped holes (22) in all the circular ring areas in the radial direction of the disc are equal, and the sum of circle center angles corresponding to all the fan-shaped holes (22) in the circular ring areas is used as the light passing angle of the circular ring areas; the light flux angles of the annular regions form an geometric series with a common ratio of 2.

2. The binary coded disk as claimed in claim 1, characterized in that the width of the sector holes (22) in the annular region in any radial direction of the disk (21) is equal to the distance between the outer edge and the inner edge of the annular region in the radial direction of the disk (21).

3. The binary-coded disc according to claim 1, wherein the light transmission angle of each annular region increases or decreases sequentially along the radius direction from the inside to the outside of the disc (21).

4. The binary coded disk according to claim 3, wherein the fan-shaped holes (22) are distributed in a trapezoidal shape along the circumferential direction of the disk; alternatively, the disc (21) is divided into a plurality of sector areas with equal areas, and each sector area is rotationally symmetrical.

5. Binary-coded disc according to claim 1, characterized in that the disc (21) is further provided with marking holes (23), the marking holes (23) being located at the outer periphery of the most peripheral annular zone.

6. Binary-coded disc according to claim 5, characterized in that the disc (21) is provided with a plurality of uniformly distributed marking holes (23) in the circumferential direction.

7. A tomographic imaging system, comprising: the device comprises a cylindrical mirror (1), a light modulation disc (2), a converging lens (3) and a point array detector (4);

the cylindrical mirror (1) is used for compressing incident parallel light beams into one-dimensional light signals and transmitting the one-dimensional light signals to the light modulation disc (2), and emergent light of the cylindrical mirror (1) is located on the same side of the central axis of the light modulation disc (2); the light modulation disc (2) adopts a binary code disc as set forth in any one of claims 1-6;

the one-dimensional optical signals are transmitted to the converging lens (3) after passing through the optical modulation disc (2), the converging lens (3) focuses the one-dimensional optical signals into light spot signals, and the dot matrix detector (4) is used for detecting the light spot signals.

8. The tomography system of claim 7, further comprising a decoding module for binary decoding the detection values Φ of the lattice detector to obtain a one-dimensional decoded optical signal; or binary decoding the detection value phi by a dot matrix detector to obtain a one-dimensional decoded optical signal;

the formula for binary decoding the detection value phi of the lattice detector is as follows:

wherein, theta_iIndicating the light passage angle, theta, of the i-th annular region provided with the fan-shaped holes_minIs theta₁、θ₂、θ₃、……、θ_nN is the number of annular zones provided with scallops, theta_i/θ_minThe first term is 1 and the second term is 2, i is more than or equal to 1 and less than or equal to n; epsilon_iEqual to 0 or 1, epsilon_iRepresenting the encoded value of the ith circular region, the one-dimensional decoded optical signal being denoted as ε₁ε₂ε₃......ε_n。

9. The tomography system of claim 8, wherein the method of binary decoding the detection values of the lattice detector comprises the steps of:

s1, converting the light flux angle theta of the annular area_iAngle theta with minimum light flux_minThe ratio of (A) to (B) is recorded as a reference value of the circular ring area;

s2, obtaining the maximum value in the reference value which is less than or equal to the code value phi of the light spot signal as a selection object, and setting the code value corresponding to the selection object to 1;

s3, calculating the difference value between the code value phi of the light spot signal and the selected object as an allocation object;

s4, updating the selected object to be less than or equal to the maximum value in the reference values of the distribution objects, and setting the code value corresponding to the selected object to be 1;

s5, updating the distribution object to be the difference value between the distribution object and the selection object, then returning to the step S4, and looping the steps S4-S5 until the distribution object is 0.

10. The tomography system of claim 9, wherein step S1 further comprises: sorting the reference values of the circular ring areas from large to small;

the step S2 specifically includes the following steps:

s21, comparing the first reference value with the code value phi of the light spot signal according to the sequence from big to small;

s22, whether the reference value is less than or equal to the encoded value phi;

s23, if not, setting the code value corresponding to the reference value to 0; comparing the next reference value with the encoded value phi and returning to step S22;

s24, if yes, using the reference value as the selection object, setting the code value corresponding to the selection object to 1, and then executing the step S3;

the step S4 specifically includes the following steps:

s41, comparing the reference value after the object is selected with the allocated objects according to the descending order;

s42, whether the reference value is less than or equal to the allocation object;

s43, if not, setting the code value corresponding to the reference value to 0; comparing the next reference value with the assigned object and returning to step S42;

s44, if yes, the reference value is used as the selection object, the code value corresponding to the selection object is set to 1, and then the step S5 is executed;

step S5 specifically includes the following steps:

s51, whether or not there is a reference value smaller than the selection object;

s52, if yes, the distribution object is updated to be the difference value between the distribution object and the selection object, and then the step S41 is returned to;

and S53, if not, the decoding is completed.

Technical Field

The invention relates to the field of image processing, in particular to a binary code disc and a tomography system adopting the binary code disc.

Background

Background it is important to be able to image useful signals in the background noise, and the application of the tomography principle in image processing is very wide. The existing tomography system mostly adopts an area array detector or combines a cylindrical mirror and a linear array for detection. The integrated circuits of the area array detector and the linear array detector are complex, the integration difficulty is relatively high, and the cost is high. Therefore, in the conventional tomography, after a cylindrical mirror is adopted to compress a two-dimensional light beam into a one-dimensional light signal, the one-dimensional light signal is acquired by adopting the linear reciprocating motion of a dot matrix detector (namely, a single-pixel detector). Because the lattice detector collects optical signals in a motion state, the stability is poor, and the error rate is high.

Disclosure of Invention

In order to solve the defect of high construction cost of the tomography system in the prior art, the invention provides the binary coding disc and the tomography system adopting the binary coding disc, which can adopt the lattice detector in a static state to collect optical signals, reduce the construction cost of the tomography system in the operation and ensure the imaging quality.

One of the purposes of the invention adopts the following technical scheme:

a binary coding disc comprises a disc, wherein a plurality of circular ring areas with centers coinciding with the centers of the circular discs are divided from inside to outside on the disc, fan-shaped holes are formed in each circular ring area along the circumferential direction, the widths of the fan-shaped holes in all the circular ring areas in the radius direction of the disc are equal, and the sum of the center angles corresponding to all the fan-shaped holes in each circular ring area is used as the light passing angle of the circular ring area; the light flux angles of the annular regions form an geometric series with a common ratio of 2.

Preferably, the width of the fan-shaped hole in the circular ring area in any radial direction of the disc is equal to the distance between the outer edge and the inner edge of the circular ring area in the radial direction of the disc.

Preferably, the light passing angle of each annular area increases or decreases sequentially along the radius direction from inside to outside on the disc.

Preferably, the fan-shaped holes are distributed in a trapezoidal shape along the circumferential direction of the disc; or the disc is divided into a plurality of sector areas with equal areas, and each sector area is rotationally symmetrical.

Preferably, the disc is further provided with a marking hole, and the marking hole is positioned on the periphery of the most peripheral annular area.

Preferably, a plurality of uniformly distributed marking holes are formed in the disc along the circumferential direction.

The second purpose of the invention adopts the following technical scheme:

a tomographic imaging system comprising: the device comprises a cylindrical mirror, a light modulation disc, a converging lens and a point array detector;

the cylindrical mirror is used for compressing the incident parallel light beams into one-dimensional light signals and transmitting the one-dimensional light signals to the light modulation disc, and emergent light of the cylindrical mirror is positioned on the same side of the central axis of the light modulation disc; the light modulation disc adopts the binary coding disc;

the one-dimensional optical signals are transmitted to the converging lens after passing through the optical modulation disc, the converging lens focuses the one-dimensional optical signals into light spot signals, and the dot matrix detector is used for detecting the light spot signals.

Preferably, the optical fiber grating detector further comprises a decoding module, wherein the decoding module is used for performing binary decoding on the detection values of the lattice detector to obtain a one-dimensional decoded optical signal; or binary decoding the detection value phi by a dot matrix detector to obtain a one-dimensional decoded optical signal;

the formula for binary decoding the detection value phi of the lattice detector is as follows:

wherein, theta_iIndicating the light passage angle, theta, of the i-th annular region provided with the fan-shaped holes_minIs theta₁、θ₂、θ₃、……、θ_nN is the number of annular zones provided with scallops, theta_i/θ_minThe first term is 1 and the second term is 2, i is more than or equal to 1 and less than or equal to n; epsilon_iEqual to 0 or 1, epsilon_iRepresenting the encoded value of the ith circular region, the one-dimensional decoded optical signal being denoted as ε₁ε₂ε₃......ε_n。

Preferably, the decoding method of the decoding module includes the steps of:

s1, converting the light flux angle theta of the annular area_iAngle theta with minimum light flux_minThe ratio of (A) to (B) is recorded as a reference value of the circular ring area;

s2, obtaining the maximum value in the reference value which is less than or equal to the code value phi of the light spot signal as a selection object, and setting the code value corresponding to the selection object to 1;

s3, calculating the difference value between the code value phi of the light spot signal and the selected object as an allocation object;

s4, updating the selected object to be less than or equal to the maximum value in the reference values of the distribution objects, and setting the code value corresponding to the selected object to be 1;

s5, updating the distribution object to be the difference value between the distribution object and the selection object, and then returning to the step S4 until the distribution object is 0.

Preferably, step S1 further includes: sorting the reference values of the circular ring areas from large to small;

the step S2 specifically includes the following steps:

s21, comparing the first reference value with the coded value phi according to the sequence from big to small;

s22, whether the reference value is less than or equal to the encoded value phi;

s23, if not, setting the code value corresponding to the reference value to 0; comparing the next reference value with the encoded value phi and returning to step S22;

s24, if yes, using the reference value as the selection object, setting the code value corresponding to the selection object to 1, and then executing the step S3;

the step S4 specifically includes the following steps:

s41, comparing the reference value after the object is selected with the allocated objects according to the descending order;

s42, whether the reference value is less than or equal to the allocation object;

s43, if not, setting the code value corresponding to the reference value to 0; comparing the next reference value with the assigned object and returning to step S42;

s44, if yes, the reference value is used as the selection object, the code value corresponding to the selection object is set to 1, and then the step S5 is executed;

step S5 specifically includes the following steps:

s51, whether or not there is a reference value smaller than the selection object;

s52, if yes, the distribution object is updated to be the difference value between the distribution object and the selection object, and then the step S41 is returned to;

and S53, if not, the decoding is completed.

The invention has the advantages that:

(1) the tomography system adopts the binary coding disc as the light modulation disc, the one-dimensional light signal emitted by the cylindrical mirror is subjected to binary coding after the light modulation disc rotates for one circle, so that the intensity value of the light spot signal emitted by the convergent lens can be obtained according to the one-dimensional light signal subjected to binary coding by the light modulation disc, otherwise, the one-dimensional light signal subjected to binary coding by the light modulation disc can be reversely pushed according to the intensity value of the light spot signal emitted by the convergent lens, namely the detection value of the dot matrix detector, and the binary decoding can be carried out on the detection value of the dot matrix detector. The system can detect the optical signal by using the dot matrix detector, thereby reducing the system cost. The system can still ensure the imaging quality and the extremely high signal-to-noise ratio under the condition of single pixel by means of the tomography principle.

(2) The one-dimensional light signal emitted by the cylindrical mirror is converted into a light spot signal by the application of the convergent lens, and the dot matrix detector can detect the light spot signal in a static state, so that the working reliability of the dot matrix detector is ensured. Meanwhile, binary coding is carried out on the one-dimensional optical signal through the optical modulation disc, and a unique solution is realized for decoding the intensity value of the light spot signal detected by the dot matrix detector, so that the reliability of modeling of the target object by restoring the one-dimensional optical signal according to the detector of the dot matrix detector is ensured. The light modulation disc rotates for one circle to realize sequential binary coding, the intensity of light spot signals is periodically superposed along with the increase of the number of the rotation circles of the light modulation disc, and the detection value of the dot matrix detector is increased, so that the detection precision is improved, the analysis of the object light in an integral amplification state is realized, and the accuracy of the object light analysis and the target object modeling is ensured.

(3) The widths of the fan-shaped holes in different circular areas are equal, and the widths are the widths of the fan-shaped holes in the radius direction of the disc, so that the accuracy of calculating the luminous flux of each circular area according to the central angle is ensured, and the reliability of binary coding on an optical signal is ensured.

(4) The width of the fan-shaped holes in the circular ring area in any radial direction of the disc is equal to the distance between the outer edge and the inner edge of the circular ring area in the radial direction of the disc. Therefore, the regularity of the fan-shaped holes is favorably ensured, the shielding of the edge positions of the fan-shaped holes on light rays is avoided, and the reliability of binary coding of one-dimensional optical signals is further ensured.

(5) The arrangement of the marking holes can be used for counting the rotation angle of the disc, so that the rotation number of the disc can be accurately calculated, and the detection values of the dot matrix detector can be accurately decoded by combining the rotation number of the disc.

(6) The invention provides a specific coding and decoding method, which ensures the accuracy of decoding the detection values of the dot-matrix detector.

Drawings

FIG. 1 is a schematic plan view of a binary code disc;

FIG. 2 is a schematic illustration of an optical path of a tomographic imaging system;

FIG. 3 is a schematic plan view of another binary coded disk;

FIG. 4 is a schematic plan view of another binary-coded disk;

FIG. 5 is a schematic plan view of yet another binary code disc;

FIG. 6 is a flow chart of a light intensity decoding method for a tomographic imaging system;

FIG. 7 is a flow chart of another light intensity decoding method for a tomographic imaging system;

FIG. 8 is a verification image used in an embodiment.

The figure is as follows: 1. a cylindrical mirror; 2. a light modulation panel; 21. a disc; 22. a sector hole; 23. marking the hole; 24. mounting holes; 3. a converging lens; 4. a dot matrix detector; A. an object.

Detailed Description

The present embodiment provides a tomographic imaging system, including: cylindrical mirror 1, light modulation disc 2, convergent lens 3 and lattice detector 4.

The cylindrical mirror 1 is used for compressing the incident parallel light beams into one-dimensional light signals and transmitting the one-dimensional light signals to the light modulation disc 2, and emergent light of the cylindrical mirror 1 is located on the same side of the central axis of the light modulation disc 2.

The one-dimensional optical signal is transmitted to the converging lens 3 after passing through the optical modulation disc 2, the converging lens 3 focuses the one-dimensional optical signal into a light spot signal, and the dot matrix detector 4 is used for detecting the light spot signal.

The binary coding disc provided by the embodiment comprises a disc 21, wherein a plurality of circular ring areas with centers coinciding with the centers of the disc 21 are divided from inside to outside on the disc 21, each circular ring area is provided with fan-shaped holes 22 along the circumferential direction, the widths of the fan-shaped holes 22 in all the circular ring areas in the radial direction of the disc are equal, and the sum of the center angles corresponding to all the fan-shaped holes 22 in the circular ring areas is used as the light passing angle of the circular ring area; the light flux angles of the annular regions form an geometric series with a common ratio of 2. Specifically, the number of the fan-shaped holes 22 provided in any one ring area may be one or more.

In practical implementation, the edge of the sector hole 22 along the circumferential direction may be an arc, a wavy line, a broken line, or the like. When the edge of the sector hole 22 in the circumferential direction is an arc, the width of the sector hole 22 is the distance between the outer edge arc and the inner edge arc of the sector hole 22 in the radial direction of the disc 21; when the circumferential edge of the sector hole 22 is a wavy line or a broken line, the width of the sector hole 22 is the distance between the center line of the outer edge and the center line of the inner edge of the sector hole 22 in the radial direction of the disc 21. The outer edge of the sector hole 22 is the edge of the sector hole 22 facing away from the center of the disc 21, and the inner edge of the sector hole 22 is the edge of the sector hole 22 close to the center of the disc 21. The center line of the outer edge of the fan-shaped hole 22 and the center line of the inner edge of the fan-shaped hole 22 are both arcs concentric with the disc 21.

The light rays transmitted to the other side of the disc 21 through the fan-shaped holes 22 on each circular ring area correspond to the light flux angle of the circular ring area, and the light flux angle of each circular ring area forms an equal ratio sequence with a common ratio of 2, so that the coding and decoding of any binary coded value can be realized through the coding of the circular ring area.

The tomography system adopts the binary coding disc as the light modulation disc, the one-dimensional light signal emitted by the cylindrical mirror 1 is subjected to binary coding after the light modulation disc rotates for one circle, so that the intensity value of the light spot signal emitted by the convergent lens 3 can be obtained according to the one-dimensional light signal subjected to binary coding by the light modulation disc 2, otherwise, the one-dimensional light signal subjected to binary coding by the light modulation disc 2 can be reversely pushed according to the intensity value of the light spot signal emitted by the convergent lens 3, namely the detection value of the dot matrix detector, and the detection value of the dot matrix detector can be subjected to binary decoding.

In this embodiment, the converging lens 3 is applied to convert the one-dimensional optical signal emitted from the cylindrical mirror 1 into a light spot signal, and the dot matrix detector 4 can detect the light spot signal in a static state, thereby ensuring the reliability of the operation of the dot matrix detector 4. Meanwhile, the one-dimensional optical signal is binary coded through the optical modulation disc 2, and a unique solution is realized for decoding the intensity value of the light spot signal detected by the dot matrix detector 4, so that the reliability of realizing the modeling of the target object A by restoring the one-dimensional optical signal according to the detector of the dot matrix detector 4 is ensured.

Meanwhile, under the condition that the target object A is not changed, the object light which is incident on the light receiving surface of the cylindrical mirror 1 and carries the information of the target object A is constant, the light modulation disc 2 rotates for a circle to realize sequential binary coding, the intensity of light spot signals is periodically superposed along with the increase of the number of the rotation cycles of the light modulation disc 2, and the detection value of the dot matrix detector 4 is increased, so that the detection precision is improved, the analysis of the object light under the integral amplification state is realized, and the accuracy of the object light analysis and the target object A modeling is ensured.

In the present embodiment, the width of the fan-shaped hole 22 in the annular region in any radial direction of the disk 21 is equal to the distance between the outer edge and the inner edge of the annular region in the radial direction of the disk 21. Therefore, the regularity of the fan-shaped holes 22 is ensured, the light rays are prevented from being shielded by the edge positions of the fan-shaped holes 22, and the reliability of binary coding of the one-dimensional optical signals is further ensured.

Specifically, fig. 1, fig. 3, fig. 4, and fig. 5 show schematic diagrams of various binary code discs, and those skilled in the art should understand that the specific embodiments of the binary code discs are not limited to the diagrams.

In the present embodiment, the light passing angles of the circular ring regions sequentially increase or decrease along the radial direction from the inside to the outside of the disc 21, as shown in fig. 1 or fig. 5, so as to ensure the regular distribution of the fan-shaped holes 22 on the disc, and facilitate the processing of the disc 21. Further, the fan-shaped holes 22 may be distributed in a trapezoidal shape along the circumferential direction of the disk, as shown in fig. 1, or the disk 21 may be divided into a plurality of fan-shaped regions with equal areas, and each fan-shaped region may be rotationally symmetric, as shown in fig. 3.

In the present embodiment, the disc 21 is further provided with a mark hole 23, and the mark hole 23 is located on the outer periphery of the most peripheral annular region. The arrangement of the marking holes 23 can be used for counting the rotation angle of the disc 21. In practical implementation, in order to further ensure accurate monitoring of the rotation angle of the disc 21, a plurality of uniformly distributed marking holes 23 are formed in the disc 21 along the circumferential direction.

The tomography system provided in this embodiment further includes a decoding module, where the decoding module is configured to perform binary decoding on the detection value of the lattice detector to obtain a one-dimensional decoded optical signal, and a format of the one-dimensional decoded optical signal is as follows: epsilon₁ε₂ε₃......ε_nWherein, epsilon_iRepresenting the coded value, ε, of the ith circle region_iIs equal to 0 or 1, i is more than or equal to 1 and less than or equal to n, and n is the number of the circular ring areas; the light flux angle of the ith annular region is denoted as θ_iWill theta₁、θ₂、θ₃、……、θ_nThe minimum value of (A) is denoted as θ_minAnd the code value of the light spot signal is recorded as phi, then:

specifically, the decoding module performs binary decoding on the detection values of the point array detector according to the formula to obtain a unique solution.

In this embodiment, the decoding method of the decoding module includes the steps of:

s1, converting the light flux angle theta of the annular area_iAnd minimum lightThrough angle theta_minThe ratio of (d) is recorded as a reference value for the annular region. It can be seen that the reference value for each circular ring region constitutes an geometric series with a first term of 1 and a common ratio of 2.

S2, obtaining the maximum value of the reference values less than or equal to the code value phi of the light spot signal as the selection object, and setting the code value corresponding to the selection object to 1.

And S3, calculating the difference value between the code value phi of the light spot signal and the selected object as an allocation object.

S4, the selected object is updated to be less than or equal to the maximum value among the reference values of the allocation objects, and the code value corresponding to the selected object is set to 1.

S5, updating the distribution object to be the difference value between the distribution object and the selection object, and then returning to the step S4 until the distribution object is 0.

Specifically, the code values other than the code value set to 1 are all set to 0, that is, all the code values corresponding to the reference values that have not been selected as objects are all set to 0, so as to complete binary decoding of the code values of the light spot signal. In a specific implementation, in step S5, all the code values except 1 may be set to 0.

In a further embodiment, the decoding method of the decoding module comprises the following steps:

s1, converting the light flux angle theta of the annular area_iAngle theta with minimum light flux_minThe ratio of (A) to (B) is recorded as the reference value of the circular ring area, and the reference values of the circular ring areas are sorted from large to small.

And S21, comparing the first reference value with the code value phi according to the descending order.

S22, whether the reference value is less than or equal to the encoded value phi.

S23, if not, setting the code value corresponding to the reference value to 0; the next reference value is compared with the encoded value phi and returns to step S22.

If yes at S24, the reference value is set as the selection object, the code value corresponding to the selection object is set to 1, and then step S3 is executed.

And S3, calculating the difference value between the code value phi of the light spot signal and the selected object as an allocation object.

S41, the reference value after the object is selected is compared with the assigned object in descending order.

S42, whether the reference value is less than or equal to the allocation object.

S43, if not, setting the code value corresponding to the reference value to 0; the next reference value is compared with the allocation object, and the process returns to step S42.

If yes at S44, the reference value is set as the selection object, the code value corresponding to the selection object is set to 1, and then step S51 is executed.

S51, whether or not there is a reference value smaller than the selection object.

S52, if yes, the distribution object is updated to the difference value between the distribution object and the selection object, and then the step S41 is returned to.

And S53, if not, the decoding is completed.

The operation of the tomography system is explained below with reference to a specific embodiment. In this embodiment, an image of the object a is shown in fig. 8, and a resolution matrix image thereof is ideally shown in table 1 below.

Table 1: FIG. 8 shows the resolution matrix of the ideal image

				1	1
														1	1
			1	1	1	1
													1	1	1	1
			1	1	1	1
														1	1
				1	1
														1	1
				1	1
														1	1

During actual detection, the light intensity of each pixel point in the resolution matrix only changes due to the influence of the light intensity. For example, assuming that the light intensity is weak in the present embodiment, the actual resolution matrix is as shown in table 2 below.

Table 2: FIG. 8 shows the resolution matrix of the actual image

				0.1	0.1
														0.1	0.1
			0.1	0.1	0.1	0.1
													0.1	0.1	0.1	0.1
			0.1	0.1	0.1	0.1
														0.1	0.1
				0.1	0.1
														0.1	0.1
				0.1	0.1
														0.1	0.1

As can be seen, in the present embodiment, if the resolution threshold is set to 0.5, the image shown in fig. 8 is not recognizable.

In order to improve the resolution of the image, the image may be integrated by any angle through the cylindrical mirror 1. In this embodiment, the image is integrated in the vertical direction, so that a one-dimensional resolution matrix, i.e., a one-dimensional optical signal, as shown in table 3 below is obtained.

Table 3: resolution matrix after vertical integration of table 2

0

0

0

0.3

1

1

0.3

0

0

0

In this embodiment, the resolution threshold is set to 0.5, and when the light intensity lower than the resolution threshold is set to 0 and the light intensity higher than or equal to the resolution threshold is set to 1, the resolution matrix shown in table 3 is converted to that shown in table 4.

Table 4: resolution matrix after conversion of table 3

0

0

0

0

1

1

0

0

0

0

The tomographic imaging system in the present embodiment employs the light modulation panel 2 as shown in fig. 5. In this embodiment, the area on the disc 21 where the sector holes 22 need to be machined is equally divided into 10 circular ring areas in the radial direction, that is, the circular ring areas on which the sector holes 22 are machined are equal in width in the radial direction of the disc 21, and the width of the sector hole 22 is equal to the width of the circular ring area where the sector hole is located, so as to ensure that the widths of the sector holes 22 on different circular ring areas are equal.

In this embodiment, when the optical modulation disc 2 rotates once, the light intensity value of the light spot signal detected by the dot matrix detector 4 is 48, which is the encoded value of the light spot signal.

In this embodiment, there are 10 circular ring regions provided with the fan-shaped holes 22, and the 10 circles are arranged in order of decreasing light passage angle to increasing light passage angleThe reference values corresponding to the ring regions are: 1. 2. the following⁰、2¹、2²、2³、2⁴、2⁵、2⁶、2⁷、2⁸、2⁹。

2⁵≤48≤2⁶，48-2⁵＝16＝2⁴；

That is, in the present embodiment, the code value of the spot signal is phi 48 or 2⁵+2⁴；

I.e., phi 48 is 0 × 2⁰+0×2¹+0×2²+0×2³+1×2⁴+1×2⁵+0×2⁶+0×2⁷+0×2⁸+0×2⁹

According to the above formula, the resolution matrix of the binary decoded one-dimensional optical signal can be obtained as follows: 0000110000, respectively; this resolution matrix is in accordance with table 4, which demonstrates the feasibility of the system.

The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.