Image correction method and device for handheld backscatter x-ray imaging device

Abstract

The application discloses an image correction method and device of a handheld backscattering X-ray imaging device, and is applied to the technical field of X-ray imaging, and the method comprises the following steps: acquiring a scattering image through the handheld backscattering X-ray imaging device; obtaining a scattering mean value signal based on grouping of a gap and weighted statistical averaging of a plurality of imaging lines generated by the gap; performing vertical direction and horizontal direction calibration on the scattering mean value signal to obtain a vertical direction calibration coefficient and a horizontal direction correction coefficient; and performing image correction on the scattering image according to the vertical direction calibration coefficient and the horizontal direction correction coefficient. The method effectively solves the problems of image horizontal stripes and uneven brightness and darkness, and improves the imaging quality.

Description

Technical Field

[0001] This invention relates to the field of X-ray imaging technology, and in particular to an image correction method and apparatus for a handheld backscatter X-ray imaging device. Background Technology

[0002] A handheld backscatter X-ray imaging device is a portable device that uses the principle of X-ray scattering imaging to detect contraband inside objects. It is used in applications where the imaging detector and X-ray source are on the same side for imaging. The core working principle of a handheld backscatter X-ray detection device is as follows: a fan-shaped X-ray source emits flying-point X-ray spots through a high-speed rotating chopper, and the detector panel synchronously receives the scattered signal of each flying-point spot. Typically, backscatter devices have photoelectric switches at the slits of the chopper to determine the starting signal of each slit. The signals emitted from each slit are stitched together to form a line, and the detection signals from each slit are stitched together sequentially to form a scattered transparent image.

[0003] Existing X-ray backscatter imaging equipment typically does not group the chopper wheel slits, instead relying on methods such as improving processing precision or digital image post-processing to smooth and filter noise in images with horizontal stripes. While this can reduce the impact of the horizontal stripes, it lacks the original grouping information for each stripe, and relying solely on digital smoothing and other methods cannot achieve targeted and effective image processing.

[0004] To overcome these shortcomings, this application proposes an image correction method and apparatus for a handheld backscatter X-ray imaging device. Summary of the Invention

[0005] The purpose of this application is to provide an image correction method and apparatus for a handheld backscatter X-ray imaging device, which aims to solve the above-mentioned problems.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] In a first aspect, this application provides an image correction method for a handheld backscattered X-ray imaging device, applied to the handheld backscattered X-ray imaging device, which includes: a fan-beam X-ray source, a chopper, dual photoelectric switches, and a detector panel; the fan-beam X-ray source is used to generate X-rays; the chopper is disposed in front of the fan-beam X-ray source and has several slits for modulating X-rays; the dual photoelectric switches are used to mark the chopper, a first photoelectric switch is used to record the start of each imaging line, and a second photoelectric switch is used to encode the slits on the chopper; the detector panel is used to receive backscattered X-ray signals.

[0008] The image correction method for a handheld backscatter X-ray imaging device includes:

[0009] acquire a scattering image by the handheld backscattering X-ray imaging device;

[0010] obtain a scattering mean value signal based on grouping the slits and weighted statistical average of the imaging lines generated by the slits;

[0011] calibrate the scattering mean value signal in the vertical direction and the horizontal direction to obtain a vertical direction calibration coefficient and a horizontal direction correction coefficient;

[0012] correct the image according to the vertical direction calibration coefficient and the horizontal direction correction coefficient.

[0013] In a second aspect, the present application provides an image correction device of a handheld backscattering X-ray imaging device, comprising:

[0014] an image acquisition and processing module: acquire a scattering image by the handheld backscattering X-ray imaging device; obtain a scattering mean value signal based on grouping the slits and weighted statistical average of the imaging lines generated by the slits;

[0015] a correction coefficient calculation module: calibrate the scattering mean value signal in the vertical direction and the horizontal direction to obtain a vertical direction calibration coefficient and a horizontal direction correction coefficient;

[0016] an image correction module: correct the image according to the vertical direction calibration coefficient and the horizontal direction correction coefficient.

[0017] In a third aspect, the present application provides a handheld backscattering X-ray imaging device, comprising a processor and a memory coupled with the processor, wherein the memory stores program instructions for implementing an image correction method of a handheld backscattering X-ray imaging device; the processor is configured to execute the program instructions stored in the memory to implement an image correction method of a handheld backscattering X-ray imaging device.

[0018] In a fourth aspect, the present application provides a storage medium storing program instructions executable by a processor, wherein the program instructions are used to execute an image correction method of a handheld backscattering X-ray imaging device.

[0019] The present application provides an image correction method and device of a handheld backscattering X-ray imaging device, which has the following beneficial effects:

[0020] (1) The double photoelectric switches are used to chop the wheel marks, which realizes accurate identification and grouping of each slit, provides a basic condition for subsequent correction, and enables the device to perform targeted correction processing according to the inconsistency of each slit, thereby significantly improving the uneven light and dark problem of the image;

[0021] (2) By weighted statistical average and curve fitting correction method, effectively smooth the image of horizontal stripes and longitudinal uneven phenomenon, so that the image is more clear, delicate, improve the overall quality and resolution of the image;

[0022] (3) The method proposed in the application is not only suitable for handheld backscattering X-ray imaging device, but also can be popularized to other imaging devices, by correcting the inconsistency in the image, enhancing the applicability and reliability of the device, so that the device can perform excellent performance in various application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Figure 1 is a flowchart of an image correction method for a handheld backscattering X-ray imaging device according to an embodiment of the present application;

[0024] Figure 2 Figure 2 is a schematic diagram of a chopper wheel and its marking method according to an embodiment of the present application. The slit of the chopper wheel is crucial to the resolution and image quality of backscattering imaging. The best theoretical slit width and shape can be obtained by simulation method. However, in the actual processing process, due to the material of the chopper wheel is usually high-density high-atomic-number alloy material, the actual processing precision is difficult to guarantee, and the width and shape of the five slits cannot be completely consistent, and the intersection position angle of the same slit and X-ray is also inconsistent. That is, there are the following problems:

[0025] Figure 3 Figure 3 is a schematic diagram of the imaging principle of a handheld backscattering X-ray imaging device according to an embodiment of the present application;

[0026] Figure 4 Figure 4 is a structural schematic diagram of an image correction device for a handheld backscattering X-ray imaging device according to an embodiment of the present application;

[0027] Figure 5 Figure 5 is a structural schematic diagram of a handheld backscattering X-ray imaging device according to an embodiment of the present application;

[0028] Figure 6 Figure 6 is a structural schematic diagram of a storage medium according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0030] The following analyzes the scheme in the prior art in combination with related technologies.

[0031] Please refer to Figure 2 , Figure 2 is a schematic diagram of a chopper wheel and its marking method according to an embodiment of the present application. The slit of the chopper wheel is crucial to the resolution and image quality of backscattering imaging. The best theoretical slit width and shape can be obtained by simulation method. However, in the actual processing process, due to the material of the chopper wheel is usually high-density high-atomic-number alloy material, the actual processing precision is difficult to guarantee, and the width and shape of the five slits cannot be completely consistent, and the intersection position angle of the same slit and X-ray is also inconsistent. That is, there are the following problems:

[0032] (1) Inconsistent chopper wheel slit: In the direction parallel to the slit, which is called the horizontal direction, the inconsistency between the five slits leads to uneven brightness of each line when imaging, resulting in a horizontal striped image.

[0033] (2) X-ray intersection angle deviation: The intersection angle deviation of the same slit and the fan-shaped x-ray leads to different scattering signals of x-ray straight and oblique shooting, resulting in uneven brightness problem, which is manifested as the middle bright and both sides dark in the longitudinal direction on the image.

[0034] The present application effectively solves the problem of uneven brightness of images caused by inconsistent chopper wheel slit and X-ray intersection angle deviation in handheld backscatter X-ray imaging equipment by using double photoelectric switches to mark the chopper wheel, combined with weighted statistical average, vertical direction calibration and horizontal direction calibration, etc. The resolution and quality of the image are improved.

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] Embodiment 1

[0037] Please refer to Figure 1 , which is a flowchart of an image correction method of a handheld backscatter X-ray imaging device according to Embodiment 1 of the present application. The specific steps include:

[0038] S1: Obtain a scattering image by the handheld backscatter X-ray imaging device.

[0039] In this embodiment, a scattering body plug made of thick polyethylene block is usually used because it has strong scattering ability to X-rays. The scattering body plug is placed in the detection area of the handheld backscatter X-ray imaging device. Then the device is started, and the fan-shaped beam X-ray source is shot by the flying point X-ray spot through the high-speed rotating chopper wheel, and the detector panel synchronously receives the scattering signals of each flying point spot; the double photoelectric switches record the slit information of the chopper wheel to ensure that the image can be accurately grouped and calibrated subsequently; and the scattering signals received by the detector panel are processed to form a scattering image.

[0040] S2: Based on the grouping of the slits and the weighted statistical average of the imaging lines generated by the slits, a scattering mean signal is obtained.

[0041] In the embodiment, several imaging lines obtained by the same slit are combined as {a, b} two-dimensional data, where a is row and b is column. The data of different rows and same column are summed and divided by the number of rows to obtain the scattering mean value signals of different numbers. The scattering mean value signals are expressed as two-dimensional array {x, y}, where x is the number of slits and y is the number of data points of each slit.

[0042] For example, if the total number of scanning buses is 2000, 400 lines are generated by each slit, and the 400 lines obtained by the same slit are combined as {a, b} two-dimensional data, where a represents 400 rows and b represents 200 columns. The data of different rows and same column are summed and divided by 400. Five slits obtain five mean value arrays, i.e. two-dimensional array {x, y}, where x represents 5 slits and y represents 200 data points of each slit.

[0043] S3: Calibrating the scattering mean value signals in the vertical direction and the horizontal direction to obtain the vertical direction calibration coefficient and the horizontal direction correction coefficient.

[0044] In the embodiment, the step of calibrating the scattering mean value signals in the vertical direction and the horizontal direction to obtain the vertical direction calibration coefficient and the horizontal direction correction coefficient specifically includes steps S31 to S32, which are described in detail as follows.

[0045] S31: Using the least square method to perform quadratic curve fitting correction on the scattering mean value signals of the slits to obtain the vertical direction calibration coefficient.

[0046] First, the scattering data of each slit is processed, and the line data of the same slit is weighted and averaged according to the slit number to obtain the mean value single line data of each slit. The least square method is used to perform quadratic curve fitting on the single line data to obtain the target curve equation; wherein the target curve equation is the curve with the minimum sum of squares of the vertical distances of all data points to the curve. The specific expression is:

[0047]

[0048] wherein, the sum of squares of the vertical distances of all data points to the curve; is the actual intensity value of the i th data point; is the horizontal coordinate value of the single line data; is the fitting coefficient to be solved by the least square method.

[0049] After the curve fitting is completed, the correction vector is obtained, which is used as the vertical direction calibration compensation vector to convert the original data points into calibrated data points.

[0050] ​For example, the curve fitting correction is performed on the curve of single line data 200 points to make it reach the uniform state of vertical direction intensity, and a group of 200-dimensional correction vectors are recorded as the calibration compensation vectors (A1, A2...A 200 ). The specific fitting method is: through observation and theory, it is known that the single line curve presents the distribution of middle light and both sides dark, and the least square method is used for quadratic curve fitting. The single line data of 200 points {y1, y2...y 200} are converted into 200 data points, x is the horizontal coordinate value from 1 to 200: (1, y1), (2, y2), (200, y 200 ); the curve equation is assumed to be y= aX 2 +bx+c, and the curve equation found by fitting can make the sum of squares of the vertical distance of all data points from the curve minimum.

[0051] In order to obtain the minimum value, the partial derivatives of S with respect to a, b and c are calculated, and they are set to zero. Through the linear equation set, the values of a, b and c are obtained. Specifically:

[0052] The partial derivatives are:

[0053] ,

[0054] ,

[0055] ,

[0056] Simplify the equation to obtain:

[0057] ,

[0058] ,

[0059] ,

[0060] The above is a linear equation set containing three unknowns a, b and c, which is solved by matrix inversion or using other linear algebra methods to obtain the coefficients a, b and c. Through vertical correction, this quadratic curve is converted into a horizontal straight line tangent to it at the vertex, and the vertex coordinates are , so the conversion coefficient of each point to the horizontal line is , that is, all points are multiplied by the coefficient to complete the vertical calibration.

[0061] S32: The weighted sum of the scattering mean value signals after vertical direction calibration is averaged to obtain the horizontal calibration coefficient.

[0062] The calibration emphasis in horizontal direction is to compensate the machining error of the slit to ensure the consistency of light flux. The specific compensation method is to normalize the signal of the maximum value slit after weighted summation and averaging of the scattering average signal after vertical calibration, and to obtain the normalization coefficient; and to calibrate the signal of each slit in horizontal direction according to the normalization coefficient.

[0063] For example, the 200 point data of five slits are weighted summed and averaged; there are 200 points in each of the five slits, the first 200 points are averaged as S1, the second as S2, and so on.

[0064] The obtained data are {S1, S2, S3, S4, S5}, which are normalized to the maximum value S1, and then five normalization coefficients {x1, x2, x3, x4, x5} are obtained, x1=1, x2=(S1 / S2), x3=S1 / S3,..., x5=S1 / S5.

[0065] S4: image correction is performed on the scattering image according to the vertical direction calibration coefficient and the horizontal direction correction coefficient.

[0066] In the embodiment, after the device starts scanning, 200 data points of the first slit are obtained, denoted as {p1, p2,..., p200}, and the calibrated pixel value is {p1 *x1, p2 *x1,...p200 *x1}, the data points of the second slit {q1, q2,..., q200}, and the calibrated pixel value is {q1 *x2, q2 *x2...q200 *x2}. Similarly, the calibration of the whole scanning image is completed.

[0067] Please refer to Figure 3 , which is the imaging principle diagram of the handheld backscattering X-ray imaging device of embodiment 1. The fan-shaped area is denoted as the reflection coating for distinguishing the slit grouping diffuse reflection sensor, the chopper wheel is simultaneously installed with the light receiving switch for slit start and end judgment, and the diffuse reflection photoelectric switch is used for slit grouping signal output.

[0068] Further, an image correction method of a handheld backscatter X-ray imaging device is applied to a handheld backscatter X-ray imaging device, which comprises a fan-beam X-ray source, a chopper wheel, a double photoelectric switch, and a detector panel. The fan-beam X-ray source is used to generate X-rays. The chopper wheel is disposed in front of the fan-beam X-ray source and has a plurality of slits for modulating the X-rays. The double photoelectric switch is used to mark the chopper wheel, a first photoelectric switch is used to record the start of each imaging line, and a second photoelectric switch is used to encode the slits on the chopper wheel. The detector panel is used to receive backscatter X-ray signals.

[0069] In an embodiment, the handheld backscatter X-ray imaging device comprises a fan-beam X-ray source, a chopper wheel, a double photoelectric switch, and a detector panel. The fan-beam X-ray source generates flying spot X-ray spots through a high-speed rotating chopper wheel, which can penetrate objects and scatter inside them. The chopper wheel is a key component of the device, and has a plurality of slits for modulating the emission of X-rays. During rotation, the slits enable the X-rays to be sequentially irradiated on the object in the form of flying spots, thereby achieving scanning of the entire object. The detector panel is used to receive X-ray signals scattered by the object, and after conversion and processing, a backscatter perspective image of the object can be formed. In addition, a double photoelectric switch is used for chopper wheel marking. A direct photoelectric switch is used to record the start of a line, and a diffuse reflection switch is used to achieve encoding of the slits. Between two slits on the chopper wheel, a reflective coating is sprayed, and the slits after the reflective coating are numbered in the direction of rotation. After obtaining the encoding of the slits, the correction basis conditions for the inconsistency between the slits are obtained.

[0070] The handheld backscatter X-ray imaging device is suitable for various application scenarios, such as security checks in public places such as airports and stations, and monitoring of cargo transportation. Its portability and high-precision imaging capability enable the device to perform efficient and accurate detection work in various complex environments.

[0071] In summary, the image correction method of the handheld backscatter X-ray imaging device proposed in Embodiment 1 mainly corrects the problem of uneven brightness caused by inconsistent slits of the chopper wheel. First, a double photoelectric switch is used to mark the chopper wheel, one way to record the start of a line, and the other way to realize the coding of the slits and number the slits, providing basic conditions for subsequent correction. A scatter plug, such as a thick polyethylene block, is used to obtain a scatter image for image correction. Then, for each slit, multiple lines are weighted and statistically averaged according to the slit number to obtain the average scatter signal of different numbers. Then, vertical calibration is performed, the array of each slit is summed to obtain the average single-line data, and the least squares method is used for quadratic curve fitting; after completing the vertical calibration, the horizontal calibration is performed to compensate for the processing error of the slits and ensure the consistency of the light flux. Finally, after obtaining the vertical calibration coefficient and the horizontal correction coefficient, the calibration of the scan image can be started, thereby solving the problems of horizontal stripes and uneven brightness of the image.

[0072] Embodiment 2

[0073] Referring to Figure 4 , it is a structural schematic diagram of an image correction device of a handheld backscatter X-ray imaging device according to Embodiment 2 of the present application; the specific content includes:

[0074] An image acquisition and processing module: obtaining a scatter image through the handheld backscatter X-ray imaging device; based on the grouping of the slits and the weighted statistical average of the imaging lines generated by the slits, obtaining a scatter average signal;

[0075] A correction coefficient calculation module: performing vertical and horizontal calibration on the scatter average signal to obtain a vertical calibration coefficient and a horizontal correction coefficient;

[0076] An image correction module: correcting the scatter image according to the vertical calibration coefficient and the horizontal correction coefficient.

[0077] In this embodiment, the image correction device includes a handheld backscatter X-ray imaging device. In the handheld backscatter X-ray imaging device, the chopper wheel is installed on the handheld backscatter X-ray imaging device, and the photoelectric switch and the diffuse reflection photoelectric switch are installed; the chopper wheel is sprayed with a reflective coating, and the slits are numbered, and a scatter plug is used to obtain a scatter image. The image acquisition and processing module processes the image to obtain a scatter average signal. The correction coefficient calculation module performs vertical and horizontal calibration on the scatter average signal, and finally the image correction module completes the calibration of the entire scan image.

[0078] In summary, the image correction device of the embodiment 2 effectively improves the uneven brightness and horizontal stripe defects of the image, and improves the image quality. Meanwhile, the image correction device is suitable for various handheld backscatter X-ray imaging devices, and has wide applicability.

[0079] Embodiment 3

[0080] Referring to Figure 5 Fig. 3 is a structural schematic diagram of a handheld backscatter X-ray imaging device according to the embodiment 3 of the present application. The device 50 includes a processor 51 and a memory 52 coupled to the processor 51.

[0081] The memory 52 stores program instructions for implementing the image correction method of the handheld backscatter X-ray imaging device.

[0082] The processor 51 is configured to execute the program instructions stored in the memory 52 to implement the image correction of the handheld backscatter X-ray imaging device.

[0083] The processor 51 can also be referred to as a CPU (Central Processing Unit).

[0084] The processor 51 can be an integrated circuit chip with signal processing capability. The processor 51 can also be a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor.

[0085] Embodiment 4

[0086] Referring to Figure 6 Fig. 4 is a structural schematic diagram of a storage medium according to the embodiment 4 of the present application. The storage medium according to the embodiment of the present application stores a program file 61 capable of implementing all the methods described above. The program file 61 can be stored in the storage medium in the form of a software product, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods of the embodiments of the present application. The storage medium described above includes a U disk, a mobile hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk or an optical disk, and various media capable of storing program codes, or a computer, a server, a mobile phone, a tablet, etc.

[0087] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "includes" does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0088] The above description is merely that of the preferred embodiments of the present application, and modifications, equivalent structures and replacement of elements are possible within the scope of the present application, set out in the appended claims. Therefore, the technical scope of the present application should not be construed as being limited to the above described embodiments.

[0089] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, alternatives, and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the present application is defined by the appended claims and their equivalents.

[0090] Of course, the present application can have other various embodiments, and other embodiments obtained by those skilled in the art based on the present embodiments, without any creative effort, are within the scope of the present application.

Claims

1. An image correction method for a handheld backscatter X-ray imaging device, characterized in that, This invention pertains to a handheld backscattered X-ray imaging device, comprising: a fan-beam X-ray source, a chopper, dual photoelectric switches, and a detector panel; the fan-beam X-ray source generates X-rays; the chopper, positioned in front of the fan-beam X-ray source, has several slits for modulating X-rays; the dual photoelectric switches mark the chopper, with a first photoelectric switch recording the start of each imaging line and a second photoelectric switch encoding the slits on the chopper; the detector panel receives backscattered X-ray signals. The image correction method for a handheld backscatter X-ray imaging device includes: Scattered images are acquired using the handheld backscatter X-ray imaging device. The average scattering signal is obtained by grouping the slits and performing a weighted statistical average of several imaging lines generated by the slits. The scattering mean signal is calibrated in the vertical and horizontal directions to obtain the vertical calibration coefficient and the horizontal correction coefficient. The scattering image is corrected according to the vertical calibration coefficient and the horizontal correction coefficient. The step of calibrating the scattering mean signal in the vertical and horizontal directions to obtain the vertical calibration coefficient and the horizontal correction coefficient specifically includes the following steps: The mean scattering signal from the slit was corrected by quadratic curve fitting using the least squares method to obtain the vertical calibration coefficient. The horizontal calibration coefficient is obtained by weighted summation and averaging of the mean scattering signal after vertical calibration.

2. The image correction method for a handheld backscatter X-ray imaging device according to claim 1, characterized in that, The step of obtaining the average scattering signal based on grouping the slits and weighting and statistically averaging the several imaging lines generated by the slits specifically includes the following steps: Several imaging lines obtained from the same slit are combined into two-dimensional data {a, b}, where a is the row and b is the column; The average scattering signals with different numbers are obtained by summing the data in different rows but the same column and dividing by the number of rows. The average scattering signal is represented as a two-dimensional array {x, y}, where x is the number of slits and y is the number of data points per slit.

3. The image correction method for a handheld backscatter X-ray imaging device according to claim 1, characterized in that, The step of using the least squares method to perform quadratic curve fitting correction on the mean scattering signal of the slit to obtain the vertical calibration coefficient specifically includes the following steps: The scattering data of each slit is processed, and the data of several lines from the same slit are weighted and averaged according to the slit number to obtain the mean single-line data of each slit. The single-line data is fitted with a quadratic curve using the least squares method to obtain the target curve equation; wherein, the target curve equation is the curve whose sum of the squares of the vertical distances from all data points to the curve is minimized; After curve fitting is completed, a correction vector is obtained. This correction vector serves as a calibration compensation vector in the vertical direction, used to convert the original data points into calibrated data points.

4. The image correction method for a handheld backscatter X-ray imaging device according to claim 1, characterized in that, The step of weighted summation and averaging of the vertically calibrated mean scattering signal to obtain the horizontal calibration coefficient specifically includes the following steps: The weighted summation and average of the scattering mean signal after vertical calibration are normalized to the signal of the maximum value gap, and the normalization coefficient is obtained. The signal of each gap is calibrated horizontally based on the normalization coefficient.

5. An apparatus for image correction of a handheld backscatter X-ray imaging device according to any one of claims 1-4, characterized in that, include: Image acquisition and processing module: Acquires scattered images through the handheld backscatter X-ray imaging device; obtains the average scattered signal by weighted statistical averaging of the grouped slits and several imaging lines generated by the slits; Correction coefficient calculation module: performs vertical and horizontal calibration on the scattered mean signal to obtain the vertical calibration coefficient and the horizontal correction coefficient; Image correction module: Performs image correction on the scattered image based on the vertical calibration coefficient and the horizontal correction coefficient.

6. A handheld backscatter X-ray imaging device, characterized in that, The device includes a processor and a memory coupled to the processor, wherein the memory stores program instructions for implementing an image correction method for a handheld backscatter X-ray imaging device according to any one of claims 1-4; the processor is used to execute the program instructions stored in the memory to implement image correction for a handheld backscatter X-ray imaging device.

7. A storage medium, characterized in that, The device stores processor-executable program instructions for performing an image correction method for a handheld backscatter X-ray imaging device according to any one of claims 1-4.

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