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A method and system for estimating a point spread function

A point spread function and line spread function technology, applied in the field of point spread function estimation methods and systems, can solve the problems of low degree of automation and slow execution speed, and achieve the effect of improving clarity

Active Publication Date: 2018-12-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a point spread function estimation method and system to solve the technical problems of low automation and slow execution speed of the point spread function estimation method in the prior art

Method used

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  • A method and system for estimating a point spread function
  • A method and system for estimating a point spread function
  • A method and system for estimating a point spread function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 of the present invention provides a method for estimating the point spread function using a plurality of rectangular blocks of uniform plate-shaped materials with substantially the same size and different mass thicknesses. For details, see figure 2 ,include:

[0058] Step 201: Use a scanning device to scan and image a plurality of rectangular blocks of the same size and closely arranged.

[0059] In this step, multiple rectangular blocks composed of iron and polyethylene material blocks of different mass thicknesses are used for scanning imaging, and the scanned image is as image 3 Shown. The size of each material block is 200mm×200mm, and the first row is the mass thickness of 6g / cm. 2 , 8g / cm 2 , 10g / cm 2 Iron material; the first in the second row is the mass thickness of 4g / cm 2 The iron material, the second and the third are respectively with a mass thickness of 2g / cm 2 And 4g / cm 2 Polyethylene material; the first in the third row is the mass thickness of 3...

Embodiment 2

[0068] See Picture 10 The method for estimating the point spread function in Embodiment 2 of the present invention is basically the same as that in Embodiment 1, wherein, before step 1004 (corresponding to step 203 in embodiment 1 of the present invention), it further includes:

[0069] Step 1003: Average the standard deviation parameters of multiple line spread functions in the same direction, and combine the material and mass thickness of the rectangular block to obtain the average standard deviation parameter in this direction.

[0070] In this step, after performing the line spread function calculation and standard deviation parameter fitting of the foregoing steps on all the 6 internal vertical block boundaries and the 6 internal horizontal block boundaries in the first embodiment of the present invention, the standard deviations in the two directions can be respectively determined. The parameters are averaged to obtain the average standard deviation parameters in the horizont...

Embodiment 3

[0073] Embodiment 3 of the present invention provides a point spread function estimation system, see Picture 11 ,include:

[0074] The imaging unit 1101 is used for scanning and imaging a plurality of rectangular blocks of the same size and closely arranged by a scanning device. The materials of the plurality of rectangular blocks are different and / or the quality and thickness are different, and the incident angle of the rays during scanning and imaging is different from The scanning direction is vertical, and the incident angle of the rays is vertical to the closely arranged surfaces of the plurality of rectangular blocks;

[0075] The parameter obtaining unit 1102 is configured to obtain the line spread function along the length and width of the rectangular block according to the scanned image, and obtain the standard deviation parameters of the line spread function respectively;

[0076] The estimation unit 1103 is configured to combine the standard deviation parameters of the tw...

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Abstract

The present invention provides a method and system for estimating a point spread function. The method includes: using a scanning device to scan and image a plurality of rectangular blocks of the same size and closely arranged. The manufacturing materials of the plurality of rectangular blocks are different and / or their quality The thickness is different, wherein the incident angle of the ray is perpendicular to the scanning direction during scanning imaging, and the incident angle of the ray is perpendicular to the closely arranged surfaces of the plurality of rectangular blocks; the length and width along the rectangular blocks are obtained according to the scanned image line spread functions in two directions, and obtain standard deviation parameters of the line spread functions respectively; combine the standard deviation parameters in the two directions to obtain parameters of a two-dimensional point spread function, so as to estimate the point spread function. The invention has high degree of automation and fast execution speed.

Description

Technical field [0001] The invention relates to the technical field of perspective imaging, in particular to a point spread function estimation method and system. Background technique [0002] In the fluoroscopic imaging system, the image blurring caused by the movement of the scanning device and the crosstalk of the detector often occurs, which has a certain impact on the visual effect of the image and the inspector's observation of the image content and the discovery of suspicious areas in the image. The image quality degradation of the system can be approximated as a point spread function (PSF, Point Spreading Function) convolution of the image. If the point spread function of the system is known, the image can be deblurred by some image restoration techniques to obtain a clear image. In addition, the quantitative description of the point spread function itself can be used as an important indicator to evaluate the imaging quality of the system, and its in-depth analysis can a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/15
CPCG06T7/77G06T7/44G06T7/00G06T2207/20021G06T2207/30168G06T2207/10116G06T2207/20076G06T5/73
Inventor 康克军陈志强李元景张丽赵自然刘耀红顾建平王志明
Owner TSINGHUA UNIV
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