CN104463831A - Method for repairing X-ray flat panel detector image bad line - Google Patents
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- 230000005856 abnormality Effects 0.000 claims description 14
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- 238000001914 filtration Methods 0.000 claims description 9
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- 230000001419 dependent effect Effects 0.000 claims description 3
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- 238000003745 diagnosis Methods 0.000 abstract description 5
- 230000000717 retained effect Effects 0.000 abstract 1
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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Abstract
The invention discloses a method for repairing an X-ray flat panel detector image bad line. The method includes the steps of calculating the anomaly degree of a bad line area in an X-ray flat panel detector image; when the anomaly degree is larger than a preset first threshold value, further judging whether the anomaly degree is larger than a second threshold value or not; if the anomaly degree is larger than the second threshold value, ignoring pixel values of pixel points in the X-ray flat panel detector image bad line, and processing the image with the interpolation smoothness method in the bad line vertical direction through non-damage pixel areas around bad line coordinates to obtain a final repaired image; if the anomaly degree is smaller than or equal to the second threshold value, further detecting obvious edges, parallel to the bad line direction, in the detection bad line, conducting curve fitting on the edges, and finally obtaining the repaired image through interpolation and smoothness processing. By means of the method, parameters of an X-ray flat panel detector do not need to be modified, effective pixel values of the bad line area are sufficiently used, the better repairing effect is achieved, effective diagnostic messages of the X-ray image are retained, and the method is of positive significance in improving diagnosis.
Description
Technical field
The present invention relates to Medical Image Processing, especially relate to a kind of method for repairing and mending of x-ray flat panel detector image bad line.
Background technology
Current x-ray flat panel detector film imaging than before has many good qualities, as high in spatial resolution, space distortion is little, have last handling process etc. flexibly.But detector is due to complex manufacturing technology, when dispatching from the factory, in transportation or after using a period of time, there will be the defects such as abnormal bright spot, dim spot and bad point bad line.Current producer carries bad point and program corrected by bad line, compares bad point and corrects program, and bad line is corrected program and more easily occurred repairing not enough vestige because of bad line width and bad line change severe degree.At this moment need a kind of method to carry out secondary reparation, eliminate or desalinate bad stria mark.
Chinese patent CN200510026786.5 proposes a kind of bearing calibration of X ray digital imagery, the method is according to the physics analysis to imaging chain, utilizes mathematical model to carry out drift correction to digital flat panel, and spatial heterogeneity corrects, after bad point corrects, the digital picture of complete X-ray information.But the method can only correcting image bad point and need to change X-ray flat panel detector.
Chinese patent application CN201010135142.0 proposes a kind of method and device thereof processing x-ray flat panel detector image bad line, first the method detects the position of x-ray flat panel detector bad line, then make the view data calculation compensation amount of the non-bad line image pixel damaged in the neighborhood of line, thus repair the bad line of image.The method have ignored the valid pixel value in bad line, causes repairing the pixel of result images in bad line region and manufactures for artificial, lose diagnostic significance.
Summary of the invention
The present invention proposes a kind of method for repairing and mending of x-ray flat panel detector image bad line, the object reaching and thoroughly remove bad line is repaired to bad line region again in the basis of producer's correction result, adopts simple interpolation method image bad line to be processed to the technical matters causing repairing effect not good to solve prior art.
The present invention adopts following technical scheme to realize: a kind of method for repairing and mending of x-ray flat panel detector image bad line, and it comprises step:
The abnormality degree diffVal in bad line region in A, calculating x-ray flat panel detector image;
B, when abnormality degree diffVal is greater than default first threshold T, judge whether abnormality degree diffVal is greater than default Second Threshold t, if so, proceeds to step C, otherwise proceeds to step D further;
C, ignore the pixel value of each pixel in x-ray flat panel detector image bad line, by the non-damaging pixel region around bad line coordinates, use interpolation smoothing method to process image in bad line vertical direction, obtain final repairing image f
(x, y);
D, detect obvious edge, bad line bad line direction, edge carries out curve fitting, and obtains final repairing image f through interpolation and smoothing processing
(x, y);
Wherein, the computing formula of first threshold T is
the computing formula of Second Threshold t is
i=1,2, L and N, N be the number of pixel on bad line direction, the maximum gradation value that Max (GrayScale) is x-ray flat panel detector image, X
ifor the pixel value of pixel each on bad line,
with
adjacent with the bad line left and right sides two intact pixel lines respectively.
Wherein, have the bad line that L bar runs through dull and stereotyped up and down in x-ray flat panel detector image, bad line coordinates is Def
l, wherein l=1 ..., L, then the computing formula of abnormality degree diffVal is as follows:
P=0,1 ... and L-1.
Wherein, the computing formula using interpolation smoothing method to process image in step C is as follows: f
(x, y)=cofI
(x ,-1)+ (1-cof) I
(x, L+1), x=1,2 ... R; Y=1 ..., l;
p=0,1 ... and L-1, I
(x ,-1)represent near each some I on the intact line on the left of bad line
(x, L+1)represent near each point on intact line adjacent on the right side of bad line, R represents the length of bad line, and y is the value from 1 to current bad line l, l=1 ..., L.
Wherein, the step detecting obvious edge, bad line bad line direction comprises:
Gaussian smoothing template is used to carry out filtering;
Use Sobel vertical direction Filtering Template to carry out filtering detection to obtain in bad line region, being parallel to obvious edge, bad line direction, and record the coordinate (x of these marginal points
j, y
j).
Wherein, the step that edge carries out curve fitting comprises: the marginal point coordinate obtained is used quadratic polynomial ax
2+ bx+c=y carries out curve fitting, and a is 2 term coefficient, and b is Monomial coefficient, and c is constant term, and x is independent variable is also the coordinate of going in the picture, the y row coordinate that to be dependent variable be also in the picture.
Wherein, in step D, the step of interpolation processing comprises:
Every bit (x in bad line region inner margin
j, y
j) ∈ ax
2the normal direction of+bx+c
Upwards use
with
interior pixel value (x
0, y
0) ∈ Yr
iuYl
icarry out interpolation with the pixel point value of bad line originally on curvilinear equation, interpolation method is
y=0,1 ... and L-1, wherein, t is two default subthresholds, and I is the pixel value of x-ray flat panel detector image, and k is control coefrficient.
Wherein, control coefrficient k is 1.
Compared with prior art, the present invention has following beneficial effect:
First the present invention remains the bad line rectification program that x-ray flat panel detector producer carries, on the basis that the bad line carried by producer program of correcting once is repaired image, select to carry out secondary reparation to image bad line by the abnormality degree basis that calculates bad line region, without the need to revising the parameter of x-ray flat panel detector, take full advantage of again the valid pixel value in bad line region, reach good repairing effect, and remain the efficient diagnosis information of x-ray image, to raising diagnosis, there is positive effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a preferred embodiment of the invention.
Fig. 2 A and Fig. 2 B is the leg DR image before and after bad line is repaired respectively.
Fig. 3 A and Fig. 3 B is the thoracic vertebrae DR image before and after bad line is repaired respectively.
Embodiment
The invention discloses a kind of restorative procedure of x-ray flat panel detector image bad line, abnormality degree by the bad line region of computed image after the dull and stereotyped rectification program of producer is evaluated reparation image itself, then still not good to repairing effect image carries out the bad line reparation of secondary, reaches the object thoroughly removing image bad line.
As shown in Figure 1, a preferred embodiment of the present invention comprises following performing step:
The abnormality degree in bad line region in step S1, calculating x-ray flat panel detector image.
Procedure sharing bad line coordinates corrected by the bad line that the present invention and x-ray flat panel detector producer carry, and suppose the bad line having L bar to run through dull and stereotyped up and down, bad line coordinates is Def
l, wherein l=1 ..., L.Calculate producer by bad line coordinates to carry rectification program and repair bad line pixel value in result images and the diversity factor between the pixel value of around non-bad line, diversity factor diffVal is the value between (0 ~ 1), and its account form is as follows:
Wherein, X
ifor the pixel value of pixel each on bad line,
with
adjacent with the bad line left and right sides two intact pixel lines.N is the number of pixel on bad line direction, and L is the number of bad pixel
p=0,1 ... and L-1.Step S2, by the diversity factor diffVal calculated with preset first threshold T compare, judge whether to need to carry out secondary reparation.If diversity factor is greater than first threshold T, judges to need to carry out secondary reparation, proceed to step S3, otherwise represent that not needing to carry out secondary repairs, flow process leaves it at that.
The computing formula of first threshold T:
wherein Max (GrayScale) maximum gradation value that is x-ray flat panel detector image, such as, x-ray flat panel detector image is 16 bit images, then in 16 bit images, Max (GrayScale) is 65535, and for example, x-ray flat panel detector image is 14 bit images, then in 14 bit images, Max (GrayScale) is 16383.
Step S3, judge whether diversity factor diffVal is greater than default Second Threshold t, if so, then proceeds to step S4 further; If the abnormality degree in bad line region is less than Second Threshold t, then illustrate that the bad line repair procedure that x-ray flat panel detector producer carries is still effective, just poor effect, then proceed to step S5 and further optimize reparation.
Wherein, the computing formula of Second Threshold t:
If the abnormality degree in bad line region is greater than Second Threshold t, illustrate that producer carries reparation result badly, namely once the bad line pixel of repairing in image can not continue to use, and needs to carry out secondary reparation.
Step S4, ignore the pixel value of each pixel in bad line, by the non-damaging pixel region around bad line coordinates, use interpolation smoothing method to process image in bad line vertical direction, obtain final repairing image f
(x, y).
f
(x,y)=cof·I
(x,-1)+(1-cof)·I
(x,L+1)，x=1,2,…R;y=1,…,l;
p=0,1 ... and L-1.Wherein I
(x ,-1)represent near each some I on the intact line on the left of bad line
(x, L+1)represent near each point on intact line adjacent on the right side of bad line.R represents bad line length, and y is the value from 1 to current bad line l.
Step S5, Gaussian smoothing template carries out filtering first to use size to be 3x3, re-uses Sobel vertical direction Filtering Template and carries out filtering and detect and obtain being parallel to obvious edge, bad line direction in bad line region, record the coordinate (x of these marginal points
j, y
j).
Step S6, use quadratic polynomial matching by the marginal point coordinate that obtains in previous step, fit curve equation is ax
2+ bx+c=y.Wherein, ax
2+ bx+c=y is a straight-line equation, and a is 2 term coefficient, and b is Monomial coefficient, and c is constant term, and x is independent variable is also the coordinate of going in the picture, the y row coordinate that to be dependent variable be also in the picture.
Step S7, in bad line region inner margin every bit (x
j, y
j) ∈ ax
2the normal direction of+bx+c
Upwards use
with
interior pixel value (x
0, y
0) ∈ Yr
iuYl
icarry out interpolation with the pixel point value of bad line originally on curvilinear equation, interpolation method is
y=0,1 ... and L-1.T is two default subthresholds, and I is original image pixel value, and k is control coefrficient, is 1 here.
Step S8, then other pixel values are made to damage line vertical direction smoothing method image is processed, the image f after being processed further
(x, y), wherein, the computation process of picture smooth treatment is as follows:
f
(x,y)=0.7·(cof·I
(x,-1)+(1-cof)·I
(x,L+1))+0.3·(I
(x,y))x=1,2,…R;y=1,…,l;
p=0,1,…,L-1。
Fig. 2 A is the leg DR image of leading astray line, and after technical scheme of the present invention is repaired, obtain image as shown in Figure 2 B, bad line is repaired.And for example, Fig. 3 A is the thoracic vertebrae DR image of leading astray line, and after technical scheme of the present invention is repaired, obtain image as shown in Figure 3 B, bad line is repaired.
To sum up, first the present invention remains the bad line rectification program that x-ray flat panel detector producer carries, on the basis that the bad line carried by producer program of correcting once is repaired image, premised on the abnormality degree calculating bad line region, select whether secondary reparation is carried out to image bad line, without the need to revising the parameter of x-ray flat panel detector, take full advantage of again the valid pixel value in bad line region, reach good repairing effect, and remain the efficient diagnosis information of x-ray image, to raising diagnosis, there is positive effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method for repairing and mending for x-ray flat panel detector image bad line, is characterized in that, comprises step:
The abnormality degree diffVal in bad line region in A, calculating x-ray flat panel detector image;
B, when abnormality degree diffVal is greater than default first threshold T, judge whether abnormality degree diffVal is greater than default Second Threshold t, if so, proceeds to step C, otherwise proceeds to step D further;
C, ignore the pixel value of each pixel in x-ray flat panel detector image bad line, by the non-damaging pixel region around bad line coordinates, use interpolation smoothing method to process image in bad line vertical direction, obtain final repairing image f
(x, y);
D, detect obvious edge, bad line bad line direction, edge carries out curve fitting, and obtains final repairing image f through interpolation and smoothing processing
(x, y);
Wherein, the computing formula of first threshold T is
the computing formula of Second Threshold t is
i=1,2, L and N, N be the number of pixel on bad line direction, the maximum gradation value that Max (GrayScale) is x-ray flat panel detector image, X
ifor the pixel value of pixel each on bad line,
with
adjacent with the bad line left and right sides two intact pixel lines respectively.
2. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 1, is characterized in that, have the bad line that L bar runs through dull and stereotyped up and down in x-ray flat panel detector image, bad line coordinates is Def
l, wherein l=1, L, L, then the computing formula of abnormality degree diffVal is as follows:
P=0,1, L and L-1.
3. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 1, it is characterized in that, the computing formula using interpolation smoothing method to process image in step C is as follows: f
(x, y)=cofI
(x ,-1)+ (1-cof) I
(x, L+1), x=1,2 ... R; Y=1 ..., l;
p=0,1 ... and L-1, I
(x ,-1)represent near each some I on the intact line on the left of bad line
(x, L+1)represent near each point on intact line adjacent on the right side of bad line, R represents the length of bad line, and y is the value from 1 to current bad line l, l=1 ..., L.
4. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 1, it is characterized in that, the step detecting obvious edge, bad line bad line direction comprises:
Gaussian smoothing template is used to carry out filtering;
Use Sobel vertical direction Filtering Template to carry out filtering detection to obtain in bad line region, being parallel to obvious edge, bad line direction, and record the coordinate (x of these marginal points
j, y
j).
5. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 1, it is characterized in that, the step that edge carries out curve fitting comprises: the marginal point coordinate obtained is used quadratic polynomial ax
2+ bx+c=y carries out curve fitting, and a is 2 term coefficient, and b is Monomial coefficient, and c is constant term, the x row-coordinate that to be independent variable be also in the picture, the y row coordinate that to be dependent variable be also in the picture.
6. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 5, it is characterized in that, in step D, the step of interpolation processing comprises:
Every bit (x in bad line region inner margin
j, y
j) ∈ ax
2the normal direction of+bx+c
Upwards use
with
interior pixel value (x
0, y
0) ∈ Yr
iuYl
icarry out interpolation with the pixel point value of bad line originally on curvilinear equation, interpolation method is
y=0,1 ... and L-1, wherein, t is two default subthresholds, and I is the pixel value of x-ray flat panel detector image, and k is control coefrficient.
7. the method for repairing and mending of a kind of x-ray flat panel detector image bad line according to claim 6, it is characterized in that, control coefrficient k is 1.
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| CN107661115A (en) * | 2017-10-30 | 2018-02-06 | 上海联影医疗科技有限公司 | System and method for positron emission computerized tomography |
| CN107818556A (en) * | 2016-08-31 | 2018-03-20 | 江苏邦融微电子有限公司 | Bad the line Autonomous test and self-repair method of capacitance type fingerprint acquisition system |
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| CN104463831B (en) | 2019-07-09 |
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