CN108093186B - Automatic exposure control method and device based on slow emptying mode - Google Patents
Automatic exposure control method and device based on slow emptying mode Download PDFInfo
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- CN108093186B CN108093186B CN201711433921.7A CN201711433921A CN108093186B CN 108093186 B CN108093186 B CN 108093186B CN 201711433921 A CN201711433921 A CN 201711433921A CN 108093186 B CN108093186 B CN 108093186B
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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Abstract
The invention provides an automatic exposure control method based on a slow emptying mode, which is used in an automatic exposure detection mode of a detector and at least comprises the following steps: the detector executes emptying action in an idle state, and when the scanning time of each line is longer than the response time of exposure of an internal sensor during emptying, the detector loses at most one line of X-ray dose; when the exposure is detected to start, stopping the emptying action and waiting for the exposure to end; and when the exposure is detected to be finished, starting an image acquisition action, wherein the scanning time of each line during image acquisition is shorter than the scanning time of each line during emptying, and controlling the time for scanning the whole image to be in the ms level. The automatic exposure control method based on the slow emptying mode controls the transition zone in one line, can effectively correct the transition zone in a bad line correction mode, and does not increase the time of an exposure upper image compared with the simple increase of the line scanning time.
Description
Technical Field
The invention relates to the technical field of digital X-ray flat panel detectors, in particular to an automatic exposure control method and device based on a slow emptying mode in an X-ray flat panel detector.
Background
After the exposure of the X-ray equipment, the digital X-ray flat panel detector collects the signals remained on the panel, thereby achieving the effect of perspective imaging of the object. Therefore, in the imaging process, the acquisition action of the flat panel detector and the exposure action of the X-ray device need to be synchronized, otherwise, the problem that the exposure of the X-ray device conflicts with the acquisition action of the flat panel detector may occur, and an abnormal image may occur at this time.
In addition, the flat panel detector needs to clear residual signals existing in the flat panel detector before exposure of the X-ray equipment, and the acquired image does not contain other signals and only contains exposure signals of the X-ray equipment.
Therefore, the one-time complete exposure synchronous acquisition process is as follows: clearing a flat panel detector, exposing an X-ray device and collecting by the flat panel detector.
The common automatic exposure detection is that the flat panel detector is always in an emptying action in an idle state, the emptying action of the flat panel detector is stopped after the internal sensor senses that the X-ray equipment emits X-rays, and the image acquisition action is started again after the exposure is finished. However, when the light output amount of the X-ray device is low, the response time of the internal sensor increases, and when the response time exceeds the time for clearing one line of the flat panel detector, a transition zone with a low gray value is generated in a corresponding line on an acquired image after exposure because the X-ray signal is cleared, and if the response time of the internal sensor increases, the width of the transition zone also increases correspondingly, and the existence of the transition zone affects the image quality.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic exposure control method and apparatus based on slow emptying method, which is used to solve the transition zone caused by the difference between the response time of the sensor inside the flat panel detector and the emptying time of each row of the flat panel detector, and the image correction problem caused thereby.
In order to achieve the purpose, the invention adopts the following scheme: an automatic exposure control method based on a slow emptying mode is used for a detector in an automatic exposure detection mode, and the automatic exposure control method at least comprises the following steps: the detector executes emptying action in an idle state, and when the scanning time of each line is longer than the response time of exposure of an internal sensor during emptying, the detector loses at most one line of X-ray dose; when the exposure is detected to start, stopping the emptying action and waiting for the exposure to end; and when the end of exposure is detected, starting an image acquisition action.
In an embodiment of the present invention, the scanning time of each line during image acquisition is shorter than the scanning time of each line during emptying, and the time for scanning an entire image is controlled to be in the order of ms.
In an embodiment of the present invention, the method further includes a step of performing background correction on the acquired image.
In an embodiment of the present invention, the background correction of the acquired image comprises the following steps: calculating the time between emptying and collecting of a line on an exposure line; calculating the time from emptying to collecting of the last line; measuring the leakage current value of each pixel, and calculating a background value according to the linear relation between the leakage current and time; and carrying out background correction on the acquired image according to the background value.
In an embodiment of the present invention, the scanning time of each row when the detector is cleared is controlled to be between 1ms and 10 ms.
In an embodiment of the present invention, the scanning time of each line when the detector collects information is controlled to be between 100us and 200 us.
In an embodiment of the present invention, the method further includes the step of splicing N lines into a complete bright-field image by scanning the exposure line by line, where N is a positive integer, and N is the number of lines of the flat panel detector.
The present invention also provides an automatic exposure control apparatus comprising an optical signal generator for emitting an optical signal and a detector in an automatic exposure detection mode, the detector comprising at least: the detector panel is used for receiving the optical signal emitted by the optical signal generator, converting the optical signal into a charge signal and storing the charge signal; the sensor is connected with the detector panel and used for sensing exposure information; the control circuit is used for clearing residual signals in the detector panel in an idle state, wherein the scanning time of each row is longer than the exposure response time of the inductor when the control circuit is cleared, and the control circuit is also used for stopping clearing action after receiving an exposure signal sent by the inductor; the control circuit is also used for starting image acquisition after receiving exposure end information fed back by the sensor.
In an embodiment of the invention, the scan time of each row when the control circuit is cleared ranges from 1ms to 10 ms.
In an embodiment of the invention, the scanning time of each line when the control circuit collects the information is in a range of 100 to 200 us.
In an embodiment of the present invention, the display device further includes an image display module, configured to display image information acquired by the control circuit.
As described above, the automatic exposure control method and apparatus based on the slow purging mode of the present invention have the following advantages:
1. controlling the transition band within one line by controlling the scanning time of each line in the clearing process to be larger than the response time of the exposure of an internal inductor, and effectively correcting the transition band in a bad line correction mode;
2. the scanning time of each line is controlled to be smaller than that of the empty line during collection, the scanning time of a whole image is guaranteed to be in the ms level, and the time of image exposure is not increased compared with the simple increase of the line scanning time.
Drawings
FIG. 1 is a timing diagram illustrating exposure of a detector according to a first embodiment of the present invention.
Fig. 2 is a time distribution diagram of each line scanning of the detector in the first embodiment of the automatic exposure control method based on the slow purging method according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and although the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in the actual implementation, the type, quantity and proportion of the components in the actual implementation can be changed freely, and the layout of the components can be more complicated.
Example one
The invention provides an automatic exposure control method based on a slow emptying mode, which is used in an automatic exposure detection mode of a detector and at least comprises the following steps:
the detector executes emptying action in an idle state, and the scanning time of each line during emptying is longer than the response time of exposure of an internal sensor (under any X-ray dose), so that the detector loses at most one line of X-ray dose;
when the exposure is detected to start, stopping the emptying action and waiting for the exposure to end;
when the exposure is detected to be finished, starting an image acquisition action, wherein the scanning time of each line during image acquisition is shorter than the scanning time of each line during emptying, and controlling the time for scanning a whole image to be in the ms level, otherwise, the image acquisition time of the detector is influenced.
Referring to fig. 1, a timing diagram of the exposure of the detector in the automatic exposure control method based on the slow emptying mode of the present invention is shown, which describes an idle state of the flat panel detector, the detector is in the emptying state, when n-2 rows are scanned, the X-ray device is exposed, but the sensor inside the detector does not immediately output a trigger signal, but a certain response time T elapses, where the range of T is generally between 300us and 10ms, when n rows are reached, the trigger signal is output, and at this time, the detector closes the row scanning action, and waits for the end of exposure.
Referring to fig. 2, a time distribution of each line scanning in the detector exposure process is described, and when the detector is in an empty state, the scanning time of each line is t 1; stopping the emptying action when the detector detects exposure in the nth row; and the exposure time is t3, wherein after the exposure is finished, the detector starts to collect from the nth line, the collection is executed according to t2 time of each line, and N lines are scanned line by line and spliced into a complete bright field image, wherein N is a positive integer and is the line number of the flat panel detector.
Since the clear line scan time t1 is different from the acquired line scan time t2, so that the time from clearing to acquisition is different between the upper half of the pixels of the exposure row of the flat panel detector and the lower half of the pixels of the exposure row, the generated diode leakage current is different, and particularly, the difference between the upper row of the exposure row and the lower row of the exposure row is the largest at the position of the exposure row, so the leakage current influence caused by the above different time factors needs to be fully considered in the background correction.
Since the leakage current is in a linear relationship with time within a certain range, assuming that the exposure time of the X-ray device is t3, when the internal sensor generates an exposure signal, the flat panel detector is emptying N rows, and the number of the flat panel detector is N rows, the background correction step for the acquired image includes the following steps:
the time between clearing and capturing of a line on an exposure line is calculated as: t3+ (N-N) t 2;
the time interval from empty to acquisition of the last line was calculated as: n × t1+ t 3;
measuring a leakage current value I of each pixel, and calculating a background value (I x t) according to a linear relation between the leakage current and time;
and carrying out background correction on the acquired image according to the background value.
In this embodiment, the scan time of each line when the detector is cleared is controlled to be between 1ms and 10 ms.
In this embodiment, the scanning time of each line when the detector acquires information is controlled between 100us and 200 us.
Example two
The present invention also provides an automatic exposure control apparatus comprising an optical signal generator for emitting an optical signal and a detector in an automatic exposure detection mode, the detector comprising at least:
the detector panel is used for receiving the optical signal emitted by the optical signal generator, converting the optical signal into a charge signal and storing the charge signal;
the sensor is connected with the detector panel and used for sensing exposure information;
the control circuit is used for clearing residual signals in the detector panel in an idle state, wherein the scanning time of each row is longer than the exposure response time of the inductor when the control circuit is cleared, and the control circuit is also used for stopping clearing action after receiving an exposure signal sent by the inductor; the control circuit is also used for starting an image collecting action after receiving exposure end information fed back by the sensor, and the scanning time of each line when the control circuit collects the image is shorter than the scanning time of each line when the control circuit is emptied, and controlling the time for scanning the whole image to be in the ms level.
In this embodiment, the scanning time of each row when the control circuit is cleared is controlled to be between 1ms and 10 ms.
In the embodiment, the scanning time of each line when the control circuit collects information is controlled to be between 100 and 200 us.
In this embodiment, the display device further includes an image display module for presenting the image information collected by the control circuit.
In this embodiment, the detector is an X-ray flat panel detector.
In this embodiment, the optical signal generator is a high voltage generator and a bulb.
In summary, in the automatic exposure control method based on the slow emptying mode, the scanning time of each row during emptying is set to be longer than the response time of the exposure of the internal sensor, so that the transition zone is controlled in one row, and effective correction is performed in a bad line correction mode; the scanning time of each line is controlled to be smaller than that of the empty line during collection, the scanning time of a whole image is guaranteed to be in the ms level, and the time of image exposure is not increased compared with the simple increase of the line scanning time. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An automatic exposure control method based on a slow emptying mode is used for a detector in an automatic exposure detection mode, and is characterized by at least comprising the following steps:
the detector executes emptying action in an idle state, and when the scanning time of each line is longer than the response time of exposure of an internal sensor during emptying, the detector loses at most one line of X-ray dose;
when the exposure is detected to start, stopping the emptying action and waiting for the exposure to end;
when the exposure is detected to be finished, starting an image acquisition action;
and the scanning time of each line during image acquisition is less than that of each line during emptying, and the time for scanning the whole image is controlled to be in the ms level.
2. The method of claim 1, further comprising background correcting the captured image.
3. The method of claim 2, wherein the background correction of the captured image comprises:
calculating the time between emptying and collecting of a line on an exposure line;
calculating the time from emptying to collecting of the last line;
measuring the leakage current value of each pixel, and calculating a background value according to the linear relation between the leakage current and time;
and carrying out background correction on the acquired image according to the background value.
4. The automatic exposure control method based on the slow emptying mode according to claim 1, wherein the scanning time of each line during the emptying of the detector is controlled between 1ms and 10 ms.
5. The automatic exposure control method based on the slow emptying mode as claimed in claim 1, wherein the scanning time of each line when the detector collects information is controlled between 100-200 us.
6. The automatic exposure control method according to claim 1, further comprising the step of stitching N lines, where N is a positive integer and N is the number of lines of the flat panel detector, line by line starting from the exposure line to form a complete bright field image.
7. An automatic exposure control apparatus comprising an optical signal generator for emitting an optical signal and a detector in an automatic exposure detection mode, characterized in that the detector comprises at least:
the detector panel is used for receiving the optical signal emitted by the optical signal generator, converting the optical signal into a charge signal and storing the charge signal;
the sensor is connected with the detector panel and used for sensing exposure information;
the control circuit is used for clearing residual signals in the detector panel in an idle state, wherein the scanning time of each row is longer than the exposure response time of the inductor when the control circuit is cleared, and the control circuit is also used for stopping clearing action after receiving an exposure signal sent by the inductor; the control circuit is also used for starting an image collecting action after receiving exposure end information fed back by the sensor, the scanning time of each line when the control circuit collects the image is shorter than the scanning time of each line when the control circuit is emptied, and the time for scanning the whole image is controlled to be in the ms level.
8. The automatic exposure control device of claim 7, wherein the scan time for each row when the control circuit is cleared ranges from 1ms to 10 ms.
9. The automatic exposure control device of claim 7, wherein the control circuit collects information for a scan time of each line in a range of 100us to 200 us.
10. The automatic exposure control device of claim 7, further comprising an image display module for presenting image information collected by the control circuit.
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| CN110933256B (en) * | 2019-12-03 | 2022-05-03 | 上海奕瑞光电子科技股份有限公司 | Method and device for correcting image dark field leakage current, electronic terminal and storage medium |
| CN111198396B (en) * | 2019-12-23 | 2023-06-06 | 德润特医疗科技（武汉）有限公司 | AED rapid detection method |
| CN112885856B (en) * | 2021-01-15 | 2023-02-03 | 上海品臻影像科技有限公司 | Indirect X-ray flat panel detector and exposure synchronization method thereof |
| CN113301262B (en) * | 2021-04-16 | 2023-05-02 | 维沃移动通信（杭州）有限公司 | Pixel processing circuit, method and device and electronic equipment |
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