Method and system for nonlinearly adjusting image brightness
A technology of image brightness and non-linearity, which is applied in the field of digital medical image processing, can solve problems such as the difference in the effect of the output image, the brightness of the image does not meet the requirements, and affects the diagnosis, etc., to achieve stable image effects, reduce the impact, and facilitate removal Effect
Active Publication Date: 2017-06-09
SHENZHEN ANGELL TECH
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When in use, due to insufficient selection of the shooting dose, the brightness of the image does not meet the requirements, resulting in a far difference between the output image effect and the expected effect, which affects the diagnosis
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[0028] In order to describe the technical content, achieved goals and effects of the present invention in detail, the following descriptions will be made in conjunction with the embodiments and accompanying drawings.
[0029] The most critical idea of the present invention is: this scheme first calculates the average brightness value of the image to be tested and compares whether it is the same with the average brightness value of the standard, and performs logarithmic transformation on the image to be tested according to different results, so that the image to be tested can be detected when the brightness is insufficient. Under certain circumstances, better image processing effect is maintained.
[0030] Please refer to figure 1 , a method for non-linearly adjusting image brightness, comprising the steps of:
[0031] S01. Initialize a plurality of body position image samples, use the brightness mean value of all pixels in the preset area of each body position image sampl...
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The invention provides a method and system for nonlinearly adjusting image brightness. The method includes the following steps that S01, after initialization is conducted, a mapping table of a position and brightness control parameters is set up; S02, the information of the position to be tested and data of an image to be tested are input; S03, the brightness mean value of all pixel points in a target area of the image to be tested is calculated; S04, a standard brightness mean value of the image to be tested is obtained according to the input information of the position to be tested and the mapping table obtained through initialization; S05, whether the brightness mean value of the image to be tested is equal to the standard brightness mean value or not is judged, if not, the step S06 is executed, and if yes, the step S07 is executed; S06, logarithmic transformation is conducted on all the pixel points in the target area of the image to be tested, and postprocessing is conducted on the image to be tested after logarithmic transformation; S07, the image to be tested is output. According to the method and system for nonlinearly adjusting the image brightness, in the situation that the brightness of the image to be tested is insufficient, the good image processing effect is kept, and the rate of repeated photographing is reduced.
Description
technical field [0001] The invention relates to the field of digital medical image processing, in particular to a method and system for non-linearly adjusting image brightness. Background technique [0002] In general DR image processing, it is generally divided into two main processes: pre-processing and post-processing. The functions of pre-processing mainly include non-uniform correction and dead point correction, etc., and the functions of post-processing are contrast enhancement and detail enhancement. Since the post-processing method is fixed, the processing parameters are manually set in advance, and will not be adjusted adaptively according to the change of image brightness. Brightness has a lot to do with it. When in use, due to insufficient selection of the shooting dose, the brightness of the image does not meet the requirements, resulting in a far difference between the output image effect and the expected effect, which affects the diagnosis. Contents of the i...
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IPC IPC(8): H04N5/232H04N17/00
Inventor 叶超李学军张水兴杜静
Owner SHENZHEN ANGELL TECH