Digital radiography (DR) contrast balancing method and system

Abstract

The invention provides a digital radiography (DR) contrast balancing method. The DR contrast balancing method includes inputting image data and body position information; setting the size of a local area according to the body position information; selecting a rectangular area using each pixel point of the image data, wherein the size of the rectangular area is based on the size of the local area; calculating a pixel grey level maximum value and a pixel grey level minimum value of the rectangular area to obtain a first grey level maximum value image and a first grey level minimum value image; subjecting the first grey level maximum value image and the first grey level minimum value image to filter processing to obtain a second grey level maximum value image and a second grey level minimum value image; determining a corresponding histogram range of each pixel point of the input initial image data according to the corresponding second grey level maximum value image and the second grey level minimum value image; subjecting each pixel point to histogram linear extension processing according to the corresponding histogram ranges to obtain contrast balanced image data. According to the DR contrast balancing method, the problem that DR images greatly differ in brightness and are difficult to clearly display information of different tissue is solved.

Description

technical field [0001] The invention relates to the field of digital medical image processing, in particular to a method and system for equalizing the contrast of DR images. Background technique [0002] In the actual application of the existing DR image processing technology, due to the difference in the thickness of different tissues of the human body and the difference in the absorption rate of X-rays by different physiques of the human body, the brightness and darkness of the obtained DR images are quite different, and it is difficult to image the human body. The characteristic information of different organizations is displayed clearly at the same time. When doctors observe and diagnose in the later stage, they need to adjust and observe different areas of the image by manual means such as adjusting the window width and window technology, which not only affects the efficiency of diagnosis, but also consumes unnecessary time. The existing technology generally adopts the...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method and system for equalizing the contrast of DR images, which solves the problem that existing DR images have large differences in brightness and darkness, and it is difficult to clearly display the information of different tissues at the same time, so multi-frequency processing is adopted. The method is easy to lose the information of natural grayscale changes

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