Cutting method of digital radiography (DR) image
An image and image technology, applied in the field of medical image processing, can solve the problems of low image processing efficiency, large amount of calculation, inaccurate edge detection, etc., and achieve the effect of reducing calculation amount, improving accuracy, and improving cutting efficiency
Inactive Publication Date: 2014-04-09
SHENZHEN LANDWIND IND
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[0006] The present invention proposes a DR image cropping method to solve the current technical problems of inaccurate edge detection and large amount of computation that lead to low image processing efficiency in DR image cropping
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[0033] The present invention first extracts the edge of the image in the low-resolution image by down-sampling the read-in DR image; then, according to the characteristics of the DR image, preliminarily determines the possible boundary of the light beam device; The final beam boundary is determined by the degree local features, and finally the DR image is cropped by using the detected boundary coordinates to obtain the cropped image.
[0034] Such as figure 1 As shown, a preferred embodiment of the present invention includes the following implementation steps:
[0035] Step S1, read in the original DR image M, and down-sample the DR image M to obtain an image B.
[0036] The purpose of downsampling is to reduce the resolution of the DR image, which can reduce the calculation amount of subsequent image processing at low resolution.
[0037] The original DR image M is down-sampled, assuming that the image M may have a size of 4096×4096 or 2048×2048. Regardless of the resoluti...
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The invention discloses a cutting method of a digital radiography (DR) image. The cutting method comprises the following steps of: performing downsampling on a digital radiography (DR) image to obtain an image B; preliminarily determining a boundary image O of a light-bunching device in the image B; judging whether the length T[i] of each boundary of the image O satisfies an equation TX[i]>c3*width or TY[i]>c4*height, and determining the boundary as the boundary of the light-bunching device if the length T[i] of the boundary of the image O satisfies the equation, and returning to a boundary coordinate, otherwise, shifting to a next step; judging whether a hypothetical boundary satisfies boundary conditions of gray local characteristics according to the gray local characteristics of a light-bunching device area in the digital radiography (DR) image, and determining the hypothetical boundary as the boundary of the light-bunching device if the hypothetical boundary satisfies the boundary conditions of the gray local characteristics, and returning to the boundary coordinate, and otherwise, shifting to the boundary coordinate of the digital radiography (DR) image; and cutting the digital radiography (DR) image according to the obtained boundary coordinate. According to the cutting method of the digital radiography (DR) image of the invention, the boundary of the light-bunching device is positioned in the digital radiography (DR) image through adopting a multi-resolution mode, and therefore, cutting efficiency of the digital radiography (DR) image can be improved; the boundary of the light-bunching device is finally determined based on the gray local characteristics of the digital radiography (DR) image, and therefore, the accuracy of the cutting of the digital radiography (DR) image is improved.
Description
technical field [0001] The invention relates to a medical image processing technology, in particular to a method for removing a beam light device area from a DR image by cutting. Background technique [0002] With the continuous development of modern medical technology and the continuous improvement of medical diagnosis methods, DR images realized by direct digital X-ray photography system (Digital Radiography, DR) are widely used in clinical diagnosis, medical research and other DR image analysis. [0003] In the current clinical practice of orthopedics, in order to reduce the additional radiation dose of patients and pharmacists, the beam beam device is usually used in digital X-ray photography equipment to limit the shooting area. For doctor's diagnosis, the beam beam area does not contain any useful information, and it will affect the image processing speed. Therefore, it is necessary to completely remove the light beam device area in the DR image, so as to improve the ...
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IPC IPC(8): G06T7/00
Inventor 郭朋康雨
Owner SHENZHEN LANDWIND IND