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Method of eliminating DR image static state grid shadow

A technology for filtering grids and images, applied in the field of image processing, can solve the problem of high complexity of Fourier spectral interpolation algorithm, achieve the effect of not affecting image quality and removing grid shadows

Inactive Publication Date: 2016-07-20
CRYSTAL ELECTRONICS TECH LTD
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Problems solved by technology

However, the Fourier spectrum interpolation algorithm used in the method is complex, and improper interpolation is likely to cause more artificial artifacts after the inverse transformation

Method used

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  • Method of eliminating DR image static state grid shadow
  • Method of eliminating DR image static state grid shadow
  • Method of eliminating DR image static state grid shadow

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings, but the present invention is not limited only to the following embodiments. Such as figure 1 As mentioned above, a preferred embodiment of a method for removing static grid shadows in a DR image according to the present invention specifically includes the following steps:

[0024] 1. Acquisition of empty exposure images

[0025] First acquire an empty-exposure DR image without placing any objects.

[0026] 2. Discrimination of grating shadow spectrum area

[0027] A Fourier transform is performed on the resulting empty-exposure image to transform the image from the spatio-temporal domain to the frequency domain. With the origin of the spectrum as the center, find the position of the grid shadow in the spectrum in the horizontal and vertical directions, and measure the area occupied by the grid shadow in the spectrum image.

[0028] 3. Frequency domain filte...

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Abstract

The invention discloses a method of eliminating DR image static state grid shadow. The method is characterized in that a spatial convolution kernel template can be produced, and can be stored in a DR control system; the convolution of the image to be processed can be carried out by using the spatial convolution kernel to acquire the processing result image. The method is used to solve the problems of the prior art such as the quality decreasing of the medical image and the bad influence on the diagnosis of the doctor caused by the grid shadow of the prior art, and the complicated and low-reliability solution, and is advantageous in that the grid shadow can be effectively eliminated, the medical image quality can be improved, and the diagnosis and the treatment of the doctor can be better facilitated.

Description

technical field [0001] The invention relates to an image processing technology, in particular to a method for removing static grid shadows of DR images. Background technique [0002] The existence of scattered rays in the imaging process of X-ray equipment reduces the overall contrast of the image and affects the image quality. The function of the grid is to filter out the scattered rays emitted by the scatterer before reaching the photo. However, due to the material and resolution of some grids, they will bring stripe-like artifacts to the final imaging results, which are called grid shadows. The grid shadows of the grids will affect the display of normal tissues in the image, and then affect the doctor's diagnosis of the disease. diagnosis. The current DR equipment generally uses digital image processing technology to improve the grid shadow problem, which is usually divided into spatial domain processing and frequency domain processing methods. Spatial domain processin...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 不公告发明人
Owner CRYSTAL ELECTRONICS TECH LTD
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