Window width and window level adjusting method for pixel set with large data volume

Abstract

The invention relates to a window width and window level adjusting method for a pixel set with large data volume, which comprises the following steps of: displaying a gray level image on an ordinary RGB (Red, Green and Blue) display in a window-adding manner through setting a DIB (Device Independent Bitmap) color contrast table aiming at a digital medical image of DICOM (Digital Imaging and Communications in Medicine) format; during the process of adjusting the window width and the widow level of the image in real time, filtering a response frequency through modular arithmetic; intercepting and zooming an interest region of the image; establishing a window adjusting transformation rapid access table, and searching a pixel set in the traversal interest region of the window adjusting transformation rapid access table to obtain a method of displaying a gray level value and the like so as to reduce the amount of calculation during the window adjusting process of the pixel set, so that the window width and the window level can be adjusted continuously and smoothly in real time even for an image file with very large data volume.

Description

technical field [0001] The invention relates to a computer processing method for adjusting the window width and level of a digital image, in particular to a speed optimization method in the process of adjusting the window width and level of a pixel set with a large amount of data. Background technique [0002] The technology of computer image processing helps people to adjust the image conveniently to achieve the desired effect. For the image in DICOM format of medical radiology examination, because it reflects the density imaging of human tissue under the irradiation of radiation rays, its pixels only contain grayscale Information, image data that does not contain RGB color information. [0003] The image data in DICOM format is different from the image bit storage method of ordinary RGB images. It usually uses 8-bit, 16-bit, and 24-bit bit depth to represent the grayscale level of the image. The grayscale level usually reaches 4096 grayscale levels or even higher. The ord...

AI Technical Summary

Problems solved by technology

[0012] Using this traditional algorithm, an average of 5 multiplications (divisions), 4 additions (subtractions), and 2 comparison operations are required for each pixel in the process of adjusting the window width and level. When the user moves the mouse every second to adjust the window width In the process of biting, it is necessary to perform more than 20 to 30 rounds of calculations on all the pixels of the image file per second. The amount of calculation is very huge, and it is difficult to achieve real-time continuous and smooth processing response for image pixel sets with a large amount of data.

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