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Tooth CR image enhancement method and device based on side window filter

An image enhancement and filter technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of loss of image details, uncontrollable enhancement of details and edges, overshoot, etc., and achieve the effect of improving contrast

Pending Publication Date: 2020-05-22
合肥登特菲医疗设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventor found that although the image sharpness obtained by this improved unsharp mask processing method is enhanced, the enhancement of details and edges is uncontrollable. For images with better details, the same denoising method is still used. The method will lose image details; second, the method has an "overshoot" phenomenon after processing an image with high brightness, that is, a pure white pixel appears in an overall dark image

Method used

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  • Tooth CR image enhancement method and device based on side window filter
  • Tooth CR image enhancement method and device based on side window filter
  • Tooth CR image enhancement method and device based on side window filter

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Experimental program
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Embodiment 1

[0053] figure 1 A schematic flowchart of a tooth CR image enhancement method based on a side window filter provided by an embodiment of the present invention, as shown in figure 1 As shown, the method includes:

[0054] S101: Use a side window low-pass filter to perform several filtering processes on the image to be enhanced to obtain a filtered image; use the image to be enhanced to subtract several filtered images respectively to obtain flux maps of several images, wherein, The flux map includes: one or a combination of a low-pass map and a high-pass map.

[0055] Specifically, a side window low-pass filter with a size of 3×3 can be used to filter the image to be enhanced to obtain the first low-pass image corresponding to the image to be enhanced, and subtract the first low-pass image from the image to be enhanced to obtain the image containing A high-pass map of the rough edges of the image;

[0056] Then adopt side window low-pass filter to carry out filter processing ...

Embodiment 2

[0070] On the basis of Embodiment 1 of the present invention, the only difference between Embodiment 2 of the present invention and Embodiment 1 is that the histogram equalization algorithm can be used to equalize the superimposed image to obtain an enhanced image; specifically, it can include The following process: 31), calculate the pixel histogram of the superimposed image; 32), in the pixel histogram, take the center value within the area range of the preset ratio of the histogram area as the current window level; 33), from the The current window level is traversed to the right, and the first minimum value point found is defined as the right value of the image window width right; at the same time, it is traversed from the window level to the left, and the first minimum value point found is defined as the left value of the image window width left; 34), use right-left as the current window width of the image, use the formula, window level=left+(right-left) / 2, update the curre...

Embodiment 3

[0078] Corresponding to the embodiment of the present invention, Embodiment 3 of the present invention also provides a tooth CR image enhancement device based on a side window filter.

[0079] Figure 11 A schematic structural diagram of a dental CR image enhancement device based on a side window filter provided by an embodiment of the present invention, as shown in Figure 11 As shown, the device includes:

[0080] The filtering module 1101 is used to perform several filtering processes on the image to be enhanced by using a side window low-pass filter to obtain the filtered image; to obtain the flux of several images by subtracting several filtered images from the image to be enhanced graph, wherein the flux graph includes: one or a combination of a low-pass graph and a high-pass graph;

[0081] The superimposing module 1102 is configured to superimpose the flux map on the image to be enhanced according to the weights corresponding to each flux map to obtain a superimposed...

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Abstract

The invention relates to a tooth CR image enhancement method and device based on a side window filter, and the method comprises the steps: 1), carrying out the filtering of a to-be-enhanced image fora plurality of times through employing a side window low-pass filter, and obtaining a filtered image; subtracting the plurality of filtered images from the to-be-enhanced image to obtain flux maps ofthe plurality of images, the flux maps including one or a combination of a low-pass map and a high-pass map; and 2) according to the weight corresponding to each flux graph, superposing the flux graphs in the to-be-enhanced image to obtain a superposed image, and taking the superposed image as an enhanced image. By applying the embodiment of the invention, the problem of overshoot is solved.

Description

technical field [0001] The invention relates to an image enhancement method and device, in particular to a tooth CR image enhancement method and device based on a side window filter. Background technique [0002] CR (Computer Radiography, computer radiography) imaging uses a flexible fluorescent imaging plate (imageplate, IP imaging plate) to replace traditional photographic film to capture digital images. The phosphor layer in the IP panel stores images by irradiating them with x-rays or gamma rays, and then the focused laser releases the stored images in the form of visible light photons, which are collected by the scanner and then amplified and converted into digital image signals. Although CR imaging has a higher resolution than film photography, there is diffuse scattering when the scanner's laser penetrates the IP board, but the image generally needs to be enhanced in definition and edge details. Internationally more advanced image processing methods use Fourier trans...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T5/40G06T7/13
CPCG06T5/40G06T7/13G06T2207/10081G06T2207/20192G06T2207/30036G06T5/94G06T5/73G06T5/70
Inventor 刘铮彭云
Owner 合肥登特菲医疗设备有限公司
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