X-ray image enhancement method based on image pyramid

An image pyramid and image enhancement technology, applied in the field of radiation imaging, which can solve the problems of inability to clearly display dark areas and limited contrast enhancement.

Active Publication Date: 2019-07-16
BEGOOD TECH
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Problems solved by technology

Although the traditional method can improve the contrast of the image to a certain extent, the contrast improvement of the darker area with very small gray value difference in the radiation imaging image is limited, and the purpose of clearly showing the outline of the dark area cannot be achieved.

Method used

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  • X-ray image enhancement method based on image pyramid
  • X-ray image enhancement method based on image pyramid
  • X-ray image enhancement method based on image pyramid

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Embodiment Construction

[0056] A kind of X-ray image enhancement method based on image pyramid, its step:

[0057] 1. Image segmentation:

[0058] The purpose of image segmentation is to divide the original image into a target image and a background image. In an X-ray image, the object to be scanned is called the target after imaging, and the area outside the target object is called the background. Since the X-rays in the background are not absorbed by any object, the gray value of the pixel is larger and appears as a white area. The target image segmentation is to set the pixel value of the background area to 0, while the pixel value of the target object remains unchanged. The background image segmentation is to keep the pixel value of the background area unchanged, and set the pixel value of the target object to 0. The subsequent image enhancement processing of this method is only performed on the target image.

[0059] Step 1.1: Set the segmentation threshold thr.

[0060] thr=c*Max.

[0061]...

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Abstract

The invention discloses an X-ray image enhancement method based on an image pyramid. The method mainly comprises the steps of image segmentation, Gaussian pyramid and Laplacian pyramid construction, image detail enhancement, image reconstruction fusion, background restoration and the like. The method has the advantages that on the premise that the background of the X-ray image is not changed, thecontrast ratio of a black area with small image gray value difference can be remarkably improved, and the outline of an object in the image can be clearly seen.

Description

technical field [0001] The invention relates to an image processing technology in the field of radiation imaging, in particular to an image processing method for enhancing the contrast of a darker area in a radiation image. Background technique [0002] Radiation imaging uses radiation perspective scanning imaging technology to generate a grayscale image of the object to be scanned, that is, an X-ray image. The data type of an X-ray image pixel is generally a 12-bit or 16-bit integer. Radiation imaging technology is widely used in customs vehicle safety inspection, medical diagnosis and other fields. According to its imaging principle, the absorption rate of rays by an object increases exponentially with the thickness and density of the object, so the thicker or denser the object, the smaller the corresponding gray value in the image, and the lower the gray value Regional differences are also less pronounced. Therefore, the inner contour of the darker area (lower gray val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/136G06T5/00G06T7/194
CPCG06T7/136G06T7/194G06T5/003G06T2207/10116G06T2207/20016G06T2207/20221
Inventor 张海平范美仁陈松林
Owner BEGOOD TECH
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