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Casting X-ray high-dynamic image tone mapping method

A high dynamic image and tone mapping technology, applied in image enhancement, image analysis, image data processing, etc.

Pending Publication Date: 2021-09-14
SHENYANG RES INST OF FOUNDRY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a casting X-ray high dynamic image tone mapping method, which can highlight the overall details of the image at one time without manual intervention, and avoid cumbersome window width and window level Adjustment to improve detection efficiency

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  • Casting X-ray high-dynamic image tone mapping method

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Embodiment 1

[0043] This embodiment provides a casting X-ray high dynamic image tone mapping method, the flow chart is as follows figure 1 As shown, the specific method steps are as follows:

[0044] Step 1. Get image slices:

[0045] Step 1.1: Obtain the dynamic range of the image and the total number of pixels in the image

[0046] L range = l max -l min

[0047] f range =m×n

[0048] where l max is the maximum gray value of the initial image, l min is the minimum gray value of the initial image, according to l max with l min Get the dynamic range l of the initial image range , m is the height of the initial image, n is the width of the initial image, f range is the total number of pixels in the initial image.

[0049] Step 1.2: Determine the threshold l of each slice image ei

[0050] In the present invention, the threshold value of each slice is jointly determined by the gray level of the initial image and the frequency of the gray level. First, the threshold I determin...

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Abstract

The invention discloses a casting X-ray high-dynamic image tone mapping method, global information of an image is completely reserved by combining an image dynamic range segmentation method of image spatial domain and frequency domain information, and a final image is enabled to keep edge and texture information of an original image by an image fusion weight calculation method based on guided filtering, casting X-ray high-dynamic image tone mapping is completed. According to the casting X-ray image enhancement method, window width and window level adjustment operation is simulated, an image dynamic range segmentation method combining image spatial domain and frequency domain information is provided, and global information of the image is completely reserved. According to the image fusion weight calculation method based on guiding filtering, the final image can keep the edge and texture information of the original image, and the operation efficiency of the algorithm is also improved.

Description

technical field [0001] The invention relates to the field of casting defect detection and image processing, in particular to a casting X-ray high dynamic image tone mapping method. Background technique [0002] Due to various reasons such as casting technology and materials, there are often various defects inside castings. Based on X-ray digital imaging technology, images containing internal structure and defect information of castings can be directly generated, which is a non-destructive testing technology widely used in the field of casting testing. However, with the continuous improvement of X-ray digital imaging technology, the bit depth of X-ray images has been developed from 8bit to 16bit, and the display still stays at 8bit image display, and only a small number of special displays can display 10-12bit images. Even so, with the expansion of the dynamic range of the display, the brightness of the display is also higher, which is not suitable for human eyes to observe ...

Claims

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Application Information

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IPC IPC(8): G06T5/40G06T5/00G06T5/50
CPCG06T5/40G06T5/50G06T2207/10116G06T2207/20208G06T2207/20221G06T5/92G06T5/70
Inventor 于涵李兴捷尚尔峰
Owner SHENYANG RES INST OF FOUNDRY
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