Pseudo-color display method for high-gray-scale weld seam negative film image

Abstract

The invention relates to a pseudo-color display method for a high-gray-scale weld seam negative image, which overcomes the problems that details are lost and required information is difficult to obtain by human eyes when a high-gray-scale image is displayed in the prior art, and can achieve the purpose of keeping the image details not lost in precision by using a common civil display for display. The method comprises the following steps: (1) normalizing a JET chromatogram capable of highlighting image details to 10-bit depth, updating a color distribution sequence, and obtaining a color distribution curve by utilizing drawing software; (2) taking the color contained in the 10-bit JTE chromatogram as a reference value, carrying out proportion calculation on the reference value and the high-gray-scale image to obtain a color multiple and a color compensation value which need to be amplified, removing an overlapping region generated when the numerical value is close to 255 in each stage, and carrying out segmented smooth mapping to finish reconstruction of a color mapping table; and (3) improving the appearance quality of the high-gray-scale weld seam image after the pseudo-color enhancement through color space conversion.

Description

Technical field: [0001] The invention belongs to the technical field of image processing, and relates to a pseudo-color display method for high-gray-scale weld film negative images. Background technique: [0002] Non-destructive testing—Quality appraisal of radiographic film digitization system (GB / T26141.2) stipulates the requirements for the digital quality level of the film, and the digital resolution is expressed in bits. Digitized images are divided into DS, DB, and DA levels. At present, most of the pictures used in the field of weld defect detection are DS-level. DS-level images are characterized by sufficient detailed information, obvious features, and a bit depth of at least 12 bits. [0003] The higher the grayscale level of the image, the more image details and more obvious features can be saved, but in the grayscale image containing a lot of information, if the brightness difference between adjacent pixels is small, the required information can be extracted from ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a false color display method for high grayscale weld negative film images, which overcomes the existing problems in the high grayscale image display in the prior art. The details of the image are lost, and it is difficult for the human eye to obtain the required information. Using ordinary civilian displays can achieve the purpose of retaining image details without losing accuracy.

Images