CN113643194A - Pseudo-color display method for high-gray-scale welding seam negative image - Google Patents
Pseudo-color display method for high-gray-scale welding seam negative image Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 22
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Abstract
The invention relates to a pseudo-color display method for a high-gray-scale welding seam negative film image, which solves the problems of loss of details and difficulty in acquiring required information by human eyes during high-gray-scale image display in the prior art, and can achieve the purpose of keeping the image details without losing precision by using a common civil display for display. The invention comprises the following steps: (1) normalizing the image details to 10-bit depth by using a JET chromatogram which can highlight the image details, updating the color distribution sequence, and obtaining a color distribution curve by using drawing software; (2) taking the color contained in the 10-bit JTE chromatogram as a reference value, carrying out proportional calculation with the high gray-scale image to obtain a color multiple and a color compensation value which need to be amplified, removing an overlapped region generated when each stage is close to 255 in numerical value, carrying out piecewise smooth mapping, and completing the reconstruction of a color mapping table; (3) and the appearance quality of the high-gray-scale welding line image after pseudo-color enhancement is improved through color space conversion.
Description
The technical field is as follows:
the invention belongs to the technical field of image processing, and relates to a high-gray-scale welding seam negative film image pseudo-color display method.
Background art:
quality certification (GB/T26141.2) for non-destructive inspection-radiographic film digitizing systems specifies the requirement for film digitizing quality levels, in bits representing digital resolution. The digital image is divided into DS, DB and DA levels, most of the pictures used in the field of weld defect detection are DS levels at present, and the DS level images are characterized by full detail information, obvious characteristics and at least 12 bit depth.
The higher the gray scale level of the image is, the more the details of the image can be saved, the more the features are obvious, but in the gray scale image containing a large amount of information, if the brightness difference between adjacent pixels is small, the extraction of the required information from the image has great difficulty for human eyes, especially for the weld image with low overall brightness and contrast.
The current mainstream method of the 12-bit high-gray-scale weld image is to use a medical or drawing special display with high price to achieve the purpose of not losing image details, but the cost is high and the price is more than ten thousand yuan.
The invention content is as follows:
the invention aims to provide a pseudo-color display method for a high-gray-scale welding seam negative film image, which solves the problems of loss of details and difficulty in acquiring required information by human eyes during high-gray-scale image display in the prior art, and can achieve the purpose of keeping the image details from losing precision by using a common civil display for display.
In order to achieve the purpose, the invention adopts the technical scheme that: a pseudo-color display method for a high-gray-scale welding seam negative image is characterized by comprising the following steps: the method comprises the following steps:
(1) normalizing the image details to 10-bit depth by using a JET chromatogram which can highlight the image details, updating the color distribution sequence, and obtaining a color distribution curve by using drawing software;
(2) taking the color contained in the 10-bit JTE chromatogram as a reference value, carrying out proportional calculation with the high gray-scale image to obtain a color multiple and a color compensation value which need to be amplified, removing an overlapped region generated when each stage is close to 255 in numerical value, carrying out piecewise smooth mapping, and completing the reconstruction of a color mapping table;
(3) and the appearance quality of the high-gray-scale welding line image after pseudo-color enhancement is improved through color space conversion.
Further, the step (1) comprises the following steps:
s1, normalizing the JET chromatographic image with the depth of 8 bits to be 10 bits deep;
s2, changing the normalized color arrangement sequence of the color spectrums, wherein the changed sequence comprises 6 stages of deep red, positive yellow, positive green, positive cyan, positive blue and deep blue, and the total number of the colors is increased to 1280;
and S3, checking the color spectrum table after updating the color arrangement sequence through drawing software to obtain the functional relation of color distribution.
Further, the step (2) comprises the following steps:
s1, taking different colors contained in a JET chromatogram with the depth of 10 bits as a reference value, and dividing the reference value by 4096 colors with different depths contained in a 12-bit high gray-scale image to obtain a color multiple needing amplification and a color compensation value of each stage;
s2, removing an overlapping area generated when elements in three channels of each stage R, G, B are close to 255 in value;
and S3, carrying out segmented smooth mapping to complete the reconstruction of the color mapping table.
Further, the step (3) comprises the following steps:
s1, converting the RGB color space into HSV color space;
s2, iteratively accessing the image by the pointer, and changing the numerical value of the H channel;
and S3, converting the HSV color space into the RGB color space.
Compared with the prior art, the invention has the following advantages and effects:
1. the algorithm provided by the invention can ensure that the 12-bit high-gray-scale welding line image is displayed without a professional display, and the purpose of keeping the image details without losing the precision can be achieved by using a common civil display for display. Practical tests prove that the method is simple and effective and has practical feasibility.
2. The invention provides a color mapping table reconstruction algorithm for a high-gray-scale welding seam negative image, and solves the problem that details are lost after the high-gray-scale welding seam negative image is colorized, aiming at the problems that the traditional color mapping algorithm, such as a gray-scale color algorithm, a density layering method, a pixel self-changing method and the like, can cause the loss of welding seam defect information, the darkness of the whole image, the blurring of welding bead boundaries and the like after the high-gray-scale welding seam negative image is colorized.
3. The invention is researched from the sense aspect of human, and finds that human eyes are sensitive to green areas. In order to extract corresponding information from the high-gray-scale welding seam negative image containing a large amount of details, the invention utilizes the intuitiveness of the HSV color space to the color display to change the value of an H channel of the HSV color space, so that the colorized high-gray-scale welding seam image is in the sensitive range of human eyes.
Description of the drawings:
FIG. 1 is a block diagram of the algorithm of the present invention.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. The implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in routine experiments.
Referring to fig. 1, the method of the present invention comprises the steps of: firstly, changing a JET chromatogram normalized to 10-bit depth and a color arrangement sequence, and acquiring a color distribution rule by using professional drawing software; secondly, taking different colors contained in the JET chromatogram with the depth of 10 bits as reference values, performing mathematical operation on the reference values and the number of the colors with different depths contained in the 12-bit high gray-scale image to obtain a color multiple relation and a color compensation value, and modifying the reference values on the basis of the color distribution rule of the JET chromatogram with the depth of 10 bits to complete the reconstruction of a color mapping table; and finally, the appearance quality of the picture is improved by changing the value of the H channel by using the characteristic that the HSV space is more visual to the color expression, and the picture is displayed.
The invention relates to a high gray scale welding seam negative film image pseudo color display method which specifically comprises the following steps:
step 1: acquiring a 10-bit chromatographic color distribution curve, which mainly comprises the following steps:
1) normalizing the 8-bit deep JET chromatogram image to 10-bit depth;
2) changing the normalized color arrangement sequence of the color spectrums;
3) checking the chromatographic chart after updating the color arrangement sequence through drawing software to obtain a functional relation of color distribution;
according to the invention, a JET chromatogram capable of effectively highlighting image details is selected, and the JET chromatogram is amplified to 10-bit depth by a normalization method; secondly, changing the color arrangement sequence of the color spectrum, wherein the changed sequence comprises 6 stages of deep red, positive yellow, positive green, positive cyan, positive blue and deep blue, and the total number of the colors is increased to 1280; and finally, acquiring a color mapping rule by using drawing software.
The innovation point of the invention is that the 8-bit to 12-bit deep amplification is not directly selected, but 8-10-12-bit amplification mode is selected, so as to lay a foundation for subsequent color remapping and maximally retain the precision.
Step 2: the method for reconstructing the color mapping table of the high-gray-scale image mainly comprises the following steps:
1) calculating the color multiple to be compensated;
2) calculating color compensation values of the regions;
3) calculating color compensation values of the regions;
4) and (5) segment smooth mapping.
Firstly, taking different colors contained in a JET chromatogram with the depth of 10 bits as reference values, and dividing the reference values by 4096 colors with different depths contained in a 12-bit high gray-scale image to obtain color multiples needing to be amplified and color compensation values of each stage; then, the overlapping regions generated when the elements in three channels of each stage R, G, B are close to 255 in value are removed; and finally, carrying out segmented smooth mapping to complete the reconstruction of the color mapping table.
The innovation point of the invention is that the change value of each pixel is accessed by regional and sectional iteration by using the multiple relation between the 12-bit image and the 10-bit image.
And step 3: the sensory quality is improved, and the main steps comprise:
1) converting the RGB color space into HSV color space;
2) the pointer iteratively accesses the numerical value of the H channel;
3) the HSV color space is converted to an RGB color space.
The high-gray-scale welding line image contains a large amount of information, the difference between adjacent pixels is small, the color of the background is similar to that of the characteristic region, and the extraction of the required information is difficult for human eyes. The sensitive area of human eyes is green, and in order to improve the sensory quality, the sensitivity of human eyes to the background needs to be weakened, and the sensitivity to the welding seam area needs to be improved. Comparing the RGB color space with the HSV color space, the HSV color space is more intuitive in expression of colors and is suitable for relevant work such as background color processing, and the RGB space is suitable for a display system. The image is converted into HSV color space from RGB color space, the H channel of the image is traversed through the pointer, and the color of the welding line area is located in the sensitive area of human eyes by increasing the numerical value of the H channel.
The above embodiments are merely illustrative of the principles and effects of the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (4)
1. A pseudo-color display method for a high-gray-scale welding seam negative image is characterized by comprising the following steps: the method comprises the following steps:
(1) normalizing the image details to 10-bit depth by using a JET chromatogram which can highlight the image details, updating the color distribution sequence, and obtaining a color distribution curve by using drawing software;
(2) taking the color contained in the 10-bit JTE chromatogram as a reference value, carrying out proportional calculation with the high gray-scale image to obtain a color multiple and a color compensation value which need to be amplified, removing an overlapped region generated when each stage is close to 255 in numerical value, carrying out piecewise smooth mapping, and completing the reconstruction of a color mapping table;
(3) and the appearance quality of the high-gray-scale welding line image after pseudo-color enhancement is improved through color space conversion.
2. The high gray scale weld seam negative film image pseudo color display method according to claim 1, characterized in that: the step (1) comprises the following steps:
s1, normalizing the JET chromatographic image with the depth of 8 bits to be 10 bits deep;
s2, changing the normalized color arrangement sequence of the color spectrums, wherein the changed sequence comprises 6 stages of deep red, positive yellow, positive green, positive cyan, positive blue and deep blue, and the total number of the colors is increased to 1280;
and S3, checking the color spectrum table after updating the color arrangement sequence through drawing software to obtain the functional relation of color distribution.
3. The high gray scale weld seam negative film image pseudo color display method according to claim 1 or 2, characterized in that: the step (2) comprises the following steps:
s1, taking different colors contained in a JET chromatogram with the depth of 10 bits as a reference value, and dividing the reference value by 4096 colors with different depths contained in a 12-bit high gray-scale image to obtain a color multiple needing amplification and a color compensation value of each stage;
s2, removing an overlapping area generated when elements in three channels of each stage R, G, B are close to 255 in value;
and S3, carrying out segmented smooth mapping to complete the reconstruction of the color mapping table.
4. The high gray scale weld seam negative film image pseudo color display method according to claim 3, characterized in that: the step (3) comprises the following steps:
s1, converting the RGB color space into HSV color space;
s2, iteratively accessing the image by the pointer, and changing the numerical value of the H channel;
and S3, converting the HSV color space into the RGB color space.
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| WO2018113248A1 (en) * | 2016-12-20 | 2018-06-28 | 惠科股份有限公司 | Display device and method for driving display panel thereof |
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| JP2011038947A (en) * | 2009-08-14 | 2011-02-24 | Lasertec Corp | Defect inspection device and image display method |
| CN105225256A (en) * | 2015-06-10 | 2016-01-06 | 西安交通大学 | A kind of display packing of high gray depth image |
| WO2018113248A1 (en) * | 2016-12-20 | 2018-06-28 | 惠科股份有限公司 | Display device and method for driving display panel thereof |
| CN107918928A (en) * | 2017-11-10 | 2018-04-17 | 中国科学院上海高等研究院 | A kind of color rendition method |
| CN109886214A (en) * | 2019-02-26 | 2019-06-14 | 中南民族大学 | A kind of chirm characteristic strengthening method based on image procossing |
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Non-Patent Citations (1)
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| 李志球;梁双华;: "改进的灰度级-彩色变换法在B超图像中的应用" * |
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