Automatic dynamic range detection method of reflection scanner

A dynamic range and automatic detection technology, applied in image communication, electrical components, etc., can solve time-consuming and labor-intensive problems

Inactive Publication Date: 2012-07-25
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide an automatic detection method for the dynamic range of a reflective scanner, whic

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  • Automatic dynamic range detection method of reflection scanner
  • Automatic dynamic range detection method of reflection scanner
  • Automatic dynamic range detection method of reflection scanner

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] Detection method of the present invention is specifically implemented according to the following steps:

[0054] Step 1: Build a Color Conversion Lookup Table

[0055] Let the neutral gray Gray=R=G=B, wherein the value range of Gray is 0, 1, 2,..., 255, take M values ​​in this range, and use these M neutral grays Gray=R=G=B value Read the corresponding M L values ​​in the color picker of Photoshop to obtain the look-up table data of neutral gray Gray and L; the value range of the red component R is 0, 1, 2 ,...,255, take M values ​​in this range, use these M red component R values, and let G=B=0, read the corresponding M values ​​in the color picker of Photoshop L value, get the lookup table data of the red component R and L; the value range of the green component G is 0, 1, 2,..., 255, take M values ​​​​in this range, use these M T...

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Abstract

The invention discloses an automatic dynamic range detection method of a reflection scanner, which includes the following steps of building a color conversion lookup table; measuring CIE (international commission on illumination) Lab value of IT8.7/2 color target grey level and building a standard dynamic range table; scanning IT8.7/2 color target by grey level mode and building a dynamic range table of the scanner; scanning the IT8.7/2 color target by color mode and building a color component dynamic range table of the scanner; computing the dynamic range of the scanner and indistinguishable grey blocks and displaying results visually. By the automatic dynamic detection method, the dynamic range of the scanner can be detected automatically and completely, and quality evaluation and correct selection and use of the scanner are benefited.

Description

technical field [0001] The invention belongs to the technical field of scanner quality detection, and relates to a scanner quality detection method, in particular to a dynamic range automatic detection method of a reflection scanner. Background technique [0002] A scanner is a digitizing input device for a computer. Dynamic range is an important parameter describing the quality of a scanner. The dynamic range of a scanner refers to the light and dark range that the scanner can record, usually from close to pure white to pure black, that is, the difference between the brightest and darkest colors that the scanner can measure. The range reflects the ability of the scanner to reproduce subtle changes in tone, especially the dark tone level and bright tone details. The larger the dynamic range value, the stronger the ability to reproduce subtle changes in the image, enabling the user to distinguish from the highlight and dark areas of the original. Properly captures details i...

Claims

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Application Information

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IPC IPC(8): H04N1/04H04N1/00
Inventor 胡涛马冲聪张玲
Owner XIAN UNIV OF TECH
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