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Absolute center distance improved algorithm of image based on exposure compensation

An improved algorithm and exposure compensation technology, applied in image analysis, image data processing, calculation and other directions, can solve the problem of loss and restoration of effective image information

Active Publication Date: 2017-07-25
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

[0005] The oversaturation of the grayscale will lead to the loss of effective image information, but this loss cannot be restored by image processing

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  • Absolute center distance improved algorithm of image based on exposure compensation
  • Absolute center distance improved algorithm of image based on exposure compensation
  • Absolute center distance improved algorithm of image based on exposure compensation

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Embodiment Construction

[0046] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0048] This patent discloses an image absolute central moment algorithm based on exposure compensation, which improves the ACM image sharpness evaluation algorithm by utilizing the characteristic that the imaging gray value of the image sensor increases linearly with the exposure value in t...

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Abstract

The invention relates to an absolute center distance improved algorithm of an image based on exposure compensation. The algorithm comprises the steps that a) images of different exposure time are obtained; b) the corresponding number of sampling curves are obtained; c) a grayscale value is obtained; d) whether the grayscale value is greater than 255 is determined; e) the images of different exposure time are converted mutually, and a restored image is obtained; f) whether local detail loss exists in the two images is determined via a contrast grayscale histogram; g) the absolute center distance algorithm of the image is obtained; h) an ACM evaluation function is obtained; i) the distribution probability corresponding to the grayscale iB is obtained; j) an image absolute center distance improved algorithm ECACM independent of the exposure value C is obtained; and l) an evaluation index of the ECACM is obtained via a step k.

Description

technical field [0001] The invention relates to an image definition evaluation algorithm based on exposure compensation, which belongs to the field of image analysis and recognition in computer information processing. Background technique [0002] Visual measurement is a research hotspot in the field of precision measurement. Both its measurement accuracy and visual effect depend on the imaging quality of the image, because the quality of the image is closely related to the availability of its information. Therefore, consistent image sharpness evaluation is a common requirement in various application fields such as structured light measurement, photogrammetry, and digital speckle measurement. [0003] Through digital image processing, we can get more effective information such as gray gradient, high and low frequency and phase in the image. At the same time, with the help of the computer interface and the flexibility of the algorithm, the focusing method based on digital im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 董明利焦阿敏孙鹏王君燕必希娄小平祝连庆
Owner BEIJING INFORMATION SCI & TECH UNIV