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Image luminosity calibration method and device and computer readable storage medium

A calibration method and image technology, applied in the field of image processing, can solve problems such as weak constraint relations, decreased solution accuracy, and unstable optimization process, and achieve the effects of improving robustness, ensuring continuity, and good estimation accuracy

Pending Publication Date: 2021-06-29
CHINA TELECOM CORP LTD
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Problems solved by technology

In some specific scenarios, for example, when the number of image blocks that can be used for photometric calibration experiments is small, or the constraint relationship generated by image blocks is weak, these methods will encounter robustness problems, that is, the optimization process is unstable, and the solution Decreased accuracy, etc.

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  • Image luminosity calibration method and device and computer readable storage medium
  • Image luminosity calibration method and device and computer readable storage medium
  • Image luminosity calibration method and device and computer readable storage medium

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] The relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0041] At the same time, it should be understood that, for the convenience of d...

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Abstract

The invention discloses an image luminosity calibration method and device and a computer readable storage medium, and relates to the technical field of image processing. The image luminosity calibration method comprises the following steps: acquiring gray values of pixels in an image shot by a to-be-calibrated imaging device and corresponding reference information; constructing an inverse function of a response function of the imaging equipment based on a generalized index gamma model, and constructing a corresponding loss function; substituting the obtained gray values of the pixels and the corresponding reference information into a loss function for solving so as to obtain parameters of a generalized index gamma model when the loss function is minimized, and further determining an inverse function of a response function of the imaging equipment; and mapping a gray value of a to-be-corrected image shot by the imaging equipment by adopting an inverse function of the response function so as to obtain a corrected image. According to the invention, better estimation precision can be obtained, or fewer image samples are used on the premise that the same estimation precision is achieved. Therefore, the robustness of image luminosity calibration is improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image photometric calibration method, device and computer-readable storage medium. Background technique [0002] Imaging equipment, such as photosensitive film, CCD / CMOS array, and nonlinear effects in the post-processing of imaging equipment will lead to a nonlinear mapping between the pixel brightness value (Pixel Intensity) of the digital image and the actual light intensity (Lightirradiance) relation. Photometric calibration, also known as radiometric calibration (Radiometric Calibration), refers to the process of obtaining the nonlinear response function (Response Function) of imaging equipment to light intensity through experimental means and corresponding algorithms, so as to restore linear radiometric information. By obtaining real irradiance information, we can improve the performance of various pattern recognition or computer vision algorithms, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 屈振华马涛龙显军
Owner CHINA TELECOM CORP LTD
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