Camera automatic exposure method based on ambient brightness and image information entropy

A technology of image information and automatic exposure, applied in image communication, parts of color TV, parts of TV system, etc., to achieve the effect of improving adaptability and exposure effect and ensuring real-time performance

Active Publication Date: 2019-12-20
TIANJIN TIANDY DIGITAL TECH
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Problems solved by technology

However, cameras in the field of video surveillance in the intelligent security video industry are widely used in various indoor and outdoor scenes of brightness, contrast and dynamic range. The above methods all have obvious problems in scene adaptability

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  • Camera automatic exposure method based on ambient brightness and image information entropy
  • Camera automatic exposure method based on ambient brightness and image information entropy
  • Camera automatic exposure method based on ambient brightness and image information entropy

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Embodiment Construction

[0041] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0042] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention Creation and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should no...

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Abstract

The invention provides a camera automatic exposure method based on ambient brightness and image information entropy. The camera automatic exposure method comprises the steps of S1, calculating averagebrightness of a graph and the information entropy of an image; calculating the average brightness and the image information entropy of the image according to the brightness histogram of the graph; and S2, obtaining the brightness of the automatic exposure target through weighted calculation by utilizing the image information entropy. The invention provides a camera automatic exposure method basedon ambient brightness and image information. The method is already realized in a 3559A processor + IMX305 image sensor scheme. Tests show that the camera automatic exposure method effectively solvesthe problem of scene adaptability in a traditional AE method, good results can be obtained no matter whether a wide dynamic scene, a high contrast scene or a scene with rich details are processed, andthe requirements of the current intelligent security industry in the field of video monitoring are fully met.

Description

technical field [0001] The invention belongs to the field of video surveillance in the intelligent security industry, and in particular relates to an automatic camera exposure method based on ambient brightness and image information entropy. Background technique [0002] For the automatic exposure (Auto-Exposure, AE) method of the camera, the traditional implementation method is based on the average brightness of the image or the weighted average brightness of the region of interest (Region Of Interest, ROI) as the metering benchmark of the image, or based on dynamic adjustment The method of obtaining the maximum value of image information entropy is used as the target of automatic exposure. However, cameras in the field of video surveillance in the intelligent security video industry are widely used in various indoor and outdoor scenes of brightness, contrast and dynamic range. The above methods all have obvious problems in scene adaptability. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/71H04N23/73
Inventor 白云飞陈澎祥李森肖萌璐王健
Owner TIANJIN TIANDY DIGITAL TECH
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