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Method and device for obtaining exposure compensation value of high-dynamic-range image

A high dynamic range and exposure compensation technology, applied in the field of exposure processing, can solve problems such as poor picture quality and effect, underexposure, and overexposure of captured images, so as to improve image quality, user experience, and dynamic optimal exposure compensation Effect

Active Publication Date: 2018-01-26
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Application Information

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Problems solved by technology

[0004] However, due to the large difference in the actual shooting environment, when shooting high dynamic range images through the above methods, it will more or less lead to overexposure or underexposure of the captured image, which makes the quality and effect of the final shot image inferior. Difference

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Embodiment Construction

[0025] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

[0026] In order to solve the problem in related technologies that when using various smart terminal cameras to capture high dynamic range images, the captured images may be over-exposed or under-exposed, resulting in poor quality and effect of the final captured image, a solution is proposed. A method for obtaining exposure compensation value for high dynamic range images.

[0027] The high dynamic range image exposure compensation value acquisition method provided by this application determines the histogram of each color c...

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Abstract

The invention discloses a method and device for obtaining the exposure compensation value of a high-dynamic-range image, wherein the method comprises the steps of: determining various-colour channel histograms corresponding to a current scene, wherein the various-colour channel histograms include the corresponding relationship of different brightness and pixel scales under various-colour channels;according to a pre-set normal exposure brightness threshold value and pixel scale threshold value and the corresponding relationship of different brightness and pixel scales under various-colour channels, determining the underexposure degree and overexpose degree of the current scene; and, according to the underexposure degree and overexpose degree of the current scene, determining the underexposure compensation value and the overexpose compensation value of the current scene. By means of the method disclosed by the invention, the exposure compensation amount of a shot image can be adaptivelydetermined according to different shooting scenes, so that optimal dynamic exposure compensation on the shot image can be realized; therefore, the quality of the shot image is good; and the user experience is improved.

Description

technical field [0001] The present application relates to the technical field of exposure processing, and in particular to a method and device for acquiring exposure compensation values ​​for high dynamic range images. Background technique [0002] Nowadays, all kinds of smart terminals have become a must-have in the daily life of users, and users can operate various functions through terminal devices. For example, a camera in the terminal device is used to capture a high dynamic range image (High-Dynamic Range, HDR for short). Among them, HDR is obtained by fusing three images of a normal exposure image, an underexposed image and an overexposed image. [0003] In the actual application process, when the user uses the camera to shoot high dynamic range images, the terminal device usually first uses the automatic exposure control system (Auto Exposure Control, referred to as: AEC) to take a normal exposure image of the shooting area, and then respectively according to the pr...

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Application Information

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IPC IPC(8): H04N5/235
CPCG06T5/50G06T5/40G06T2207/20208H04N23/741H04N23/743H04N23/10G06T5/90H04N23/86G06T2207/20221H04N9/77H04N23/71G06T5/92
Inventor 刘凯
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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