Method, device and equipment for acquiring high-dynamic range image based on double cameras
A high dynamic range, dual-camera technology, applied in the field of image processing, can solve problems such as underexposure and overexposure errors, poor high dynamic range image quality, insufficient exposure of underexposed images and overexposed images, etc., to achieve guaranteed Accuracy, quality improvement, and user experience improvement
Active Publication Date: 2018-07-27
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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[0004] However, due to the fact that there may be truncation characteristics at both ends of the color histogram of the preview image in actual applications, resulting in large errors in the estimated underexposure and overexposure, so that the exposure of the acquired underexposed image and overexposed image is not enough. , thus affecting the dynamic range of the acquired high dynamic range image, making the quality of the acquired high dynamic range image poor
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[0028] 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.
[0029] In order to solve the problem in related technologies, when estimating the underexposure and overexposure according to the color histogram of the preview image, there may be truncation characteristics at both ends of the color histogram of the preview image, which will cause the estimated underexposure and overexposure There is a large error, which makes the exposure of the acquired underexposed image and overexposed image insufficient, resulting in the problem of poor quality of the final acquired high dynamic range i...
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The invention discloses a method, a device and equipment for acquiring a high-dynamic range image based on double cameras. The method comprises the following steps: generating a preview image according to an image acquired by the first camera; adjusting an exposure value of the second camera and respectively determining a corresponding underexposure compensation value and a corresponding overexposure compensation value when each color channel histogram corresponding to an image acquired by the second camera meets preset conditions; obtaining the high-dynamic range image according to the underexposure compensation value and the overexposure compensation value. The method disclosed by the invention has the beneficial effects that the images acquired by the non-preview cameras are realized; the optimal under-exposure compensation value and the optimal over-exposure compensation value corresponding to a shooting scene are dynamically determined, so that not only the accuracy of the underexposure compensation value and the overexposure compensation value can be guaranteed, but also the quality of the finally-obtained high-dynamic range image is improved, and the user experience is improved.
Description
technical field [0001] The present application relates to the technical field of image processing, in particular to a dual-camera-based high dynamic range image acquisition method, device and equipment. 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 uses the camera module to capture the picture of the shooting area and preview it, and then determines the color histogram of the preview picture to estimate the amount of underexposure and overexposure, ...
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IPC IPC(8): H04N5/235
CPCH04N23/741
Inventor 刘凯
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD