Method and device for synthesizing HDR (High-Dynamic Range) image by double exposure
A double exposure, image technology, applied in image communication, color TV parts, TV system parts and other directions, can solve the problems of adjusting exposure parameters, poor HDR image effect, affecting user experience, etc.
Active Publication Date: 2019-03-01
FUZHOU ROCKCHIP SEMICON
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[0003] For this reason, it is necessary to provide a technical solution for double-exposure synthesis of HDR images to solve the problem of poor user experience due to the inability to adaptively adjust the exposure parameters according to the current environment during the image shooting process, resulting in poor synthetic HDR images
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[0051] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.
[0052] see figure 1 , is a flowchart of a method for synthesizing an HDR image with double exposure according to an embodiment of the present invention. The method can realize HDR image synthesis, and the method includes the following steps:
[0053] First enter step S101 to receive the first control command, use the first exposure scheme to first expose the first image to obtain the first exposure image, and adopt the second exposure scheme to perform second exposure on the first image to obtain the second exposure image . In this embodiment, the first image is an image collected by an image acquisition unit, and the image acquisition unit may be a camera. The first control command is an image preview command. The exposure time o...
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The invention discloses a method and device for synthesizing an HDR (High-Dynamic Range) image by double exposure. The method comprises the following steps of: receiving a first control command, carrying out first exposure on a first image by adopting a first exposure scheme to obtain a first exposed image, and carrying out second exposure on the first image by adopting a second exposure scheme toobtain a second exposed image, wherein the first exposure scheme and the second exposure scheme are alternatively carried out and an alternating frequency accords with a preset frequency; carrying out caching on the first exposed image and the second exposed image; and receiving a second control command, and synthesizing the HDR image by the first exposed image and the second exposed image through adopting an HDR algorithm. When a previewing operation is carried out on a camera, a first to-be-processed image is processed to obtain the first exposed image, and when an image generation operation is carried out, the first exposed image and the second exposed image can be directly synthesized, so that image generation efficiency is effectively improved, and sensual experience of a user is improved.
Description
technical field [0001] The invention relates to the field of image synthesis processing, in particular to a method and device for double-exposure synthesis of HDR images. Background technique [0002] HDR (High-Dynamic Range) is a photo processing program. When shooting in a large light ratio environment, ordinary cameras cannot record extremely bright or dark details due to the limitation of the dynamic range. Photos processed by the HDR program can obtain better levels than ordinary photos regardless of highlights and dark positions, even when they are taken under high light ratio conditions. At present, for HDR image synthesis, it is usually necessary to use at least three frames of images for synthesis, one frame of normal exposure, one frame of long exposure frame with a fixed ratio, and one frame of short exposure with a fixed ratio. For example, the exposure time of a normal exposure frame is t , the exposure time of the long exposure frame is nt (n is a positive in...
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IPC IPC(8): H04N5/235H04N5/232H04N5/265
CPCH04N5/265H04N23/80H04N23/741
Inventor 罗宁杜松
Owner FUZHOU ROCKCHIP SEMICON