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Low-complexity and high-efficiency synthesis method for high-dynamic digital image

A low-complexity, synthetic method technology, applied in the direction of image communication, picture signal generator, color TV parts, etc., can solve the problems of inability to complete real-time processing, high cost, high computational complexity, etc., to increase the dynamic range , fast generation speed, good adaptive effect

Active Publication Date: 2015-01-21
XIDIAN UNIV
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Problems solved by technology

[0007] Although the above methods achieve good results, the cost of the method based on optical imaging devices is too high; the method based on software has high computational complexity, and real-time processing cannot be completed in the camera

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  • Low-complexity and high-efficiency synthesis method for high-dynamic digital image

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides detailed implementation modes and implementation steps, but is not limited to this embodiment.

[0053] Such as Figure 4 As shown, two images of the same scene with different exposure times are obtained first. It should be noted that, generally speaking, it is preferable that there is no movement in the two acquired images; but if there is movement, the images need to be calibrated first, for example: the Y components of the two images can be binarized first, and then The binarized images are made into a pyramid series, that is, the length and width of each level of the image are reduced to 1 / 2 of the original, and a series of images are obtained. Finally, start from the smallest image for comparison, XOR two binary images corresponding to the same level to obtain the difference, an...

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Abstract

The invention discloses a low-complexity and high-efficiency synthesis method for a high-dynamic digital image. The method comprises the steps of acquiring a high-exposure image and a low-exposure image, obtaining corresponding YCbCr components, working out the gradient values of the three components of the bright image and the gradient values of the three components of the dark image, comparing the gradient values of the same components of the two images to obtain the difference, obtaining the weight coefficient of the bright image and the weight coefficient of the dark image, and multiplying the weights by the weight of an original image to synthesize the high-dynamic image. The method has the advantages of being applied to high-dynamic implementation of hardware and increasing the processing speed on the premise of guaranteeing the high-dynamic effect.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a method for high dynamic range image synthesis. The invention has low calculation complexity, less source images required for synthesizing high dynamic images, and is convenient for real-time processing by hardware. technical background [0002] The brightness difference of actual objects in nature can reach a scale of 10^8, while the brightness difference that can be seen by the human eye can reach 10^5. Therefore, currently commonly used image acquisition devices and display devices cannot well show the realness of objects. brightness range. As a result, the details of the bright area will be lost when the picture is acquired in some bright places, such as figure 1 shown. On the contrary, some dark places will lose the details of dark areas, such as figure 2 shown. With the in-depth study of digital images, people gradually discovered the limitations of this kind ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/355H04N5/235H04N9/04
Inventor 宋锐江雄华贾媛李云松王养利
Owner XIDIAN UNIV
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