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Double-registration method for different-exposure images in wide dynamic camera

A technology of exposure and camera, applied in the field of image processing, can solve problems such as large amount of calculation, and achieve the effect of improving registration accuracy

Inactive Publication Date: 2014-12-10
ZHEJIANG RADIO AND TELEVISION GROUP
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Problems solved by technology

[0019] The purpose of the present invention is to overcome the defect that the registration algorithm based on image features in the existing wide dynamic camera is too large to realize the registration of images with different exposures, and proposes a double registration method for images with different exposures in the wide dynamic camera. Quasi-law

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings.

[0063] A double registration method for images with different exposures in a wide dynamic camera, the specific steps are as follows:

[0064] Step (1) Obtain the response function g of the shooting hardware, the acquisition method specifically is:

[0065] Under static conditions, the shooting hardware shoots P (P≥2) images with different exposures for the same scene, uniformly samples N pixels in each image, and uses the pixel value and exposure time corresponding to each sampled pixel, Get the response function g(Z of the shooting hardware ij ) = lnE i +lnΔt j ;

[0066] Among them, Z ij Represents the pixel value of the i-th sampling pixel of the j-th image, E i Indicates the brightness value of the i-th sampling pixel point, the Δt j Indicates the exposure time of the jth image;

[0067] Z ij and Δt j is known, E i and the function g is unknown, the func...

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Abstract

The invention relates to a double-registration method for different-exposure images in a wide dynamic camera. An existing wide dynamic camera is overlarge in calculation amount due to the fact that an image feature based registration algorithm is utilized to realize registration of the different-exposure images. The double-registration method for the different-exposure images in the wide dynamic camera includes that multichannel data of video images different in exposure are acquired through shooting hardware, videos with same exposure are registered respectively, the different-exposure images are reregistered by utilizing registered video images, registration accuracy of the different-exposure video images is improved, and needed wide dynamic images are synthesized finally. By the method, registration effect of the different-exposure video images of the handle wide dynamic camera can be improved, the wide dynamic video better in imaging effect is synthesized, and registration operation amount is reduced. By the method, by the aid of double registration, registration accuracy of the different-exposure images is improved, and imaging quality of the wide dynamic image is improved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for capturing and processing wide dynamic video images, in particular to a double registration method for images with different exposure degrees in wide dynamic cameras. Background technique [0002] The real world observed by the human eye contains extremely rich information such as brightness and color, but the image data provided by current consumer image and video capture devices often use 8bit to record a single color value of a pixel. 8bit data can only record 256 different levels, which is obviously not enough, because the brightness range that the human eye can perceive (called the visual range) is extremely wide, from a few thousandths of a nit to several million nits special. With current consumer image and video capture devices, pixel values ​​that are too bright and too dark are incorrectly recorded, resulting in a loss of image detail. Wide dynamic ...

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Application Information

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IPC IPC(8): H04N5/235H04N5/243
Inventor 杨勇宋暘陈晓东周建海陈宏应跃波陈宪周智敏胡键巧吴宇超吴晓东潘永杰胡伟沈泰阁蒋丰李震
Owner ZHEJIANG RADIO AND TELEVISION GROUP
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