RAW space based digital wide dynamic method and device

A wide dynamic and wide dynamic processing technology, applied in the field of image processing, can solve problems such as difficult integration, achieve the effect of improving the brightness of dark areas and controlling the overexposure of bright areas

Active Publication Date: 2016-01-27
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology

[0007] In order to solve the problem that the image collected by the image sensor in the current monitoring equipment (here refers to the IP camera) is generally located in the RAW space, and the digital wide dynamic processing can only be applied to the YCrCb space of the image, and it is not easy to integrate into the existing monitoring equipment. The invention provides a digital wide dynamic method and device based on RAW space

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  • RAW space based digital wide dynamic method and device
  • RAW space based digital wide dynamic method and device
  • RAW space based digital wide dynamic method and device

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Embodiment Construction

[0056] In order to explain the present invention in detail, the present invention will now be further described with reference to the accompanying drawings and embodiments.

[0057] In this embodiment, a digital wide dynamic processing unit for implementing digital wide dynamic The wide dynamic processing unit adopts FPGA chip (Field-Programmable Gate Array, that is, field programmable gate array), of course, DSP or ARM can also be used. The image processing unit in the existing mainstream IP cameras is generally an ASIC chip, and the traditional role of the ASIC chip is used. The digital wide dynamic processing between the ISP module and the encoding module is moved to the FPGA chip with strong flexibility, and a better wide dynamic image is obtained on the basis of not destroying the internal process of the ASIC chip in the existing IP camera solution, making the Digital WDR is easy to integrate into mainstream IP camera solutions. Of course, it is also possible to move all...

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Abstract

The invention relates to a RAW space based digital wide dynamic method. The method is applied to monitor equipment. The method comprises steps of acquiring an RAW space image; and performing digital wide dynamic process on the RAW space image before the RAW space image is sent to an image processing unit of the monitor equipment, wherein according to the digital wide dynamic process, the RAW space image is transferred to a YCrCb space from an RAW space to be split, histogram statistic, histogram adjustment and cumulative histogram are performed on split sub-areas, so as to obtain a histogram mapping curve of a central point of the sub-area, a histogram mapping curve of any point is obtained through an interpolation method, curve mapping is performed on an original point of an area image, and the mapped image is transferred to the RAW space. The invention also discloses a RAW space based digital wide dynamic device by use of the method. The digital wide dynamic directly acts on the RAW space image, so that digital wide dynamic process is easy to integrate into a mainstream internet protocol (IP) camera.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a digital wide dynamic method and device based on RAW space. Background technique [0002] Dynamic range refers to the difference in light intensity between the brightest area and the darkest area in a given scene. The dynamic range that can be represented by traditional digital images that are widely used at present is very limited, which makes the highlight areas in the scene lost due to overexposure. The details are lost, and the dark areas are also lost due to underexposure. For indoor scenes with great contrast between light and dark, traditional IP cameras (Internet Protocol cameras, network cameras) are limited by the photosensitive characteristics of CCD or CMOS, and it is difficult to maintain the details of bright and dark areas, which seriously affects the image quality. [0003] In the field of security, the wide dynamic effect of cameras at nigh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/64H04N5/217G06T5/00
Inventor 羊海龙王智玉
Owner ZHEJIANG UNIVIEW TECH CO LTD
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