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Noise point changing determination method and device

A technology of noise and change range, applied in the field of noise change judgment method and device, can solve the problem of low accuracy of noise change judgment, and achieve the effect of improving accuracy

Active Publication Date: 2016-05-18
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology

[0005] The present invention provides a noise change judgment method and device to solve the problem of low accuracy of noise change judgment in existing noise change judgment schemes

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  • Noise point changing determination method and device
  • Noise point changing determination method and device
  • Noise point changing determination method and device

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0022] See figure 1 , is a schematic flowchart of a noise judgment method provided by an embodiment of the present invention, such as figure 1 As shown, the method may include the following steps:

[0023] It should be noted that the execution subject of steps 101 to 104 can be a digital surveillance camera or a processor in a digital surveillance camera, such as a CPU (CenterProcessUnit, central processing unit). For the convenience of description, the execution of steps 101 to 104 The subject is a digital surveillance camer...

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Abstract

The present invention provides a noise point changing determination method and device. The method comprises: dividing an object image into a plurality of areas; determining the noise point evaluation area in the areas according to the average brightness of pixels in each area and the brightness variance of each pixel in the areas; performing the statistics of the brightness variance of each pixel in the noise point evaluation area; and determining whether noise point changing of the object image occurs according to the brightness variance of each pixel in the noise point evaluation area and the image sensor gain of the noise point evaluation area, and outputting a determination result. According to the embodiment of the invention, the accuracy of the determination of the noise point changing may be improved.

Description

technical field [0001] The invention relates to the technical field of video monitoring, in particular to a method and device for judging noise change. Background technique [0002] In the application of digital surveillance cameras, the noise in the image is an important factor that causes the image quality to decline. Therefore, how to automatically judge the change of the noise is the prerequisite for optimizing the image quality, and it is also a key factor. [0003] At present, the common noise change judgment method is to judge the noise according to the gain of the camera, such as judging the noise change of the image according to the Analoggain (analog gain) and DigitalGain (digital gain) of the sensor (image sensor) of the camera. [0004] However, in some occasions, gain (including analog gain and digital gain) is not the only factor affecting noise, for example, the noise caused by digital image amplification is not caused by gain, that is, the noise change judgme...

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Application Information

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IPC IPC(8): G06T5/00H04N7/18
CPCH04N7/18G06T5/70
Inventor 陈晓雷
Owner ZHEJIANG UNIVIEW TECH CO LTD
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