Flicker detection method and device thereof

A flicker detection and waveform technology, applied in the field of image processing, can solve the problems of not working all the time, affecting image quality, image flickering, etc., and achieving the effect of less noise

Active Publication Date: 2009-10-28
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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Problems solved by technology

[0006] Because this judgment method needs to change the exposure time twice, it is not only time-consuming and labor-intensive, but most importantly, this detection method is destructive, because if it turns out to be a normal image without flickering, the exposure time will be changed twice. During the process, not only the brightness of the image will change, but also the image may flicker, which will affect the image quality
In addition, the detection method does not work all the time since the method needs to change the exposure time, which makes the method inflexible

Method used

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  • Flicker detection method and device thereof

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Embodiment Construction

[0039] The inventive concept of the present invention is: read the current frame, obtain the vertical waveform of the current frame; carry out frequency spectrum analysis to the vertical waveform, or carry out frequency spectrum analysis on the difference between the vertical waveform of the current frame and the vertical waveform of the historical frame, that is, the frame difference waveform, if If there is a peak on the frequency spectrum, judge whether there is flicker according to the proximity of the frequency corresponding to the peak to the theoretical peak frequency point.

[0040] It is preferred to use the frame difference waveform to judge, utilize the periodicity of the frame difference waveform of the two frames of images when the image flickers, and use Fourier transform to make the frame difference waveform appear as a peak on the spectrogram. The peak and the position of the peak are reasonable to judge whether there is flicker.

[0041] The flicker detection ...

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Abstract

The invention discloses a flicker detection method and a device thereof and the device can carry out real-time detection without affecting the image quality. The method comprises the following steps of: reading a current frame, and obtaining the vertical waveform of the current frame; carrying out frequency spectrum analysis on the vertical waveform or carrying out frequency spectrum analysis on the difference (frame difference waveform) of the vertical waveform of the current frame and the vertical waveform of the historical frame; if the peak exists on the frequency spectrum, judging whetherthe flicker exists or not according to the approaching degree of the frequency of the peak corresponding point and the theoretical peak frequency point.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and a device for judging the flicker phenomenon in a row exposure mode of a photosensitive device. Background technique [0002] When the digital camera device is working, in order to adapt to artificial light sources of different frequencies and outdoor natural light, some parameters of the camera device must be set accordingly, and one of the more important parameters is the automatic exposure time of the camera device. When the photosensitive device is in the row exposure mode, under the light, the light energy received by each row is different, and flicker (flicker) may occur, as shown in Figure 1(a) and Figure 1(b). In order to eliminate this kind of flicker, set the exposure time in multiples of 1 / 100 second (50Hz) or 1 / 120 (60Hz). [0003] However, in the process of actual use, there is often a mismatch between the parameter settings of the camera device...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
Inventor 沈操王浩陶茜朱玉
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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