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Image flicker detection method and device, image capture device

A flicker detection and image technology, which is applied in image communication, TV, color TV parts, etc., can solve the problem of rapid and accurate detection of image flicker, and achieve the effect of simple calculation and small amount of calculation

Active Publication Date: 2017-08-11
SPREADTRUM COMM (SHANGHAI) CO LTD
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AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problem of being unable to simply, quickly and accurately detect image flickering in moving scenes

Method used

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  • Image flicker detection method and device, image capture device
  • Image flicker detection method and device, image capture device
  • Image flicker detection method and device, image capture device

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Embodiment Construction

[0037]As described in the background art, in order to eliminate bright bars and flicker in the image, the exposure time of the image sensor can be set to an integer multiple of the light intensity period of the light source (ie, the inverse of the light intensity frequency), that is, the flicker elimination mode. The voltage of the existing alternating current is generally a sine wave of 50Hz or 60Hz. Since the light intensity is only related to the amplitude of the voltage, and has nothing to do with the positive or negative of the voltage, the frequency of the light intensity generated by the lamp is 100Hz or 120Hz. Obviously, if you always set your image capture device to flicker-free mode, you won't get bright bars and flickering in your images when using a fixed-cycle light source (50Hz or 60Hz AC light fixtures).

[0038] However, in practice, the inventors found that in the flicker elimination mode, the exposure time of the image sensor cannot be adjusted continuously, a...

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Abstract

An image flicker detection method and device, and an image capture device. The image flicker detection method includes: performing exposure imaging on an imaging target illuminated by a light source to form an image frame; judging whether any two image frames have relative motion during the exposure imaging process based on the average brightness value of pixels in each row in the image frame; If there is no relative motion, it is detected whether there is a flickering signal based on the pixel brightness average value of each row in the two image frames; if there is a flickering signal, then the frequency of the flickering signal is determined according to the detection result. The technical solution solves the problem that the prior art cannot simply, quickly and accurately detect image flickering in a moving scene.

Description

technical field [0001] The present invention relates to the technical field of image imaging, in particular to an image flicker detection method and device, and an image capture device. Background technique [0002] In common image capturing devices (eg, digital video cameras, cameras, etc.), a global shutter or a rolling shutter is generally used to control the exposure imaging of the imaging target by the image sensor. Among them, for an image sensor controlled by a global shutter, all photosensitive devices receive light at the same time and expose at the same time. After exposure, all photosensitive devices stop receiving light and convert the exposed image into a digital image. Different from the use of global shutter control, for image sensors that use rolling shutter control, all photosensitive devices are exposed sequentially in row order. Because of this exposure method, there is a time difference in the reception of light by each row of photosensitive devices, so t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/243
Inventor 朱洪波彭晓峰王浩林福辉陈敏杰常广鸣牛海军张乐
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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