Image flicker detection method and device, and image capturing device

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

Active Publication Date: 2014-10-15
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0006] The present invention solves the problem of being unable to si

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

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[0037]As mentioned in the background, in order to eliminate the 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 reciprocal of the light intensity frequency), that is, set to the flicker elimination mode. The voltage of the currently used 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 the image capture device is always set to flicker-elimination mode, then when using a fixed-cycle light source (50Hz or 60Hz AC lamps), the bright bars and flicker will not appear in the captured image.

[0038] However, in practice, the inventors found that in the flicker-eliminating mode, the exposure time of the image sensor cannot ...

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Abstract

Disclosed are an image flicker detection method and device, and an image capturing device. The image flicker detection method includes the following steps: carrying out exposure imaging on an imaging target under irradiation of a light source so as to form image frames; based on mean luminances of pixels of different rows in the image frames, judging whether relative motion of any two image frames exists in an exposure imaging process; if no relative motion exists, based on mean luminances of pixels in different rows in the two image frames, detecting whether flicker signals exist; and if the flicker signals exist, according to the detection result, determining the frequency of the flicker signals. The technical scheme solves a problem that the prior art is incapable of simply, rapidly and accurately detecting image flicker under a motion 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 commonly used image capture devices (such as digital video cameras, still cameras, etc.), a global shutter (global shutter) or a rolling shutter (rolling shutter) is generally used to control the exposure and imaging of an imaging target by an image sensor. Among them, for an image sensor controlled by a global shutter, all photosensitive devices receive light and expose at the same time. After the exposure is over, all photosensitive devices stop receiving light and convert the exposed image into a digital image. Different from global shutter control, for image sensors using rolling shutter control, all photosensitive devices are exposed sequentially in row order. Because of this exposure method, there is a time difference between the photosensitive devices o...

Claims

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Application Information

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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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