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Device for removing flicker through automatic detection and related method

An automatic and light detection technology, applied in color TV parts, TV system parts, TV and other directions, can solve the problem of inability to obtain power frequency information

Inactive Publication Date: 2011-10-12
CHIP GOAL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is that if you use a portable device such as a digital video camera, you will use the device's own power supply instead of the local power supply when using the device to take pictures, and you will not be able to obtain the frequency information of the local power supply to remove the flicker accordingly

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  • Device for removing flicker through automatic detection and related method
  • Device for removing flicker through automatic detection and related method
  • Device for removing flicker through automatic detection and related method

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Embodiment Construction

[0047] Please refer to Figure 1A , which shows a first embodiment of the invention. As shown in the figure, the device 100 for automatically detecting and removing flicker in this embodiment includes a light detection circuit 10 , a signal processing circuit 20 , and an automatic gain control circuit 30 . The light detection circuit 10 detects ambient light and generates a corresponding detection signal DS. The signal processing circuit 20 obtains the flicker frequency in the ambient light according to the detection signal DS output by the light detection circuit 10 . When the flicker frequency is known, a signal related to the ambient light frequency can be generated, such as a one-digit digital signal, indicating that the frequency is 50Hz or 60Hz, and the subsequent circuit can adjust the exposure time according to the switching signal to eliminate flicker . Alternatively, the signal related to the frequency of the ambient light can be a digital or analog signal with a f...

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Abstract

The invention provides a device for removing flickers through automatic detection and a related method. The device comprises a light detecting circuit, a signal processing circuit and an automatic gain control circuit, wherein the light detecting circuit detects environment light and generates a detection signal; the signal processing circuit is coupled with the light detecting circuit and generates a signal related to the frequency of the environment light and a feedback signal according to the detection signal; the automatic gain control circuit is coupled with the signal processing circuit, and generates a control signal according to the feedback signal for controlling the light detecting circuit in a feedback way to regulate the detection signal or controlling the signal processing circuit in the feedback way to regulate the signal related to the frequency of the environment light.

Description

technical field [0001] The present invention relates to a device and related method for automatic detection and removal of flicker, in particular to a device and related method for automatic detection and removal of flicker with automatic gain control. Background technique [0002] When the ambient light is not natural light but an indoor light source, flicker of 50 Hz or 60 Hz will be generated due to the frequency of the power supply. Therefore, in an image capture device (such as an image sensor), it is generally necessary to perform de-flicker processing to avoid different brightness levels of each frame. The general way to remove flicker is to adjust the exposure time to make it an integral multiple of 1 / 100 second when the power supply frequency is 50Hz, and to make it an integral multiple of 1 / 120 second when the power supply frequency is 60Hz. But the question is what frequency is the environment where the image capture device is applied to? In this regard, there a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
Inventor 洪尚铭黄健腾李敬洲蓝正丰林俊煌许浩铭
Owner CHIP GOAL ELECTRONICS