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Circuit for automatically sensing the flicking of image and method thereof

An image and automatic technology, applied in the detection circuit field, can solve the problem of image quality degradation and achieve the effect of reducing design complexity

Inactive Publication Date: 2011-11-23
ETRON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the flickering frequency of the indoor lighting is different from the default value, when the user previews the continuous images captured by the image sensor, the user will find that there are brighter flickering bands or darker flickering bands appearing in the continuous images , leading to a decrease in the quality of the image captured by the image sensor

Method used

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  • Circuit for automatically sensing the flicking of image and method thereof
  • Circuit for automatically sensing the flicking of image and method thereof
  • Circuit for automatically sensing the flicking of image and method thereof

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Embodiment Construction

[0015] Please refer to Figure 1A and Figure 1B , Figure 1A A schematic diagram illustrating a circuit 100 for automatically detecting image flicker according to an embodiment of the present invention, Figure 1B It is a schematic diagram illustrating that the image frame has a Bell pattern. The circuit 100 includes an image sensor 101 , an averaging unit 102 , a difference generating unit 104 , a memory 106 , a conversion unit 108 , a flicker detection unit 110 and an auto exposure unit 112 . The image sensor 101 is used to capture an image frame IF according to an exposure setting (for example, 50 Hz), wherein the width of the image frame IF is W pixels, the height of the image frame is H pixels, and the flicker frequency of the indoor lighting is 60Hz. However, the present invention is not limited to the exposure setting being 50 Hz and the flickering frequency of the indoor lighting being 60 Hz. The averaging unit 102 is coupled to the image sensor 101 for generating ...

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Abstract

The invention discloses a circuit for automatically sensing the flicking of images, which comprises an image sensor, an average unit, a difference generating unit, a conversion unit and a flicker detecting unit. The image sensor acquires an image picture and the average unit generates a brightness average valve according to the brightness valve sum of the specific pixel of each pixel column of the image picture. The difference generating unit generates a corresponding difference valve according to the brightness average value of each pixel column of two consecutive images. The conversion unit performs a discrete Fourier transform to generate a conversion result according to the above difference valve. The flicker detecting unit determines whether a flicker occurs in the two consecutive images or not to generate a sensing result according to the conversion result.

Description

technical field [0001] The invention relates to a detection circuit and its method, especially to a circuit and its method for automatically detecting image flicker. Background technique [0002] In the prior art, the manufacturer of the image sensor sets the exposure setting of the image sensor to a preset value before the image sensor leaves the factory. But because the flickering frequency of the indoor lighting changes with the frequency of different alternating currents, the preset value may be different from the flickering frequency of the indoor lighting. If the flickering frequency of the indoor lighting is different from the default value, when the user previews the continuous images captured by the image sensor, the user will find that there are brighter flickering bands or darker flickering bands appearing in the continuous images , leading to a decrease in the quality of the image captured by the image sensor. Contents of the invention [0003] An embodiment ...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/243
CPCH04N5/2353H04N23/73
Inventor 谢宏业
Owner ETRON TECH INC