Flicker reduction method, image pickup device, and flicker reduction circuit

A technology for image pickup devices and image pickup components, which is applied in image communication, television, electrical components, etc., can solve problems such as image pickup devices, complex systems, and unsuitability for shooting moving images, and achieve the effect of reducing flicker components

Inactive Publication Date: 2005-12-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0031] Like the technique disclosed in Patent Document 3, the following technique disclosed in Patent Document 5—estimating flicker components by taking two types of images at different timings—requires a complicated system in the image pickup device, and this technique is not suitable for Take moving pictures

Method used

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  • Flicker reduction method, image pickup device, and flicker reduction circuit
  • Flicker reduction method, image pickup device, and flicker reduction circuit
  • Flicker reduction method, image pickup device, and flicker reduction circuit

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Embodiment Construction

[0084] [image pickup device embodiment: Fig. 1-Fig. 3]

[0085] (System configuration: Figure 1)

[0086] FIG. 1 shows a system configuration of one embodiment of an image pickup apparatus according to the present invention. The image pickup device here is a video camera employing a CMOS image pickup element as an XY addressing type scanning image pickup element.

[0087] In the video camera as an image pickup device of this embodiment, light from a subject is incident on a CMOS image pickup device 12 through an image pickup optical system 11, and is photoelectrically converted into an analog video signal by the CMOS image pickup device 12. A resulting analog video signal is thus obtained from the CMOS image pickup device 12 .

[0088] The CMOS image pickup device 12 includes a plurality of two-dimensionally arranged pixels, a vertical scanning circuit, a horizontal scanning circuit, and a video signal output circuit on a CMOS substrate, and each pixel includes a photodiode ...

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Abstract

On the premise of using only simple signal processing without using a photodetector, it is possible to detect with high accuracy regardless of the subject, video signal level, and type of fluorescent lamp Fluorescent flicker is inherent and reliably substantially reduced. The signal In'(x, y) is an RGB primary color signal including a flicker component or a luminance signal. The signal In'(x, y) is integrated for time over one horizontal period, and the difference value of the integrated value of adjacent fields is normalized by the mean value of the integrated value in three consecutive fields. The normalized difference value gn(y) undergoes discrete Fourier transform to extract the spectrum. From the extracted spectrum, the scintillation coefficient Γn(y) is estimated for the calculation of In'(x, y) / [1+Γn(y)].

Description

technical field [0001] The present invention relates to a method for reducing the noise from an XY addressing type scanning image pickup element (imager or image sensor) such as a CMOS (Complementary Metal Oxide Semiconductor) image pickup element when the image pickup element captures an object under fluorescent light. ), an image pickup device such as a digital camera or video camera employing said XY addressing type scanning image pickup element (for example, said CMOS image pickup element), and a method for The flicker reducing circuit of the image pickup device. Background technique [0002] When the camera shoots the subject under the illumination of the fluorescent lamp directly operated by the mains AC power supply, since the frequency of the luminance change (light intensity change) of the fluorescent lamp (twice the frequency of the mains AC power supply) is perpendicular to the camera The difference between the sync frequencies, the brightness level variation in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/335
Inventor 木下雅也中村真备田中健二
Owner SONY CORP
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