Imaging device

a technology of image and pixel, applied in the field of image pixel, can solve the problems of fixed pattern noise, image line crawling (line-shaped or grid-like noise), and the difference in the sensitivity of each pixel

Inactive Publication Date: 2004-12-09
NIKON CORP
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Problems solved by technology

When shooting by a video camera or an electronic camera, there are cases where line crawling (line-shaped or grid-like noise) occurs in an image.
A cause of the occurrence of the line crawling is fixed pattern noise, such as difference in the sensitivity of each pixel, difference in the output level of each vertical transfer line and the like in a color image sensor.
It is difficult, however, to effectively subject image data to the sharpness enhancing processing after being smoothed.
Therefore, it is difficult to obtain a fine image with sharpness from original image data with the line crawling.

Method used

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[0074] In this embodiment, the modified value of Gb is calculated in consideration of the foregoing reasons of the difference, on the basis of the pixel signals of four pixels with different colors which are vertically and horizontally adjacent to the green pixel corresponding to Gb (step S3). Then, Gb, which tends to be larger than Gr in general, is corrected to be smaller by use of the obtained modified value (step S4). Therefore, when a subject with even color is photographed, Gb is so corrected as to be equal to Gr. In other words, it is possible to suppress line crawling without smoothing an image.

[0075] Accordingly, when photographed image data is subjected to processing for suppressing striped noise according to this embodiment, image data after the processing is not smoothed. Thus, it is possible to effectively subject image data to edge enhancing processing. As a result, it is possible to obtain a fine image with sharpness.

[0076] In the step S2, the judging section 54 judg...

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Abstract

A color image sensor has a first, second, and third color component pixels. The third color component pixel includes more intensity information than the first and second color component pixels. A difference estimating section estimates difference in a signal level exerted on a pixel signal of the third color component pixel, using the pixel signal of a pixel peripheral to the third color component pixel. A correcting section corrects the pixel signal of the third color component pixel on the basis of the estimated difference. Accordingly, when the third color component is green in a Bayer array, a pixel signal of a green pixel in a row of red pixels becomes equal to the pixel signal of a green pixel in a row of blue pixels. Therefore, line crawling can be suppressed without smoothing an image.

Description

[0001] This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2003-159459, filed on Jun. 4, 2003, the entire contents of which are incorporated herein by reference.[0002] 1. Field of the Invention[0003] The present invention relates to an imaging device. To be more specific, the present invention relates to image data processing to be performed on an output signal from a color image sensor in order to obtain a high quality image.[0004] 2. Description of the Related Art[0005] When shooting by a video camera or an electronic camera, there are cases where line crawling (line-shaped or grid-like noise) occurs in an image. A cause of the occurrence of the line crawling is fixed pattern noise, such as difference in the sensitivity of each pixel, difference in the output level of each vertical transfer line and the like in a color image sensor. A method for smoothing the image is known as a conventional art for making the line crawl...

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/225H04N9/07H04N9/00H04N9/04H04N101/00
CPCH04N9/045H04N25/611H04N25/134
Inventor SUZUKI, MASAHIRO
Owner NIKON CORP
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