Image processing apparatus, imaging apparatus, image processing method, and computer program product

Abstract

An image-information obtaining unit (101) obtains image information. An image-component separating unit (102) separates the image information into luminance information and color information. An edge extracting unit (110) extracts edge information from the luminance information. A luminance-noise removing unit (105) removes noise from the luminance information. A color-noise removing unit (106) removes noise from the color information. An image-information synthesizing unit (107) synthesizes image information based on the edge information, the luminance information from which the noise is removed, and the color information from which the noise is removed.

Description

technical field [0001] The present invention relates to an image processing device, an imaging device, an image processing method and a computer program product. Background technique [0002] This application incorporates by reference the entire contents of Japanese priority application No. 2006-208063 filed in Japan on July 31, 2006 and Japanese priority application No. 2007-034532 filed in Japan on February 15, 2007. [0003] In recent years, in the field of digital still cameras (hereinafter referred to as "digital cameras"), an increase in the number of pixels of charge-coupled devices (CCDs) or imaging devices has been achieved. On the other hand, such an increase in the number of CCD pixels causes a problem of a decrease in the sensitivity of the CCD. [0004] In order to solve such a problem, an imaging device is disclosed in which pixels of a plurality of images are added (see Japanese Patent Application Laid-Open No. 2005-44915). In such an imaging device, pixels ...

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Problems solved by technology

However, if either the camera or the target moves, a positional deviation will disadvantageously occur

[0008] Also, in the technique disclosed in Japanese Patent Application Laid-Open No. 2005-303519, the pixel values ​​of adjacent pixels are added together, thereby causing a problem of lowering the resolution

[0009] Also, in the technique disclosed in Japanese Patent Application Laid-Open No. 2004-297731, although noise can be removed according to the imaging sensitivity, the edges of the image become blurred

For example, if the ISO is set to high when imaging in a lighted position, blurring can have a noticeable effect on the image even if there is less noise, causing the image to blur unnecessarily

[0010] Furthermore, in the technique disclosed in Japanese Patent Application Laid-Open No. 2004-297731, when the exposure time is short in imaging, color reproducibility and white balance deteriorate, and the color and brightness of the image are not improved even if noise is removed balance between

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