Interpolation processing apparatus and recording medium having interpolation processing program recorded therein

a processing apparatus and recording medium technology, applied in the field of interpolation processing apparatus and recording medium having interpolation processing program recorded therein, can solve the problems of not being suited to processing a still image that requires high definition, chromatic aberration in magnification of lenses, and color artifacts in color images obtained

Inactive Publication Date: 2002-01-03
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optical systems such as lenses are known to manifest magnification chromatic aberration.
In other words, the art disclosed in U.S. Pat. No. 5,629,734 poses a problem in that color artifacts occur in the color image obtained through the interpolation processing due to a magnification chromatic aberration.
However, while the interpolation processing implemented as described above is effective in restoring the image quality in a dynamic image, it is not suited for processing a still image that requires high definition.
In addition, since the luminance component Y is interpolated by using the median, the likelihood of the image structure becoming lost is high.
Furthermore, there is a concern that color artifacts may spread when the data are converted to the RGB calorimetric system.
However, this RB interpolation processing poses a problem in that the color artifact is allowed to remain in the vicinity of an isolated point (an image area manifesting only slight similarity to nearby pixels and having a high spatial frequency).
Furthermore, the risk of the fine structure in a colored area (hereafter referred to as a "color structure") being lost is higher when the filter size in the median processing is increased.

Method used

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  • Interpolation processing apparatus and recording medium having interpolation processing program recorded therein
  • Interpolation processing apparatus and recording medium having interpolation processing program recorded therein
  • Interpolation processing apparatus and recording medium having interpolation processing program recorded therein

Examples

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Comparison scheme
Effect test

example 2

.alpha. red : .alpha. green : .alpha. blue=1:1:0, .beta. red : .beta. green=1:1 and kr1: kr2 : kr3=0:1:0.

[0265] Through these settings, the local curvature information based upon the blue color component which prevents an over correction attributable to the local curvature information based upon the red color component when similarity manifests along the diagonal direction in the first embodiment is all substituted with local curvature information based upon the green color component. Thus, by adopting the settings in example 2, the need for making a judgment with regard to similarity manifesting along the diagonal directions is eliminated to simplify the algorithm and, at the same time, the extraction of structural information at a sufficient level is achieved while preventing over correction.

example 3

.alpha. red : .alpha. green : .alpha. blue=0:1:0, .beta. red : .beta. green=0:1 and kr1: kr2 : kr3=setting not required

[0266] By adopting these settings, the local curvature information based upon the green color component used to prevent over correction of the red color component in example 2 is now used as the main element in the correctional term. The structural information can be extracted even when the correctional term is constituted only of the curvature information based upon the green color component. This means that the curvature information based upon the green color component, too, contains a great deal of structural information equivalent to the curvature information based upon the red color component that passes through the center. In addition, by adopting the settings in example 3, a correction is performed with local curvature information based upon the same color component, i.e., the green color component, as the color component of the average information constituti...

example 4

.alpha. red : .alpha. green : .alpha. blue=0:0:1, .beta. red : .beta.green=0:1 and kr1: kr2 : kr3=setting not required

[0267] The relationship of this example to the first embodiment is similar to the relationship between example 2 and example 3, and by adopting these settings, the curvature information based upon the color component used to prevent an over correction of the local curvature information based upon the red color component is now utilized as the main element in the correctional term. While it is not possible to prevent over correction attributable to local curvature information based upon the blue color component through the settings in example 4, advantages comparable to those in the first embodiment are achieved with regard to the extractions of the local structural information.

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Abstract

A first interpolation processing apparatus that engages in processing on image data which are provided in a calorimetric system constituted of first~nth (n>=2) color components and include color information corresponding to a single color component provided at each pixel to determine an interpolation value equivalent to color information corresponding to the first color component for a pixel at which the first color component is missing, includes: an interpolation value calculation section that uses color information at pixels located in a local area containing an interpolation target pixel to undergo interpolation processing to calculate an interpolation value including, at least (1) local average information of the first color component with regard to the interpolation target pixel and (2) local curvature information corresponding to at least two color components with regard to the interpolation target pixel.

Description

[0001] This application is a continuation of International Application No. PCT / JP00 / 09040 filed Dec. 20, 2000.INCORPORATION BY REFERENCE[0002] The disclosures of following applications are herein incorporated by reference: Japanese Patent Application No. H11-363007 filed Dec. 21, 1999; Japanese Patent Application No. 2000-204768 filed Jul. 6, 2000; and International Application No. PCT / JPOO / 09040 filed Dec. 20, 2000.[0003] 1. Field of the Invention[0004] The present invention relates to an interpolation processing apparatus that engages in interpolation processing on color image data to supplement a color component and a luminance component missing in pixels and a recording medium having an interpolation processing program for achieving the interpolation processing on a computer, that can be read by a computer.[0005] 2. Description of the Related Art[0006] Some electronic cameras generate color image data by employing an image-capturing sensor having three color (R, G and B.: red, g...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06T3/40G06T1/00G06T5/00G06T5/20G06T7/00H04N1/46H04N1/60H04N9/04H04N9/07
CPCG06T3/4007G06T3/4015G06T5/20H04N9/045H04N23/843H04N25/134
Inventor CHEN, ZHE-HONGISHIGA, KENICHI
Owner NIKON CORP
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