Image processing apparatus, method, and program

a technology of image processing and apparatus, applied in the field of image processing methods, can solve the problems of image quality degradation, inability to completely eliminate overshooting or undershooting adjacent to an edge, etc., and achieve the effect of high quality
US20090278957A1Inactive Publication Date: 2009-11-12FUJIFILM CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
FUJIFILM CORP
Publication Date
2009-11-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

An image processing apparatus, including a region setting unit for setting regions on a processing target image in which each pixel of the image is included according to a level of each pixel, a low frequency image generation unit for generating a low frequency image of the processing target image, a gain calculation unit for calculating a gain for each pixel of the processing target image such that the lower the level the greater the gain, wherein the unit calculates the gain such that pixels in each of the regions in which each pixel of the processing target image is included have substantially the same gain based on a region setting result and a level of each pixel of the low frequency image, and a processing unit for generating a processed image by performing dynamic range compression on the processing target image based on the gain.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an image processing method and apparatus for compressing the dynamic range of an image by changing the gain of the image. The invention also relates to a computer readable recording medium on which is recorded a program for causing a computer to perform the image processing method.

[0003] 2. Description of the Related Art

[0004] Reproduction of images after performing appropriate image processing is common practice in various fields. For example, a dynamic range compression method is proposed. The method generates a low frequency image of an image and reduces the contrast of a high luminance region, a low luminance region, or the entire image such that the difference between the maximum luminance value and minimum luminance value, i.e., dynamic range is reduced using the low frequency image. More specifically, a low frequency image of an image is generated, then a gain is calculated from the...

Claims

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