Image area extraction method, image reconstruction method using the extraction result and apparatus thereof
First Claim
1. A method of recognizing an image area of interest in an inputted image comprising the steps of:
- receiving compressed image data for an inputted image;
acquiring spatial frequency information and chromaticity information which are generated in a process for reconstructing decompressed image data from the compressed image data; and
searching for the image area of interest in the inputted image using the acquired spatial frequency information and chromaticity information.
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Abstract
This invention has as its object to detect an image area of interest in an image file by a method with a lighter processing load by making determination using characteristics of a quantization table.
Since spatial frequency information, chromaticity information, and a quantization table are acquired for respective predetermined blocks from inputted compressed image data, and are used in combination upon searching the compression-recorded image data for an image of interest, information containing AC component information for each image data block is acquired without any advanced calculations, thus searching for the image of interest in the image file.
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Citations
10 Claims
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1. A method of recognizing an image area of interest in an inputted image comprising the steps of:
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receiving compressed image data for an inputted image; acquiring spatial frequency information and chromaticity information which are generated in a process for reconstructing decompressed image data from the compressed image data; and searching for the image area of interest in the inputted image using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (2, 3, 4, 5)
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6. An image processing apparatus for recognizing an image area of interest in an inputted image comprising:
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a receiving unit adapted to receive compressed image data for an inputted image; a first acquiring unit adapted to acquire spatial frequency information and chromaticity information which are generated in a process for reconstructing decompressed image data from the compressed image data; and a searching unit adapted to search for the image area of interest in the inputted image using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (7, 8, 9, 10)
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Specification