Image area extraction method, image reconstruction method using the extraction result and apparatus thereof
First Claim
1. A method of extracting an image area of interest in an inputted image comprising the steps of:
- acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the inputted image; 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.
40 Citations
38 Claims
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1. A method of extracting an image area of interest in an inputted image comprising the steps of:
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acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the inputted image; 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, 6, 7, 8, 18, 19)
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9. A method of reconstructing an image from inputted compressed image data comprising the steps of:
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extracting an image area of interest in an inputted image having said inputted compressed image data; and
reconstructing an image with correction of image data in the image area of interest to a predetermined value, wherein said extracting step comprising the steps of;
acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the inputted compressed image data; and
searching for an image area of interest in an inputted image using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 20, 21)
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22. An image processing apparatus of extracting an image area of interest in an inputted image comprising:
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first acquiring means for acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the inputted image; and
searching means for searching for the image area of interest in the inputted image using the spatial frequency information and chromaticity information acquired by said first acquiring means. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. An image processing apparatus for reconstructing an image from inputted compressed image data comprising:
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extracting means for extracting an image area of interest in an inputted image having said inputted compressed image data; and
reconstructing means for reconstructing an image with correction of image data in the image area of interest to a predetermined value, wherein said extracting means comprising;
first acquiring means for acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the inputted compressed image data; and
searching means for searching for an image area of interest in an inputted image using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification