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 from compressed image data through a process for reconstructing decompressed image data from the compressed image data, comprising the steps of:
- acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the compressed image data; and
searching for the image area of interest from the compressed image data using the acquired spatial frequency information and chromaticity information.
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Abstract
An image area of interest in an image file can be detected by a method with a relatively light processing load by making a 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
36 Claims
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1. A method of recognizing an image area of interest from compressed image data through a process for reconstructing decompressed image data from the compressed image data, comprising the steps of:
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acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the compressed image data; and searching for the image area of interest from the compressed image data using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of recognizing an image area of interest from compressed image data and decoding image data from the compressed image data, through a process for reconstructing decompressed image data from the compressed image data, comprising the steps of:
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recognizing an image area of interest from the compressed image data; and reconstructing an image with correction of image data in the image area of interest to a predetermined value, wherein said recognizing step comprises the steps of; acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the compressed image data; and searching for the image area of interest from the compressed image data using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An image processing apparatus for recognizing an image area of interest from compressed image data through a process for reconstructing decompressed image data from the compressed image data, comprising:
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acquiring means for acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the compressed image data; and searching means for searching for the image area of interest from the compressed image data using the spatial frequency information and chromaticity information acquired by said acquiring means. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. An image processing apparatus for recognizing an image area of interest from compressed image data and decoding image data from the compressed image data, through a process for reconstructing decompressed image data from the compressed image data, comprising:
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recognizing means for recognizing an image area of interest from the 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 recognizing means comprises; acquiring means for acquiring spatial frequency information and chromaticity information for respective predetermined blocks from the compressed image data; and searching means for searching for the image area of interest from the compressed image data using the acquired spatial frequency information and chromaticity information. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification