| 摘要 |
A compressed and encoded image is compared with a specific image to determine whether they are identical to the specific image, without completely decoding the compressed and encoded images. An image substantially identical to a specific image is retrieved from compressed and encoded video contents, without completely decoding the compressed and encoded video contents. The present invention provides an image-comparing apparatus for comparing a code stream obtained by encoding a retrieved image, with a specific image, thereby to determine whether the code stream is substantially identical to the specific image, the apparatus including an image-characteristic amount extracting section that analyzes the code stream, thereby to extract an image-characteristic amount of the retrieved image, an encoding-parameter extracting section that extracts an encoding parameter from the code stream, an encoded-data generating section that encodes the specific image to some extent, on the basis of the encoding parameter, thereby to generate encoded specific-image data, and a comparing section that compares the image-characteristic amount of the retrieved image with the encoded specific-image data, thereby to determine whether the code stream is substantially identical to the specific image.
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