| 摘要 |
Image feature extraction includes extracting an cutout image that includes an object from an original image; filling borders of the cutout image with a single color as a background to generate a minimum square image; resizing the minimum square image into a resized square image having a first predetermined size; dividing the resized square image into sub-image blocks having a second predetermined size; computing luminosity derivatives of neighboring pixels in horizontal, vertical, positive 45°, and negative 45° directions for each of the sub-image blocks; obtaining a quintuplet characteristic vector for each of the sub-image block; and forming an image characteristic vector of the original image using the quintuplet characteristic vectors of all the sub-image blocks.
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