METHOD AND SYSTEM FOR IMAGE ANALYSIS

摘要

A method for processing an image, including: identifying a group of keypoints in the image; for each keypoint, calculating a corresponding descriptor array including plural array elements, each array element storing values taken by a corresponding color gradient histogram of a respective sub-region of the image in the neighborhood of the keypoint; for each keypoint, subdividing the descriptor array in at least two sub-arrays each including a respective number of elements of the descriptor array, and generating a compressed descriptor array including a corresponding compressed sub-array for each of the at least two sub-arrays, each compressed sub-array obtained by compressing the corresponding sub-array by vector quantization using a respective codebook; exploiting the compressed descriptor arrays of the keypoints for image analysis. For each keypoint of the group, the subdividing is based on correlation relationships among color gradient histograms with values stored in the elements of the descriptor array of each keypoint.

主权项

1. A method for processing an image, comprising:
identifying a group of keypoints in the image; for each keypoint of the group:
a) calculating a corresponding descriptor array including a plurality of array elements, each array element storing values taken by a corresponding color gradient histogram of a respective sub-region of the image in the neighborhood of the keypoint;b) subdividing the descriptor array in at least two sub-arrays, each sub-array comprising a respective number of elements of the descriptor array, andc) generating a compressed descriptor array comprising a corresponding compressed sub-array for each of said at least two sub-arrays, each compressed sub-array being obtained by compressing the corresponding sub-array of said at least two sub-arrays by means of vector quantization using a respective codebook; exploiting the compressed descriptor arrays of the keypoints of said group for analysing the image, wherein: for each keypoint of said group, the subdivision of the descriptor array in at least two sub-arrays is carried out based on correlation relationships among the color gradient histograms whose values are stored in the elements of the descriptor array of said each keypoint.