Band weighted colour histograms for image retrieval

摘要

A method of image retrieval from a target image collection, including segmenting a query image into two or more bands, obtaining weighted color histogram vectors for the two or more bands in the query image, and obtaining weighted color histogram vectors for two or more bands in a target image. A distance measurement is determined between the query image and the target image using the weighted color histogram vectors from corresponding bands in the query image and the target image. Bands in an image can be groups, strips, sections, regions, or the like, and can be linear bands, rectangular bands, circular bands, or the like. The bands are preferably, though not necessarily, concentric or otherwise aligned and any number of bands can be utilized. Also, content based image retrieval is provided that incorporates use of varying photo composition in different regions as a technique for improving accuracy of retrieval.

主权项

1. A computer-implemented method of image retrieval from a target image collection, the steps performed by a computer system and comprising:
segmenting a query image into two or more bands; obtaining weighted colour histogram vectors for the two or more bands in the query image; obtaining weighted colour histogram vectors for two or more bands in a target image; and, determining a distance measurement between the query image and the target image using the weighted colour histogram vectors from corresponding bands in the query image and the target image; wherein the distance measurement (D) between the query image (Iq) and the target image (Im) is determined using:D⁡(Iq,Im)=∑i=1N⁢⁢wi·di⁡(xqi,xni) where:
di is the individual distance measurement for selected corresponding bands between a colour histogram xq of the query image and a colour histogram xn of the target image; andwi is a weight applied to the ith colour histogram x.