METHOD FOR ACQUIRING COMPACT GLOBAL FEATURE DESCRIPTOR OF IMAGE AND IMAGE RETRIEVAL METHOD

摘要

Provided are a method for acquiring a compact global feature descriptor of an image and an image retrieval method. The method comprises: acquiring at least one local feature descriptor of an image, selecting one or more local feature descriptors from all the local feature descriptors, and performing dimension reduction on the selected local feature descriptor, so as to obtain the local feature descriptor after dimension reduction; according to a first rule, converting the local feature descriptor after dimension reduction into a global feature descriptor which is used for expressing a visual feature of the image; and performing data compression on the global feature descriptor, so as to obtain a compact global feature descriptor of the image, wherein the byte size of the global feature descriptor can change according to the change of a parameter value in the first rule. A global visual feature acquired by using the above-mentioned method is more compact and has scalability, thereby overcoming the defect in the prior art that a space in a mobile terminal with low memory is insufficient.