Image retrieval method and system, electronic equipment and medium

The invention relates to an image retrieval method and system, electronic equipment and a medium. The method comprises the following steps: detecting N stable key points of each sample image, and performing feature extraction on each key point to obtain N * D1 local feature descriptors; product quantization is carried out on the N * D1 feature descriptors, namely, the D1 dimension is divided into m1 sub-segments, and the sub-dimension D1/m1 of each segment and the local feature descriptors N * D1/m1 of each segment are obtained; clustering D1/m1 feature descriptors in each segment, and setting a clustering number K1 to obtain K1 clustering centers of D1/m1 dimensions of each sub-segment; quantizing the feature vector of each key point in the N key points into a D1/m1-dimensional short vector, wherein each element in the short vector is a clustering center ID to which the sub-segment belongs; an image identifier of a sample image containing a clustering center ID is recorded for each clustering center ID, and