Image feature compression method and device, image feature decompression method and device, storage medium and electronic equipment

The invention provides an image feature compression method and device, an image feature decompression method and device, a storage medium and electronic equipment, and relates to the technical field of image coding. The image feature compression method comprises the following steps: obtaining feature data of an image to be compressed; carrying out blocking on the feature data; performing discrete cosine transform (DCT) on the feature data in each block to obtain a DCT coefficient in each block; calculating a basic quantization step size according to the DCT coefficient and a quantization interval of the DCT coefficient; determining the quantization step size of the DCT coefficient at each position in each block according to the basic quantization step size and the step size multiplying power corresponding to the target quantization table; and quantizing the DCT coefficient in each block according to the quantization step size of the DCT coefficient at each position in each block. The problem that the quantiza