Image processing device, method, medium and system

The invention provides an image processing device, and the device comprises: a feature extraction model building module, which is used for obtaining a feature extraction model through a first group of images; a feature extraction module, which is used for extracting features of the second group of images by using a feature extraction model; a similarity calculation module, which is used for acquiring the similarity between the features of the first group of images and the features of the second group of images; and a sample image selection module, which is used for selecting a third group of images from the second group of images, wherein the similarity between the features of the third group of images and the features of the first group of images is within a first preset range, and the feature extraction model establishment module is further used for training a feature extraction model according to the third group of images. The image collection efficiency can be improved, the image collection cost can be re