关键词: 特征提取, 图像相似度, 欧氏距离, 自动评阅

Abstract: Aiming at the problem that the PhotoShop subjective examination questions can not realize the machine marking, it uses the method of image similarity comparison to conduct PS marking. The similarity degree is compared by extracting the feature histogram of the image, the transverse and the longitudinal similarity between the three images are defined, and the Euclidean distance normalization algorithm based on the distance triangle of similarity degree is proposed. This algorithm can calculate the similarity of the candidate is graph with respect to the color, edge, and texture of the original graph and the standard answer graph respectively, thus giving the actual score of the examinee. Experimental results show that the method is reasonable. In practical application, the weight of corresponding feature similarity can be adjusted according to the emphasis of examination on corresponding skills.

Key words: feature extraction, image similarity, Euclidean distance, automatic grading