A Study on Lung Image Retrieval Based on the Vocabulary Tree

Nowadays, the image retrieval technology has aroused the wide concern and achieved the significant effect in the area of medical image retrieval. However, the traditional image retrieval method based on the image bottom-layer features is inefficient. With the increase in the volume of retrieval data, its shortcoming has become obvious. To promote the accuracy of retrieval, Scaleinvariant feature transform (SIFT) lung feature extraction algorithm was chosen as the descriptor in this study. For such case, the method of vocabulary tree was introduced to extract the recognition features of lung image, as well as the medical retrieval of lung images using the obtained features. In the development environment of MATLAB, the reading, storage and retrieval of medical images were performed to create a full set of algorithmic retrieval system finally. The vocabulary tree-based retrieval method and the medical image processing were employed to denoise the images, SIFT extraction to extract the image features, K-means clustering that mapped to the feature space to turn the extracted features into the vocabulary tree. According to the experimental results, the algorithm proposed in this study is able to achieve good results.