Medical Image Retrieval: Past and Present
Kyung Hoon Hwang, Haejun Lee, Duck-Joo Choi · Healthcare Informatics Research · 2012
manage images are used.In content-based image retrieval, the images are retrieved on the basis of features such as color, texture, shape, and so on, which were derived from the images themselves.So far, a variety of medical image retrieval systems have been developed using either method (text-based or contentbased) or combining two methods; a rough classification of medical image retrieval methods is displayed in Figure 1.Therefore, we described two technological approaches for medical image retrieval -past development and present status, and future perspectives. II. Text-Based Medical Image RetrievalText-based image retrieval system can be traced back to 1970s.Text-based image retrieval system is prevalent in the search on the internet web browsers.Although text-based methods are fast and reliable when images are well annotated, they cannot search in unannotated image databases.Moreover, text-based image retrieval has the following additional drawbacks, it requires time-consuming annotation procedures and the annotation is subjective [2].Text-based query commonly results in irrelevant images (Figure 2).Thus, to support effective image searching, retrieval methods based on the image content were developed.