Chapter 21. Image Retrieval(BOF)

영상 검색시 활용 BOW의 기본 아이디어 활용

• Tf-idf weight :

BOF - BOF document - image Words = features & descriptions Stem = visual words

• similar descriptor vectors
• Codebook (VQ, Mean shift…) Image Vector
• Histogram of visual words

Main approaches of image retrieval

• MPEG-7 : Color histogram
• Video google : SIFT/SURF feature

21.1 Color Histogram

21.2 BOF

feature 들의 histogram이 비슷한 것을 찾는것