java - The implementation of HOG Descriptor -


i trying implement hog descriptor using java without using hog descriptor implemented in opencv, have following questions:

  1. are hog detector , hog descriptor same?

  2. after extract interest points or key points image extract hog descriptor? form whole image or interest points / key points detected before image.

  3. when compute gradient divide image blocks before or after compute image gradient?

regards in advance

well,

  1. i haven't used hog judging other descriptors, not same. actual feature descriptor while detector can guess used detect (to locate) feature.
  2. there no point in finding interesting points , extract features whole image. (again) don't know how hog work either extract features whole image or first detect interesting points , extract them. (some features cannot extracted whole image though).
  3. judging answers in wikipedia usual approach involves calculation of local features , use blocks group cells larger, spatially connected blocks improve illumination etc robustness, first calculate hog on cell level , use block groug them together.

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