Question

Sift is used for identification of specific objects


b. hog is used for classification

Answer 1

Scale Invariant Feature Transform (SIFT) is used in Computer vision as an algorithm in order to detect and describe the local feature of an image.

There are many technologies in which the application of SIFT can be seen including Robotic Mapping, 3D Modelling, Object Recognition, etc.

Histogram of Oriented Gradients (HOG) is also a part of computer vision used as a feature descriptor in the image processing to detect an object.