多读书总是没错的，当初死活不知道答案的问题，早上翻了一眼书，看到答案了。
384维GIST特征提取参数：we use Gabor filter with 8 orientations and 3 scales, leading to 384-dimensional vector.
1152维HOG特征：we compute the image gradients of non-overlapping windows, where the orientation of gradients is quantized into 8 bins and normalized with 4 different metrics, and 36 4-by-4 non-overlapping windows yield 1152-dimensional vectors.
