Kernel Descriptors for Visual Recognition
The hard binning underlying Eq. 1 is only for ease of presentation. To get a kernel view of soft binning [13], we only need to replace the delta function in Eq. 1 by the following, soft –(¢) function: –i(z) = max(cos(µ(z)¡ai)9;0) (4) where a(i) is the center of the i¡th bin. In addition, one can easily include soft spatial binning by
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