Edge Image Description Using Angular Radial Partitioning PDF
Preview Edge Image Description Using Angular Radial Partitioning
Edge Image Description Using Angular Radial Partitioning A.Chalechale, A. Mertins and G. Naghdy IEE Proc.-Vis. Image Signal Processing, 2004 Slides by David Anthony Torres Computer Science and Engineering — University of California at San Diego Angular Radial Partitioning • Partition edge map into Image: I(ρ,θ) angular and radial bin. • Partition into M (cid:215)N bins ! M radial parts ! N angular parts • Index a bin by (k,i) ρ=kR/M, k =1..M θ=2πi/N, i =1..N Angular Radial Partitioning • Sector feature f(k,i) = # edge pixels in (k,i) • A feature f(k,i) is shifted when we rotate by τ= π = 2 l / N for l 0,1, 2,... Angular Radial Partitioning • Denote image rotation by I (ρ,θ) = I(ρ,θ-τ) τ • Feature rotates as well f (k,i) = f(k,i-l) τ Take 1-D Fourier Transform • • Take 1-D Fourier Transform Take 1-D Fourier Transform Take 1-D Fourier Transform Rotational Invariance Transforms contain rotational invariance • ower-spectra are the same • Because their p • Choose {||F(k,u)||} for k=0..M-1 and u=0..N-1 as image features.
Description:The list of books you might like
