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harris角点检测与ncc匹配(Harris corner detection and NCC matching)
harris角点检测与ncc匹配(Harris corner detection and NCC matching) Harris corner detection and NCC matching File1:-------------------------------------------------------------------------------------- Function, [y1, Y2, R, c]=harris (X) % corner detection using the Harris algorithm % output is an image % [result, CNT, R, c]=harris (X) % CLC, clear all; % filename=qiao1.bmp; % X= imread (filename.bmp);% reads the image % Info=imfinfo (filename);%; this is customary % f=rgb2gray (X); F=X; % Ori_im=double (f) /255;%unit8 is converted to 64 double precision double64 FX = [-2, -1 01, 2],% X direction gradient operator (for Harris corner extraction algorithm) Ix = Filter2 (FX, ori_im);% x directional filtering is good at using filter % FY = [5 85; 000; -5, -8, -5];% Gauss function, first order differential, Y direction (for improved Harris corner extraction algorithm) FY = [-2; -1; 0; 1; 2];% Y direction gradient operator (used in Harris corner extraction algorithm) Iy = Filter2 (FY, ori_im);% y directional filtering Ix2 = Ix.^2; Iy2 = Iy.^2; Ixy = Ix.*Iy; Clear Ix; Clear Iy =% elimination variable ha H=, fspecial (gaussian, [10, 10], 2);% produces Gauss window functions of 7*7, sigma=2 Ix2 = Filter2 (h, Ix2); Iy2 = Filter2 (h, Iy2); Ixy = Filter2 (h, Ixy);% Gauss filtering, respectively Height = size (ori_im, 1); Width = size (ori_im, 2); Result = zeros (height, width);% record corner position, corner value is 1, background is black ha R = zeros (height, width); Rmax = 0;% the maximum R value in the image in order to set the threshold For I = 1:height For J = 1:width M = [Ix2 (I, J), Ixy (I, J); Ixy (I, J), Iy2 (I, J)];%2*2 matrix R (I, J) = det (M) -0.06* (trace (M)) ^2;% calculates R and obtains RMAX, which appears to be the whole, and the corner response function If R (I, J) Rmax Rmax = R (I, J); End; End; End; CNT = 0;% record count For I = 2:height-1 For J = 2:width-1% carry on non maximum suppression, window 3*3 If R (I, J) 0.01*Rmax R (I, J) R (i-1, J-1) and R (I, J)
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