www.pudn.com > MatlabSIFT.zip > showfeatures.m

%///////////////////////////////////////////////////////////////////////////////////////////// 
% 
% showfeatures - visualize features generated by detect_features 
% Usage:  showfeatures(features,img) 
% 
% Parameters:   
%             
%            img :      original image 
%            features:  matrix generated by detect_features 
% 
% Returns:   nothing, generates figure 
% 
% Author:  
% Scott Ettinger 
% scott.m.ettinger@intel.com 
% 
% May 2002 
%///////////////////////////////////////////////////////////////////////////////////////////// 
 
function [] = showfeatures(features,img,num_flag) 
 
if ~exist('num_flag') 
    num_flag = 0; 
end 
 
figure(gcf); 
imagesc(img) 
hold on 
colormap gray 
 
for i=1:size(features,1) 
    x = features(i,1); 
    y = features(i,2); 
    sz = features(i,4); 
     
    if x>size(img,2) 
        x 
    end 
     
    if features(i,5) > 0        %check edge flag 
         
        if num_flag ~= 1 
            plot(x,y,'g+');         %draw box around real feature 
        else 
            text(x,y,sprintf('%d',i),'color','m'); 
        end 
         
        if abs(features(i,7))>1.8 
            drawbox(0,sz,x,y,[0 0 1]); 
        else 
            drawbox(0,sz,x,y,[0 .9 .2]); 
        end 
    else                        %draw as edge 
             
        ang = features(i,6); 
        px = [x-sz*cos(ang) x+sz*cos(ang)]; 
        py = [y-sz*sin(ang) y+sz*sin(ang)]; 
        plot(px,py,'r'); 
    end 
end 
 
hold off;