用于多人检测的滑动窗口技术

我正在开发用于检测人员的视频监视应用程序。目前我正在执行HOG描述符作为检测器。但是，我有一个关于滑动窗口技术的问题。我的代码只能检测到单个人。我还使用MexOpen CV中的组矩形创建多个边界框。任何人都有想法如何编写滑动窗口技术来检测多个对象？谢谢。用于多人检测的滑动窗口技术

 % Reading the image 
     im = strcat ('C:\Users\Documents\MATLAB\HOG\HOG\images\16.bmp'); 
     im = imread (im); 

     win_size= [64, 128]; 

     [lastRightCol lastRightRow d] = size(im); 

     counter = 1; 
     %% Scan the window by using sliding window object detection 

     % this for loop scan the entire image and extract features for each sliding window 
     % Loop on scales (based on size of the window) 
     for s=1:0.5:3 
      disp(strcat('s is',num2str(s))); 
      X=win_size(1)*s; 
      Y=win_size(2)*s; 
      for y = 1:X/4:lastRightCol-Y 
       for x = 1:Y/4:lastRightRow-X 
        p1 = [x,y]; 
        p2 = [x+(X-1), y+(Y-1)]; 
        po = [p1; p2] ; 

        % Croped image and scan it. 
        crop_px = [po(1,1) po(2,1)]; 
        crop_py = [po(1,2) po(2,2)]; 

        topLeftRow = ceil(min(crop_px)); 
        topLeftCol = ceil(min(crop_py)); 

        bottomRightRow = ceil(max(crop_px)); 
        bottomRightCol = ceil(max(crop_py)); 

        cropedImage = img(topLeftCol:bottomRightCol,topLeftRow:bottomRightRow,:); 

        % Get the feature vector from croped image using HOG descriptor 
        featureVector{counter} = getHOGDescriptor(img); 
        boxPoint{counter} = [x,y,X,Y]; 
        count = counter+1; 
        x = x+2; 
       end 
      end 
     end 

     label = ones(length(featureVector),1); 
     P = cell2mat(featureVector); 

     % each row of P' correspond to a window 
     % classifying each window 
     [~, predictions] = svmclassify(P', label,model); 


     % set the threshold for getting multiple detection 
     % the threshold value is 0.7 
     get_detect = predictions.*[predictions>0.6]; 

     % the the value after sorted 
     [r,c,v]= find(get_detect); 


     %% Creating the bounding box for detection 
     for ix=1:length(r) 
      rects{ix}= boxPoint{r(ix)}; 
     end 

     if (isempty(rects)) 
      rects2=[]; 
     else 
      rects2 = cv.groupRectangles(rects,3,'EPS',0.35); 
     end 



     for i = 1:numel(rects2) 
      rectangle('Position',[rects2{i}(1),rects2{i}(2),64,128], 'LineWidth',2,'EdgeColor','y'); 
     end 

    end

来源

2014-04-23 Indrasyach

请问您可以创建一个mcve。看到这个帮助：http://stackoverflow.com/help/mcve – kkuilla

噢抱歉，我忘记附上我的代码。这里我附上了上面的代码。 @kkuilla，希望你能帮助我。谢谢 – Indrasyach

测试图像在哪里？您还应该添加'computer-vision'标签。你使用函数getHOGDescriptor（）。你没有提到你正在使用哪一个。至少有两个你可以下载。 – kkuilla

计算机视觉系统工具箱包括vision.PeopleDetector对象，它使用一个滑动窗口生猪SVM算法。

来源

2014-04-26 01:50:03 Dima

感谢您的建议。但是，对于我的项目，我不允许使用任何MATLAB工具箱。我必须建立自己的代码。因此，在这里我发现了对多人检测进行滑动窗口检测的困难。 @Dima – Indrasyach

我不确定您是否正确测试模型。 Here你有一个完整的例子，这是滑动窗口的主要代码：

topLeftRow = 1; 
topLeftCol = 1; 
[bottomRightCol bottomRightRow d] = size(im); 

fcount = 1; 

% this for loop scan the entire image and extract features for each sliding window 
for y = topLeftCol:bottomRightCol-wSize(2) 
    for x = topLeftRow:bottomRightRow-wSize(1) 
     p1 = [x,y]; 
     p2 = [x+(wSize(1)-1), y+(wSize(2)-1)]; 
     po = [p1; p2]; 
     img = imcut(po,im);  
     featureVector{fcount} = HOG(double(img)); 
     boxPoint{fcount} = [x,y]; 
     fcount = fcount+1; 
     x = x+1; 
    end 
end 

lebel = ones(length(featureVector),1); 
P = cell2mat(featureVector); 
% each row of P' correspond to a window 
[~, predictions] = svmclassify(P',lebel,model); % classifying each window 

[a, indx]= max(predictions);

来源

2014-05-19 09:45:52 phyrox

用于多人检测的滑动窗口技术

回答

相关问题