Cropping the Image Bounding Boxes

Hello everyone. I wanted to crop the region of interest(ROI) from set of images, let say image a,b and c based on the provided bounding box information. For your information, different image has different bounding box sizes.

The first step I did was, I import the txt file containing bounding box information and save it as table matrix, named as bbtrycrop1.mat. Please see the attachment referring this file.

Then, I read those images from a folder, followed by cropping the bounding box x1,y1,x2,y2 using imcrop function.

However, it was unsuccessful after several times attempts fixing the following codes.

I need any kind of assistance regarding this..Many thanks in advance.

Here is the codes:

    if true
      % code
      srcFiles = dir('D:\Phd Study\Lab work-object detection\extractboundingbox\trycrop\*.jpg'); 
      load bbcrop1.mat 

      for i = 1 : length(srcFiles)
      filename = strcat('D:\Phd Study\Lab work-object detection\extractboundingbox\trycrop\',srcFiles(i).name);
      I = imread(filename);

      j=size(bbtrycrop1,1);
      for b = 1 : length(j)
      line1=bbtrycrop1(1,:);
      x1=line1(:,2);
      y1=line1(:,3);
      x2=line1(:,4);
      y2=line1(:,5);

      I2{b} = imcrop(I,[x1 y1 x2 y2]);

      end 
     end

[Massimo Zanetti]

The vector defining the crop size and position is NOT of the type

[x1 y1 x2 y2]

but instead

[xmin ymin width height]

You have to provide top-left corner point and size of the crop window.