Why do I get these error message ?

EyeDetect = vision.CascadeObjectDetector('EyePairBig');
% Read input image
I = imread('Photo.jpg');
subplot(1,2,1), imshow(I);
% Create bounding box
BB = step(EyeDetect, I);
rectangle('Position', BB, 'LineWidth', 3, 'LineStyle', '-', 'EdgeColor','r');
title('Eyes Detection');
Eyes = imcrop(I,BB);
subplot(1,2,2), imshow(Eyes);
title('Cropped Eyes')

Error message
>> EyeDetection
Error using rectangle
Value must be a 4 element vector

Error in EyeDetection (line 9)
rectangle('Position', BB, 'LineWidth', 3, 'LineStyle', '-', 'EdgeColor','r');

[dpb]

Because the returned region isn't a 4-vector in BB.

We have no way to know what it actually is -- perhaps either empty if the algorithm failed to find the desired features or alternatively, an Mx4 array if there were more than one region detected.

Set a breakpoint and use the debugger to see or display the image and label the regions returned as in the example in the documentation to see what actually was found...

Answer 1

[Himanshu tripathi]

Try this

for i = 1:size(BB,1)
    rectangle('Position',BB(i,:),'LineWidth',3,'LineStyle','-','EdgeColor','r');
end

[Chidiebere Ike]

% Object Detector
EyeDetect = vision.CascadeObjectDetector('EyePairBig');
% Read input image
I = imread('Photo.jpg');
subplot(1,2,1), imshow(I);
% Create bounding box
BB = step(EyeDetect, I);
for i = 1:size(BB,1)
    rectangle('Position',BB(i,:),'LineWidth',3,'LineStyle','-','EdgeColor','r');
end
title('Eyes Detection');
Eyes = imcrop(I,BB);
subplot(1,2,2), imshow(Eyes);
title('Cropped Eyes')

Thanks for your feedback, I appreciate. I still get an error. See attached photo. Thanks