Why do I get these error message ?

Question

Chidiebere Ike 2019-6-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/469289-why-do-i-get-these-error-message

评论： Chidiebere Ike 2019-6-30

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');

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dpb 2019-6-28

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...

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Answer 1

Himanshu tripathi 2019-6-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/469289-why-do-i-get-these-error-message#answer_381145

编辑：Himanshu tripathi 2019-6-28

在 MATLAB Online 中打开

Try this

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

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Chidiebere Ike 2019-6-30

在 MATLAB Online 中打开

Screenshot 2019-06-30 at 8.36.40 PM.png

% 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')