Error in the code

Hi,can you give how i can correct my error

this is my code:

boxPoints = imread('C:\images\ima1.bmp');
figure;
imshow(boxPoints);
title('Image of a Box');
sceneImage = imread('C:\images\im1.jpg');
figure;
imshow(sceneImage);
title('Image of a Cluttered Scene');
boxPoints =detectSURFFeatures(boxPoints);
scenePoints = detectSURFFeatures(sceneImage);
figure;
imshow(boxImage);
title('100 Strongest Feature Points from Box Image');
hold on;
plot(selectStrongest(boxPoints, 100));
figure;
imshow(sceneImage);
title('300 Strongest Feature Points from Scene Image');
hold on;
plot(selectStrongest(scenePoints, 300));
[boxFeatures, boxPoints] = extractFeatures(boxImage, boxPoints);
[sceneFeatures, scenePoints] = extractFeatures(sceneImage, scenePoints);
boxPairs = matchFeatures(boxFeatures, sceneFeatures);
matchedBoxPoints = boxPoints(boxPairs(:, 1), :);
matchedScenePoints = scenePoints(boxPairs(:, 2), :);
figure;
showMatchedFeatures(boxImage, sceneImage, matchedBoxPoints, ...
    matchedScenePoints, 'montage');
title('Putatively Matched Points (Including Outliers)');
[tform, inlierBoxPoints, inlierScenePoints] = ...
    estimateGeometricTransform(matchedBoxPoints, matchedScenePoints, 'affine');
figure;
showMatchedFeatures(boxImage, sceneImage, inlierBoxPoints, ...
    inlierScenePoints, 'montage');
title('Matched Points (Inliers Only)');
boxPolygon = [1, 1;...                           % top-left
        size(boxImage, 2), 1;...                 % top-right
        size(boxImage, 2), size(boxImage, 1);... % bottom-right
        1, size(boxImage, 1);...                 % bottom-left
        1, 1];                   % top-left again to close the polygon
newBoxPolygon = transformPointsForward(tform, boxPolygon);
figure;
imshow(sceneImage);
hold on;
line(newBoxPolygon(:, 1), newBoxPolygon(:, 2), 'Color', 'y');
title('Detected Box');

And this is the error:

Error in detectSURFFeatures (line 81)
checkImage(I);

Error in Untitled2 (line 1)
boxPoints = detectSURFFeatures(boxImage);

[Ced]

Hi

First things first:

There is a little "{} Code" symbol when you write posts to make code readable. Oh, and it's usually good practice to start a new line for each command. From your error, I gather that you have most of them on a single line. That defeats the point of line information when debugging.

But as the error says, there is a problem in function "detectSURFFeatures", which you call with "boxPoints". In this function, you call another function called "checkImage" in line 81. That's all we can say for now.

[ahmed abdelbakey]

boxImage = imread('C:\Users\ahmed abdel bakey\Desktop\New folder\8.jpg');
boxImage=rgb2gray(boxImage);
figure;
imshow(boxImage);

title('Image of a Box');
sceneImage = imread('C:\Users\ahmed abdel bakey\Desktop\New folder\9.jpg');
sceneImage=rgb2gray(sceneImage);

figure;
imshow(sceneImage);
title('Image of a Cluttered Scene');
boxPoints = detectSURFFeatures(boxImage);
scenePoints = detectSURFFeatures(sceneImage);
figure;
imshow(boxImage);
title('100 Strongest Feature Points from Box Image');
hold on;
plot(selectStrongest(boxPoints, 100));
figure;
imshow(sceneImage);
title('300 Strongest Feature Points from Scene Image');
hold on;
plot(selectStrongest(scenePoints, 300));
[boxFeatures, boxPoints] = extractFeatures(boxImage, boxPoints);
[sceneFeatures, scenePoints] = extractFeatures(sceneImage, scenePoints);
boxPairs = matchFeatures(boxFeatures, sceneFeatures);

matchedBoxPoints = boxPoints(boxPairs(:, 1), :);

matchedScenePoints = scenePoints(boxPairs(:, 2), :);
figure;
showMatchedFeatures(boxImage, sceneImage, matchedBoxPoints, ...
matchedScenePoints, 'montage');
[tform, inlierBoxPoints, inlierScenePoints] =...
    EstimateGeometricTransform(matchedBoxPoints,matchedScenePoints,'affine');

showMatchedFeatures(boxImage, sceneImage, inlierBoxPoints, ...
inlierScenePoints, 'montage');

title('Matched Points (Inliers Only)');
boxPolygon = [1, 1;... % top-left
size(boxImage, 2), 1;... % top-right
size(boxImage, 2), size(boxImage, 1);... % bottom-right
1, size(boxImage, 1);... % bottom-left
1, 1]; % top-left again to close the polygon
newBoxPolygon = transformPointsForward(tform, boxPolygon);

figure;
imshow(sceneImage);
hold on;
line(newBoxPolygon(:, 1), newBoxPolygon(:, 2), 'Color', 'y');
title('Detected Box');

error EstimateGeometricTransform(matchedBoxPoints,matchedScenePoints,'affine');

how can solve it

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205#answer_18099

Start your own question and attach your code and images(s) with the paper clip icon.

Answer 1

[Image Analyst]

boxImage is supposed to be gray scale or binary. You just read it in from a BMP image so it's probably color. Try this and see if it fixes it:

% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorChannels] = size(boxImage);
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Convert it to gray scale by taking only the green channel.
  boxImage= boxImage(:, :, 2); % Take green channel.
end

[chaala chibani]

thanks but there are other error can you help me: Error in extractFeatures (line 162) [blockSize, SURFSize, descriptor,upright] ...

Error in cherche (line 20) [boxFeatures, boxPoints] = extractFeatures(boxImage, boxPoints);

[Image Analyst]

Sorry, I don't have the Computer Vision System Toolbox.

[Ced]

hm... it looks like your input is correct. But what kind of image are you reading? These are the accepted input classes for

extractFeatures(I, points)

as you are calling it:

%   Class Support
%   -------------
%   The input image I can be logical, uint8, uint16, int16, single, or
%   double, and it must be real and nonsparse. POINTS can be a SURFPoints,
%   MSERRegions, cornerPoints, or BRISKPoints object, or int16, uint16,
%   int32, uint32, single or double.

Also, which points are you using? The output of detectSURFFeatures as you are using it above should be fine, but maybe you changed something?

Answer 2

[Dima Lisin]

I am guessing that your image is M-by-N-by-3 (RGB). detectSURFFeatures only takes M-by-N grayscale images. Convert your images to grayscale using rgb2gray.

Answer 3

[Mystery Devil]

Can you please explain it to me what does this two lines mean?

matchedBoxPoints = boxPoints(boxPairs(:, 1), :);
matchedScenePoints = scenePoints(boxPairs(:, 2), :);

Thank you very much. It's kind of urgent.