error to display image

This error message ' MAP must be a m x 3 array ' when i want to process it to gray. I got the image by capture from webcam and want to display it to axes. Can someone tell me, what should i do to fix it ?

thank you

Answer 1

[Image Analyst]

You're passing it a colormap that is not correct. Try something like this:

snappedImage = getsnapshot(vidobj);
snappedImage = rgb2gray(snappedImage); % Convert from RGB to grayscale.
imshow(snappedImage);
colormap(gray(256));
colorbar;

[Lidank Abiel]

it still didn't work sir. error message appear again. i make 2 button function, first to capture image :

 global vid capture
 capture = getsnapshot(vid);
 axes(handles.axes3);
 axis off
 imshow(capture);

second, button function to process it to gray :

 global capture
 global citra

 if capture == 1
        I = rgb2gray(capture);
 else
    I = rgb2gray(citra);
 end
 colormap(gray(256));
 colorbar;
        BW = tampung;
        BW = im2bw(BW);
 .....

Answer 2

[Nitin]

If you are reading direclty from a video, you should probably use the step function:

For example:

filename = 'shaky_car.avi';
hVideoSrc = vision.VideoFileReader(filename, 'ImageColorSpace', 'Intensity');

imgA = step(hVideoSrc); % Read first frame into imgA

otherwise you might extract all the frames to a folder and load them using imread

You may find this link useful: http://www.mathworks.com.au/help/vision/examples/video-stabilization-using-point-feature-matching.html

[Lidank Abiel]

No, i'm not take to a video.

[Lidank Abiel]

sometimes, the error message like this :

 ??? Error using ==> regionprops>ParseInputs at 1112
Size of I doesn't match size information found in the
first input argument.

 Error in ==> regionprops at 154
 [I,requestedStats,officialStats] = ParseInputs(imageSize,
 varargin{:});

 Error in ==> tes>FinalProcess_Callback at 182
        s = regionprops(BW, I,
        {'Centroid','WeightedCentroid'}); %untuk
        penghitungan properti objek menggunakan nilai
        pixel dari gambar gray

 Error in ==> gui_mainfcn at 96
        feval(varargin{:});

 Error in ==> tes at 17
    gui_mainfcn(gui_State, varargin{:});

 Error in ==>
 @(hObject,eventdata)tes('FinalProcess_Callback',hObject,eventdata,guidata  (hObject))

 ??? Error while evaluating uicontrol Callback