I am getting the error - Undefined function 'showPointCloud' for input arguments of type 'uint8' . How can this error be removed?

vid = videoinput('pointgrey', 1, 'F7_RGB_1280x960_Mode3');

frame=getsnapshot(vid);

leftim=frame(:,:,3);

centerim=frame(:,:,2);

rightim=frame(:,:,1);

leftim=imresize(leftim,0.5);

rightim=imresize(rightim,0.5);

centerim=imresize(centerim,0.5);

[J1, J2] = rectifyStereoImages(leftim,centerim,nParamsSmall);

dispMap2 = disparity(J1,J2,'Method', 'BlockMatching', 'DisparityRange', [0 128]);

   marker_idx = (dispMap2 == -realmax('single'));

        dispMap2(marker_idx) = min(dispMap2(~marker_idx));

       %figure; imshow(mat2gray(dispMap2));

   imshow(dispMap2, [0, 64]);

colormap('jet');

point3D = reconstructScene(dispMap2, nParamsSmall);

% Convert from millimeters to meters.

point3D = point3D / 1000;

% Plot points between 3 and 7 meters away from the camera.

z = point3D(:, :, 3);

maxZ = 7;

minZ = 3;

zdisp = z;

zdisp(z < minZ | z > maxZ) = NaN;

point3Ddisp = point3D;

point3Ddisp(:,:,3) = zdisp;

showPointCloud(point3Ddisp, J1, 'VerticalAxis', 'Y',...
'VerticalAxisDir', 'Down' );

xlabel('X');

ylabel('Y');

zlabel('Z');

Answer 1

[Walter Roberson]

That is puzzling. To have that happen, point3Ddisp would have to be uint8, which would mean that point3D would have to be uint8 which would mean that reconstructscene() would have had to return uint8 which disagrees with the documentation which indicates that reconstructscene must return single or double.

Are you certain the code is what you show here?

In any case, showpointcloud was added in R2014b; which version of the Computer Vision toolbox are you using?

[Bhupendra Ninania]

I am using Matlab R2014a. Will this code won't work in this matlab version?

[Walter Roberson]

http://www.mathworks.com/help/vision/ref/showpointcloud.html

look at the bottom of the page:

"Introduced in R2014b"

so No, it will not work in R2014a.

[Bhupendra Ninania]

Thanks man :)

Answer 2

[Dima Lisin]

You should be able to use scatter3 instead of showPointCloud.