Difficulty with imwarp function

I am writing a code in order to generate a 3d view of a painting from a single image of the painting. For that, i have to generate the 3d views of all the planes present in the image using projective homography transformations. I am using imwarp in order to warp the image. But after warping the output image size is [295,524569] while the input image is only[892,1152]. Can anybody please tell me where am i going wrong?

[Silja Heilmann]

I can not provide an answer but I think I may have a related problem. While using imwarp on an 777x3161 image I get the following error:

Error using ippgeotrans
Requested 50995x174010 (33.1GB) array exceeds maximum array size preference. Creation of arrays greater than this limit may take a long time and
cause MATLAB to become unresponsive. See array size limit or preference panel for more information.
Error in imwarp>ippWarpAffine (line 566)
    outputImage = ippgeotrans(single(inputImage),double(T),Rout.ImageSize,interp,single(fillVal));
Error in imwarp>remapPointsAndResample (line 223)
        outputImage = ippWarpAffine(inputImage,R_A,tform,outputRef,method,fillValues);
Error in imwarp (line 210)
outputImage = remapPointsAndResample(parsedInputs.InputImage,R_A,tform,outputRef,method,fillValues);

I use imwarp inside a loop and the error only occurs for one particular image. For the other images imwarp returns an image with the expected size (777x3161)

There is no documentation on ippgeotrans so I have no idea why it is requesting an array of this astronomical size...

[Walter Roberson]

I responded in the Question you posted about this.

Answer 1

[Walter Roberson]

You probably used something like

[numrows, numcols] = size(YourImage)

when YourImage was an RGB image. RGB images are 3 dimensional, and when you use size() with only two outputs for a 3D matrix, the second output is set to the product of the number of columns and the length of the third dimension. For example,

[numrows, numcols] = size(zeros(25, 31, 3))

would return numrows of 25 and numcols of 31*3

When you take size() of a 3D matrix, either only use one output or else use at least 3 outputs.