Problems while rotating/flipping an image on CPU and GPU

[vguptai]

Hi,

Can anyone share an example for rotation of an image on CPU and GPU?

When I try the CPU version, it seems to indicate that rotate function is not available.

local cv_im = cv.imread{'demo/data/lena.jpg',  cv.IMREAD_COLOR}
local im_rotated = cv.rotate{src=cv_im, dsize={512,512}, angle=1.5708}

attempt to call field 'rotate' (a nil value)

And when I rotate on GPU, I do not seem to get the correct result.

local cv_im = cv.imread{'demo/data/lena.jpg',  cv.IMREAD_COLOR}

local im_cuda = cv_im:cuda()

local im_rotated_gpu = cv.cuda.rotate{src=im_cuda, dsize={512,512}, angle=1.5708}

cv.imwrite{'demo/data/lena_rotated_gpu.jpg', im_rotated_gpu:byte()}

The image written is all black !!

Similar error while flipping an image on GPU:

cv.cuda.flip{src=im_cuda, flipCode = 0}

attempt to call field 'flip' (a nil value)

[shrubb]

Hi,

on CPU refer to OpenCV documentation and use cv.warpAffine. cv.cuda.flip isn't implemented unfortunately. And there are still many bugs in CUDA wrappers that I didn't have time to fix.

Overall, I strongly recommend using Python because Torch is basically dead and this library is very weakly maintained.