[PyOpenCL] Ghosting with bilinear Interpolation of OpenCV-Images

[Giancarlo Colasante]

Hello,

maybe there are a mistake in Tharang's code,
i test with an example (chapter 20) from:
http://code.google.com/p/opencl-book-samples/
and it's working.

i have "encapsulated" the way to create a context and a
OpenCL program oriented to image processing in one function
   def ContextProgram(fileName):
where "fileName" is a file with an OpenCL program

the result is:
http://tinypic.com/r/derx8k/5
http://i43.tinypic.com/derx8k.jpg

Regards.
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def ContextProgram(fileName):
# Create an OpenCL context on first available platform
    platforms = cl.get_platforms();
    if len(platforms) == 0:
        print 'Failed to find any OpenCL platforms.'
        return None
    # Next, create an OpenCL context on the first platform.
    #  Attempt to create a GPU-based context, and if that fails,
    #  try to create a CPU-based context.
    devices = platforms[0].get_devices(cl.device_type.GPU)
    if len(devices) == 0:
        print 'Could not find GPU device, trying CPU...'
        devices = platforms[0].get_devices(cl.device_type.CPU)
        if len(devices) == 0:
            print 'Could not find OpenCL GPU or CPU device.'
            return None
    device = devices[0] # first device
    # Make sure the device supports images, otherwise exit
    if not device.get_info(cl.device_info.IMAGE_SUPPORT):
        print 'OpenCL device does not support images.'
        return None
    # Create a context on the first device
    context = cl.Context([device])
# Create a command-queue on the first device available
    Queue = cl.CommandQueue(context, device)
#  Create an OpenCL program from the kernel source file
    kernelFile = open(fileName, 'r')
    kernelStr = kernelFile.read()
    # Load the program source
    program = cl.Program(context, kernelStr)
    # Build the program and check for errors
    program.build(devices=[device])
    return context, Queue, program
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