MATLAB: Simultaneously horizontal and vertical subsampling in CMOS camera

subsampling cmos camera

I have a CMOS camera with image matrix size 1216*1936. This code reduces the size:

cam.Size.Subsampling.Set(uc480.Defines.SubsamplingMode.Vertical2X)

But I want to reduce the size both in vertical and horizontal directions. Apparently I should use logical OR but with this code dosen't do that and still works for one dimension:

cam.Size.Subsampling.Set(uc480.Defines.SubsamplingMode.Vertical2X)|cam.Size.Subsampling.Set(uc480.Defines.SubsamplingMode.Horizontal2X)

Would you please help me with that

Thanks

Best Answer

cam.Size.Subsampling.Set( bitor(uc480.Defines.SubsamplingMode.Vertical2X, uc480.Defines.SubsamplingMode.Horizontal2X) )

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MATLAB: IDS uEye camera control in .NET framework.

cam.Size.Subsampling.Set( bitor(uc480.Defines.SubsamplingMode.Vertical2X, uc480.Defines.SubsamplingMode.Horizontal2X) )

MATLAB: Controlling uEye µEye camera in Matlab with shared library by loadlibrary

The issue is not quite to do with handling pointers - Matlab does that quite well when connecting to DLLs - you have to pass a dummy variable in place of the pointer and then matlab appends the result to the return parameters:

e.g.

int GrabImage(uint8 *data);

becomes

[ret, data] = GrabImage(zeros(SizeVectorOfImage));

where the original function returns a success/failure error code. I believe the dummy variable needs to have allocated sufficient memory to hold the data, but I cannot remember exactly - its been a long time since I used this approach.

The actual problem comes from linking with the other libraries and using non-native data types. In general, I found one has to write a wrapper dll, or a mex file to interface between Matlab and the uEye DLL. You can then use this to allocated memory and help speed things up. However, this gets cumbersome as you have to implement each function manually.

Alternatively you can access the .NET assembly directly, although you have to work around the fact that Matlab does not use pointers. Here is an example:

Remember to "EXIT" your camera before trying to re-initialise the same camera

%   Add NET assembly if it does not exist
%   May need to change specific location of library
asm = System.AppDomain.CurrentDomain.GetAssemblies;
if ~any(arrayfun(@(n) strncmpi(char(asm.Get(n-1).FullName), ...
        'uEyeDotNet', length('uEyeDotNet')), 1:asm.Length))
    NET.addAssembly(...
        'C:\Program Files\IDS\uEye\Develop\DotNet\signed\uEyeDotNet.dll');
end
%   Create camera object handle
cam = uEye.Camera;
%   Open 1st available camera
%   Returns if unsuccessful
if ~strcmp(char(cam.Init), 'SUCCESS')
    error('Could not initialize camera');
end
%   Set display mode to bitmap (DiB)
if ~strcmp(char(cam.Display.Mode.Set(uEye.Defines.DisplayMode.DiB)), ...
        'SUCCESS')
    error('Could not set display mode');
end
%   Set colormode to 8-bit RAW
if ~strcmp(char(cam.PixelFormat.Set(uEye.Defines.ColorMode.SensorRaw8)), ...
        'SUCCESS')
    error('Could not set pixel format');
end
%   Set trigger mode to software (single image acquisition)
if ~strcmp(char(cam.Trigger.Set(uEye.Defines.TriggerMode.Software)), 'SUCCESS')
    error('Could not set trigger format');
end
%   Allocate image memory
[ErrChk, img.ID] = cam.Memory.Allocate(true);
if ~strcmp(char(ErrChk), 'SUCCESS')
    error('Could not allocate memory');
end
%   Obtain image information
[ErrChk, img.Width, img.Height, img.Bits, img.Pitch] ...
    = cam.Memory.Inquire(img.ID);
if ~strcmp(char(ErrChk), 'SUCCESS')
    error('Could not get image information');
end
%   Acquire image

if ~strcmp(char(cam.Acquisition.Freeze(true)), 'SUCCESS')
    error('Could not acquire image');
end
%   Extract image

[ErrChk, tmp] = cam.Memory.CopyToArray(img.ID); 
if ~strcmp(char(ErrChk), 'SUCCESS')
    error('Could not obtain image data');
end
%   Reshape image

img.Data = reshape(uint8(tmp), [img.Width, img.Height, img.Bits/8]);
%   Draw image

himg = imshow(img.Data, 'Border', 'tight');
%   Acquire & draw 100 times
for n=1:100
    %   Acquire image
    if ~strcmp(char(cam.Acquisition.Freeze(true)), 'SUCCESS')
        error('Could not acquire image');
    end
      %   Extract image
      [ErrChk, tmp] = cam.Memory.CopyToArray(img.ID); 
      if ~strcmp(char(ErrChk), 'SUCCESS')
          error('Could not obtain image data');
      end
      %   Reshape image
      img.Data = reshape(uint8(tmp), [img.Width, img.Height, img.Bits/8]);
      %   Draw image
      set(himg, 'CData', img.Data);
      drawnow;
  end
%   Close camera
if ~strcmp(char(cam.Exit), 'SUCCESS')
    error('Could not close camera');
end

Best Answer

Related Solutions

MATLAB: IDS uEye camera control in .NET framework.

MATLAB: Controlling uEye µEye camera in Matlab with shared library by loadlibrary

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