dicom_has_overlay_bits.m
4b5355e68791Bashardoust_SystCoord

dicom_has_overlay_bits.m
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			function overlay_bits = dicom_has_overlay_bits(info)
			%DICOM_HAS_OVERLAY_BITS Return overlay bit positions in pixel cells.

			% Copyright 1993-2005 The MathWorks, Inc.

			% Overlay data requires one or more OverlayBitsAllocated attributes to be
			% set (60xx,0100).

			info_fields = fieldnames(info);
			overlay_fields = strmatch('OverlayBitsAllocated', info_fields);

			% Determine if overlay data is with the pixel data.
			if (~isempty(overlay_fields))

			% Overlay pixels are with Image pixels iff OverlayBitsAllocated and
			% BitsAllocated are the same.

			overlay_bits = [];
			count = 0;

			% Find overlay bit location for each overlay in pixel cell.
			for p = overlay_fields'

			OverlayBitsAllocated = info.(info_fields{p});

			if (isequal(OverlayBitsAllocated, info.BitsAllocated))

			% Find position in pixel cell: OverlayBitPosition (60xx,0102).

			count = count + 1;

			OBP_field = strrep(info_fields{p}, 'BitsAllocated', ...
			'BitPosition');

			overlay_bits(count) = info.(OBP_field);

			end

			end

			else

			% No overlays.
			overlay_bits = [];

			end