LDicomDS::GetOverlayAttributes

#include "ltdic.h"

L_UINT16 LDicomDS::GetOverlayAttributes(uOverlayIndex, pOverlayAttributes,uStructSize, pGroupNumber, pIsOverlayInDataset, uFlags)

Retrieves the attributes of the overlay at the specified index.

Returns

Comments

This function will retrieve the attributes of an overlay and store their values in the structure pointed to by pOverlayAttributes.

pOverlayAttributes->uStructSize will be set to the value of the parameter uStructSize.

Most of the members of the structure pOverlayAttributes are based on the "Overlay Plane Module Attributes" in the DICOM standard.

If the overlay data is embedded in the "Image Pixel Data" (7FE0,0010), the flag OVERLAY_USEBITPLANE will be set inside pOverlayAttributes-> uFlags. If this flag is not set then the overlay data is stored in the "Overlay Data" (60xx,3000) element and in this case you can call LDicomDS::GetOverlayBitmap to get the data for that overlay.

pOverlayAttributes-> ptOrigin will hold the value of the "Overlay Origin" (60xx,0050) element, however the upper left pixel of the image will have the coordinate 0\0, instead of 1\1( as in the DICOM standard).

This function will always set pOverlayAttributes->crColor to black.

For multi-frame overlays, this function will update pOverlayAttributes->nNumFramesInOverlay with the value of "Number of Frames in Overlay" (60xx,0015) element and pOverlayAttributes-> uImageFrameOrigin with the value of "Image Frame Origin" (60xx,0051) element.

pOverlayAttributes-> szActivationLayer will be updated with the value of the element "Overlay Activation Layer" (60xx,1001)

Because DICOM uses "Repeating Groups" to represent multiple overlays, pGroupNumber is useful in knowing under which group number this overlay exists.

Required DLLs and Libraries

Platforms

Win32, x64