Overlays encoded in pixel data and supplement 106 (JPIP) - DICOM

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Thread: Overlays encoded in pixel data and supplement 106 (JPIP)

  1. Overlays encoded in pixel data and supplement 106 (JPIP)

    Hi,

    Can overlays still be encoded in the pixel data when the JPEG-2000/JPIP
    transfer syntax is used?

    regards,

    Thomas

  2. Re: Overlays encoded in pixel data and supplement 106 (JPIP)

    Hi Thomas

    Embedded overlays (in the "unused" high bits) are not supported
    by any of the image compression transfer syntaxes, like JPEG
    or JPEG 2000, so these aren't supported for JPIP either, since
    it is just a means of transferring JPEG 2000 data ... the number
    of bits passed through the compression/decompression cycle is
    intended to defined by Bits Stored (only), which excludes the
    overlay bits. This is not terribly clearly expressed in the
    standard though.

    The use of (60xx,3000) Overlay Data to separately encode overlay
    bits is independent of the transfer syntax and would work with
    the JPIP transfer syntax, since the overlays data would be sent
    with the "header" in the normal way, not retrieved as JPIP
    coefficients.

    David

    PS. The use of embedded overlay bits has been retired as of
    Sup 98, so folks should go out of their way to avoid using
    them, and if presented with them in an instance that they
    are going to transcode (e.g., compress), should probably
    move the overlay to (60xx,3000) or into a presentation
    state.

    Thomas Sondergaard wrote:
    > Hi,
    >
    > Can overlays still be encoded in the pixel data when the JPEG-2000/JPIP
    > transfer syntax is used?
    >
    > regards,
    >
    > Thomas


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