DICOM PS3.5 2025a - Data Structures and Encoding
8.2.16 Deflated Image Frame Compression (Current)
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PS3.5 > Encoding of Pixel, Overlay and Waveform Data > Native or Encapsulated Format Encoding > Deflated Image Frame Compression

8.2.16 Deflated Image Frame Compression

DICOM provides a mechanism for supporting the use of Deflate compression of each individual image frame separately using the Encapsulated Format. Deflate is a byte oriented lossless compression scheme used with the Encapsulated Format.

Section A.4.13 defines a Transfer Syntax that uses the Deflate algorithm defined in [RFC1951] to compress the pixel data of each image frame as a separate compressed bit stream.

Note

  1. Deflated Image Frame Compression is only applicable to pixel data conveyed in the Pixel Data (7FE0,0010) Data Element.

  2. Though it uses the same compression scheme, the Deflated Image Frame Compression Transfer Syntax is distinct from the DICOM Deflated Explicit VR Little Endian Transfer Syntax defined in Section A.5, which compresses the entire Data Set as a single compressed bit stream.

Since the Deflate algorithm compresses byte streams regardless of their content, there are no restrictions on the values of Pixel Data Related Attributes.

Note

One application of Deflated Image Frame Compression is the lossless compression of single bit (bilevel, Bits Allocated (0028,0100) == 1) Segmentation images, but the mechanism is generic and not limited to any particular characteristics of the Pixel Data arrangement or values.

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8.2.15 JPEG XL Image Compression  Home  8.3 Waveform Data and Related Data Elements
DICOM PS3.5 2025a - Data Structures and Encoding