DCMTK: DcmRLECodecEncoder Class Reference

DCMTK Version 3.6.9 OFFIS DICOM Toolkit

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DcmRLECodecEncoder Class Reference

encoder class for RLE. More...

Inheritance diagram for DcmRLECodecEncoder:

## Public Member Functions
| DcmRLECodecEncoder ()
| default constructor
virtual | ~DcmRLECodecEncoder ()
| destructor
virtual OFCondition | decode (const DcmRepresentationParameter *fromRepParam, DcmPixelSequence *pixSeq, DcmPolymorphOBOW &uncompressedPixelData, const DcmCodecParameter *cp, const DcmStack &objStack, OFBool &removeOldRep) const
| decompresses the given pixel sequence and stores the result in the given uncompressedPixelData element.
virtual OFCondition | decodeFrame (const DcmRepresentationParameter *fromParam, DcmPixelSequence *fromPixSeq, const DcmCodecParameter *cp, DcmItem *dataset, Uint32 frameNo, Uint32 &startFragment, void *buffer, Uint32 bufSize, OFString &decompressedColorModel) const
| decompresses a single frame from the given pixel sequence and stores the result in the given buffer.
virtual OFCondition | encode (const Uint16 *pixelData, const Uint32 length, const DcmRepresentationParameter *toRepParam, DcmPixelSequence *&pixSeq, const DcmCodecParameter *cp, DcmStack &objStack, OFBool &removeOldRep) const
| compresses the given uncompressed DICOM image and stores the result in the given pixSeq element.
virtual OFCondition | encode (const E_TransferSyntax fromRepType, const DcmRepresentationParameter *fromRepParam, DcmPixelSequence *fromPixSeq, const DcmRepresentationParameter *toRepParam, DcmPixelSequence *&toPixSeq, const DcmCodecParameter *cp, DcmStack &objStack, OFBool &removeOldRep) const
| transcodes (re-compresses) the given compressed DICOM image and stores the result in the given toPixSeq element.
virtual OFBool | canChangeCoding (const E_TransferSyntax oldRepType, const E_TransferSyntax newRepType) const
| checks if this codec is able to convert from the given current transfer syntax to the given new transfer syntax
virtual OFCondition | determineDecompressedColorModel (const DcmRepresentationParameter *fromParam, DcmPixelSequence *fromPixSeq, const DcmCodecParameter *cp, DcmItem *dataset, OFString &decompressedColorModel) const
| determine color model of the decompressed image
Public Member Functions inherited from DcmCodec
| DcmCodec ()
| default constructor
virtual | ~DcmCodec ()
| destructor

## Private Member Functions
| DcmRLECodecEncoder (const DcmRLECodecEncoder &)
| private undefined copy constructor
DcmRLECodecEncoder & | operator= (const DcmRLECodecEncoder &)
| private undefined copy assignment operator

## Static Private Member Functions
static OFCondition | updateDerivationDescription (DcmItem *dataset, double ratio)
| create Derivation Description.

## Additional Inherited Members
Static Public Member Functions inherited from DcmCodec
static OFCondition | insertStringIfMissing (DcmItem *dataset, const DcmTagKey &tag, const char *val)
| helper function that inserts a string attribute with a given value into a dataset if missing in the dataset.
static OFCondition | convertToSecondaryCapture (DcmItem *dataset)
| helper function that converts a dataset containing a DICOM image into a valid (standard extended) Secondary Capture object by inserting all attributes that are type 1/2 in Secondary Capture and missing in the source dataset.
static OFCondition | newInstance (DcmItem *dataset, const char *purposeOfReferenceCodingScheme=NULL, const char *purposeOfReferenceCodeValue=NULL, const char *purposeOfReferenceCodeMeaning=NULL)
| create new SOP Instance UID and Source Image Sequence referencing the old SOP instance (if present)
static OFCondition | updateImageType (DcmItem *dataset)
| update value of the Image Type element (if needed).
static OFCondition | insertCodeSequence (DcmItem *dataset, const DcmTagKey &tagKey, const char *codingSchemeDesignator, const char *codeValue, const char *codeMeaning)
| insert code sequence into the given dataset
static OFCondition | determineStartFragment (Uint32 frameNo, Sint32 numberOfFrames, DcmPixelSequence *fromPixSeq, Uint32 &currentItem)
| determine the index number (starting with zero) of the compressed pixel data fragment corresponding to the given frame (also starting with zero)

## Detailed Description

encoder class for RLE.

This class only supports compression, it neither implements decoding nor transcoding.

## Member Function Documentation

## ◆ canChangeCoding()

virtual OFBool DcmRLECodecEncoder::canChangeCoding | ( | const E_TransferSyntax | oldRepType,
|  | const E_TransferSyntax | newRepType ) const
| virtual

checks if this codec is able to convert from the given current transfer syntax to the given new transfer syntax

Parameters

  oldRepType | current transfer syntax
  newRepType | desired new transfer syntax

Returns
  true if transformation is supported by this codec, false otherwise.

Implements DcmCodec.

## ◆ decode()

virtual OFCondition DcmRLECodecEncoder::decode | ( | const DcmRepresentationParameter * | fromRepParam,
|  | DcmPixelSequence * | pixSeq,
|  | DcmPolymorphOBOW & | uncompressedPixelData,
|  | const DcmCodecParameter * | cp,
|  | const DcmStack & | objStack,
|  | OFBool & | removeOldRep ) const
| virtual

decompresses the given pixel sequence and stores the result in the given uncompressedPixelData element.

Parameters

  fromRepParam | current representation parameter of compressed data, may be NULL
  pixSeq | compressed pixel sequence
  uncompressedPixelData | uncompressed pixel data stored in this element
  cp | codec parameters for this codec
  objStack | stack pointing to the location of the pixel data element in the current dataset.
  removeOldRep | boolean flag that should be set to false before this method call and will be set to true if the codec modifies the DICOM dataset such that the pixel data of the original representation may not be usable anymore.

Returns
  EC_Normal if successful, an error code otherwise.

Implements DcmCodec.

## ◆ decodeFrame()

virtual OFCondition DcmRLECodecEncoder::decodeFrame | ( | const DcmRepresentationParameter * | fromParam,
|  | DcmPixelSequence * | fromPixSeq,
|  | const DcmCodecParameter * | cp,
|  | DcmItem * | dataset,
|  | Uint32 | frameNo,
|  | Uint32 & | startFragment,
|  | void * | buffer,
|  | Uint32 | bufSize,
|  | OFString & | decompressedColorModel ) const
| virtual

decompresses a single frame from the given pixel sequence and stores the result in the given buffer.

Parameters

  fromParam | representation parameter of current compressed representation, may be NULL.
  fromPixSeq | compressed pixel sequence
  cp | codec parameters for this codec
  dataset | pointer to dataset in which pixel data element is contained
  frameNo | number of frame, starting with 0 for the first frame
  startFragment | index of the compressed fragment that contains all or the first part of the compressed bitstream for the given frameNo. Upon successful return this parameter is updated to contain the index of the first compressed fragment of the next frame. When unknown, zero should be passed. In this case the decompression algorithm will try to determine the index by itself, which will always work if frames are decompressed in increasing order from first to last, but may fail if frames are decompressed in random order, multiple fragments per frame and multiple frames are present in the dataset, and the offset table is empty.
  buffer | pointer to buffer where frame is to be stored
  bufSize | size of buffer in bytes
  decompressedColorModel | upon successful return, the color model of the decompressed image (which may be different from the one used in the compressed images) is returned in this parameter.

Returns
  EC_Normal if successful, an error code otherwise.

Implements DcmCodec.

## ◆ determineDecompressedColorModel()

virtual OFCondition DcmRLECodecEncoder::determineDecompressedColorModel | ( | const DcmRepresentationParameter * | fromParam,
|  | DcmPixelSequence * | fromPixSeq,
|  | const DcmCodecParameter * | cp,
|  | DcmItem * | dataset,
|  | OFString & | decompressedColorModel ) const
| virtual

determine color model of the decompressed image

Parameters

  fromParam | representation parameter of current compressed representation, may be NULL
  fromPixSeq | compressed pixel sequence
  cp | codec parameters for this codec
  dataset | pointer to dataset in which pixel data element is contained
  dataset | pointer to DICOM dataset in which this pixel data object is located. Used to access photometric interpretation.
  decompressedColorModel | upon successful return, the color model of the decompressed image (which may be different from the one used in the compressed images) is returned in this parameter

Returns
  EC_Normal if successful, an error code otherwise

Implements DcmCodec.

## ◆ encode() [1/2]

virtual OFCondition DcmRLECodecEncoder::encode | ( | const E_TransferSyntax | fromRepType,
|  | const DcmRepresentationParameter * | fromRepParam,
|  | DcmPixelSequence * | fromPixSeq,
|  | const DcmRepresentationParameter * | toRepParam,
|  | DcmPixelSequence *& | toPixSeq,
|  | const DcmCodecParameter * | cp,
|  | DcmStack & | objStack,
|  | OFBool & | removeOldRep ) const
| virtual

transcodes (re-compresses) the given compressed DICOM image and stores the result in the given toPixSeq element.

Parameters

  fromRepType | current transfer syntax of the compressed image
  fromRepParam | current representation parameter of compressed data, may be NULL
  fromPixSeq | compressed pixel sequence
  toRepParam | representation parameter describing the desired new compressed representation (e.g. JPEG quality)
  toPixSeq | compressed pixel sequence (pointer to new DcmPixelSequence object allocated on heap) returned in this parameter upon success.
  cp | codec parameters for this codec
  objStack | stack pointing to the location of the pixel data element in the current dataset.
  removeOldRep | boolean flag that should be set to false before this method call and will be set to true if the codec modifies the DICOM dataset such that the pixel data of the original representation may not be usable anymore.

Returns
  EC_Normal if successful, an error code otherwise.

Implements DcmCodec.

## ◆ encode() [2/2]

virtual OFCondition DcmRLECodecEncoder::encode | ( | const Uint16 * | pixelData,
|  | const Uint32 | length,
|  | const DcmRepresentationParameter * | toRepParam,
|  | DcmPixelSequence *& | pixSeq,
|  | const DcmCodecParameter * | cp,
|  | DcmStack & | objStack,
|  | OFBool & | removeOldRep ) const
| virtual

compresses the given uncompressed DICOM image and stores the result in the given pixSeq element.

Parameters

  pixelData | pointer to the uncompressed image data in OW format and local byte order
  length | of the pixel data field in bytes
  toRepParam | representation parameter describing the desired compressed representation (e.g. JPEG quality)
  pixSeq | compressed pixel sequence (pointer to new DcmPixelSequence object allocated on heap) returned in this parameter upon success.
  cp | codec parameters for this codec
  objStack | stack pointing to the location of the pixel data element in the current dataset.
  removeOldRep | boolean flag that should be set to false before this method call and will be set to true if the codec modifies the DICOM dataset such that the pixel data of the original representation may not be usable anymore.

Returns
  EC_Normal if successful, an error code otherwise.

Implements DcmCodec.

## ◆ updateDerivationDescription()

static OFCondition DcmRLECodecEncoder::updateDerivationDescription | ( | DcmItem * | dataset,
|  | double | ratio )
| staticprivate

create Derivation Description.

Parameters

  dataset | dataset to be modified
  ratio | image compression ratio. This is the real effective ratio between compressed and uncompressed image, i. e. 2.5 means a 2.5:1 compression.

Returns
  EC_Normal if successful, an error code otherwise

The documentation for this class was generated from the following file:

- dcmdata/include/dcmtk/dcmdata/dcrlecce.h

Generated on Sat Mar 1 2025 for DCMTK Version 3.6.9 by Doxygen 1.13.2