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. More...

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. More...

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. More...

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. More...

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 More...

virtual OFCondition	determineDecompressedColorModel (const DcmRepresentationParameter fromParam, DcmPixelSequence fromPixSeq, const DcmCodecParameter cp, DcmItem dataset, OFString &decompressedColorModel) const
	determine color model of the decompressed image More...

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. More...

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. More...

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. More...

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) More...

static OFCondition	updateImageType (DcmItem *dataset)
	set first value of Image Type to DERIVED. More...

static OFCondition	insertCodeSequence (DcmItem dataset, const DcmTagKey &tagKey, const char codingSchemeDesignator, const char codeValue, const char codeMeaning)
	insert code sequence into the given dataset More...

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) More...

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

Public Member Functions

Private Member Functions

Static Private Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ canChangeCoding()

◆ decode()

◆ decodeFrame()

◆ determineDecompressedColorModel()

◆ encode() [1/2]

◆ encode() [2/2]

◆ updateDerivationDescription()