org.apache.commons.imaging.common.itu_t4

Class T4AndT6Compression

java.lang.Object

org.apache.commons.imaging.common.itu_t4.T4AndT6Compression

public final class T4AndT6Compression
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLACK
static int	WHITE

Method Summary

Modifier and Type	Method and Description
static byte[]	compressModifiedHuffman(byte[] uncompressed, int width, int height) Compressed with the "Modified Huffman" encoding of section 10 in the TIFF6 specification.
static byte[]	compressT4_1D(byte[] uncompressed, int width, int height, boolean hasFill)
static byte[]	compressT4_2D(byte[] uncompressed, int width, int height, boolean hasFill, int parameterK)
static byte[]	compressT6(byte[] uncompressed, int width, int height)
static byte[]	decompressModifiedHuffman(byte[] compressed, int width, int height) Decompresses the "Modified Huffman" encoding of section 10 in the TIFF6 specification.
static byte[]	decompressT4_1D(byte[] compressed, int width, int height, boolean hasFill) Decompresses T.4 1D encoded data.
static byte[]	decompressT4_2D(byte[] compressed, int width, int height, boolean hasFill) Decompressed T.4 2D encoded data.
static byte[]	decompressT6(byte[] compressed, int width, int height) Decompress T.6 encoded data.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

WHITE

public static final int WHITE

See Also:

Constant Field Values

BLACK

public static final int BLACK

See Also:

Constant Field Values

Method Detail

compressModifiedHuffman

public static byte[] compressModifiedHuffman(byte[] uncompressed,
                                             int width,
                                             int height)
                                      throws ImageWriteException

Compressed with the "Modified Huffman" encoding of section 10 in the TIFF6 specification. No EOLs, no RTC, rows are padded to end on a byte boundary.

Parameters:

uncompressed -

width -

height -

Returns:

the compressed data

Throws:

ImageWriteException

decompressModifiedHuffman

public static byte[] decompressModifiedHuffman(byte[] compressed,
                                               int width,
                                               int height)
                                        throws ImageReadException

Decompresses the "Modified Huffman" encoding of section 10 in the TIFF6 specification. No EOLs, no RTC, rows are padded to end on a byte boundary.

Parameters:

compressed -

width -

height -

Returns:

the decompressed data

Throws:

ImageReadException

compressT4_1D

public static byte[] compressT4_1D(byte[] uncompressed,
                                   int width,
                                   int height,
                                   boolean hasFill)
                            throws ImageWriteException

Throws:

ImageWriteException

decompressT4_1D

public static byte[] decompressT4_1D(byte[] compressed,
                                     int width,
                                     int height,
                                     boolean hasFill)
                              throws ImageReadException

Decompresses T.4 1D encoded data. EOL at the beginning and after each row, can be preceded by fill bits to fit on a byte boundary, no RTC.

Parameters:

compressed -

width -

height -

Returns:

the decompressed data

Throws:

ImageReadException

compressT4_2D

public static byte[] compressT4_2D(byte[] uncompressed,
                                   int width,
                                   int height,
                                   boolean hasFill,
                                   int parameterK)
                            throws ImageWriteException

Throws:

ImageWriteException

decompressT4_2D

public static byte[] decompressT4_2D(byte[] compressed,
                                     int width,
                                     int height,
                                     boolean hasFill)
                              throws ImageReadException

Decompressed T.4 2D encoded data. EOL at the beginning and after each row, can be preceded by fill bits to fit on a byte boundary, and is succeeded by a tag bit determining whether the next line is encoded using 1D or 2D. No RTC.

Parameters:

compressed -

width -

height -

Returns:

the decompressed data

Throws:

ImageReadException

compressT6

public static byte[] compressT6(byte[] uncompressed,
                                int width,
                                int height)
                         throws ImageWriteException

Throws:

ImageWriteException

decompressT6

public static byte[] decompressT6(byte[] compressed,
                                  int width,
                                  int height)
                           throws ImageReadException

Decompress T.6 encoded data. No EOLs, except for 2 consecutive ones at the end (the EOFB, end of fax block). No RTC. No fill bits anywhere. All data is 2D encoded.

Parameters:

compressed -

width -

height -

Returns:

the decompressed data

Throws:

ImageReadException