enc_jpeg2000.c File Reference

Encodes JPEG2000 code stream. More...

#include <stdio.h>
#include <stdlib.h>
#include "grib2.h"
#include "jasper/jasper.h"

Go to the source code of this file.

Macros
#define	JAS_1_700_2
	Define for JAS. More...
#define	MAXOPTSSIZE   1024
	Maximum size of options. More...

Functions
int	enc_jpeg2000 (unsigned char *cin, g2int width, g2int height, g2int nbits, g2int ltype, g2int ratio, g2int retry, char *outjpc, g2int jpclen)
	This Function encodes a grayscale image into a JPEG2000 code stream specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using JasPer Software version 1.500.4 (or 1.700.2) written by the University of British Columbia, Image Power Inc, and others. More...

Detailed Description

Encodes JPEG2000 code stream.

Author

Stephen Gilbert

Date

2002-12-02

Definition in file enc_jpeg2000.c.

Macro Definition Documentation

JAS_1_700_2

#define JAS_1_700_2

Define for JAS.

Definition at line 14 of file enc_jpeg2000.c.

MAXOPTSSIZE

#define MAXOPTSSIZE   1024

Maximum size of options.

Definition at line 15 of file enc_jpeg2000.c.

Function Documentation

enc_jpeg2000()

int enc_jpeg2000	(	unsigned char *	cin,
		g2int	width,
		g2int	height,
		g2int	nbits,
		g2int	ltype,
		g2int	ratio,
		g2int	retry,
		char *	outjpc,
		g2int	jpclen
	)

This Function encodes a grayscale image into a JPEG2000 code stream specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using JasPer Software version 1.500.4 (or 1.700.2) written by the University of British Columbia, Image Power Inc, and others.

JasPer is available at http://www.ece.uvic.ca/~mdadams/jasper/.

Program History Log

Date	Programmer	Comments
2002-12-02	Gilbert	Initial
2004-12-16	Gilbert	Added retry argument allowing increased guard bits.

Parameters

cin	Packed matrix of Grayscale image values to encode.
width	width of image.
height	height of image.
nbits	depth (in bits) of image. i.e number of bits used to hold each data value.
ltype	indicator of lossless or lossy compression. 1, for lossy compression != 1, for lossless compression
ratio	target compression ratio. (ratio:1) Used only when ltype == 1.
retry	If 1 try increasing number of guard bits otherwise, no additional options.
outjpc	Output encoded JPEG2000 code stream.
jpclen	Number of bytes allocated for the output JPEG2000 code stream in outjpc.

Returns

• > 0 = Length in bytes of encoded JPEG2000 code stream
• -3 = Error decode jpeg2000 code stream.
• -5 = decoded image had multiple color components. Only grayscale is expected.

Note

Requires JasPer Software version 1.500.4 or 1.700.2 or later.

Author

Stephen Gilbert

Date

2002-12-02

Definition at line 57 of file enc_jpeg2000.c.

References MAXOPTSSIZE.

Referenced by jpcpack().