Jpeg-related classes and functions

Jpeg classes and functions, mainly used to support sending MJPEG video output over USB from raw uncompressed images captured by a camera.

Collaboration diagram for Jpeg-related classes and functions:

Classes
class	jevois::JpegCompressor
	Simple singleton wrapper over a turbojpeg compressor. More...

Functions
void	jevois::convertYUYVtoYUV422 (unsigned char const *src, int width, int height, unsigned char *dst)
	Helper to convert from packed YUYV to planar YUV422. More...
unsigned long	jevois::compressBGRtoJpeg (unsigned char const *src, int width, int height, unsigned char *dst, int quality=75)
	Compress raw pixel buffer to jpeg. More...
void	jevois::compressBGRtoJpeg (cv::Mat const &src, RawImage &dst, int quality=75)
	Compress a BGR cv::Mat into an output JPEG jevois::RawImage. More...
unsigned long	jevois::compressRGBtoJpeg (unsigned char const *src, int width, int height, unsigned char *dst, int quality=75)
	Compress raw pixel buffer to jpeg. More...
void	jevois::compressRGBtoJpeg (cv::Mat const &src, RawImage &dst, int quality=75)
	Compress a RGB cv::Mat into an output JPEG jevois::RawImage. More...
unsigned long	jevois::compressRGBAtoJpeg (unsigned char const *src, int width, int height, unsigned char *dst, int quality=75)
	Compress raw pixel buffer to jpeg. More...
void	jevois::compressRGBAtoJpeg (cv::Mat const &src, RawImage &dst, int quality=75)
	Compress an RGBA cv::Mat into an output JPEG jevois::RawImage. More...
unsigned long	jevois::compressGRAYtoJpeg (unsigned char const *src, int width, int height, unsigned char *dst, int quality=75)
	Compress raw pixel buffer to jpeg. More...
void	jevois::compressGRAYtoJpeg (cv::Mat const &src, RawImage &dst, int quality=75)
	Compress a Gray cv::Mat into an output JPEG jevois::RawImage. More...

Function Documentation

compressBGRtoJpeg() [1/2]

void jevois::compressBGRtoJpeg	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality = 75
	)

Compress a BGR cv::Mat into an output JPEG jevois::RawImage.

The dst RawImage should have an allocated buffer, typically this is intended for use with a RawImage that was obtained from the UVC gadget.

Definition at line 108 of file Jpeg.C.

References jevois::RawImage::buf, jevois::compressBGRtoJpeg(), and jevois::RawImage::pixelsw().

compressBGRtoJpeg() [2/2]

unsigned long jevois::compressBGRtoJpeg	(	unsigned char const *	src,
		int	width,
		int	height,
		unsigned char *	dst,
		int	quality = 75
	)

Compress raw pixel buffer to jpeg.

The compressed size is returned. The dst buffer should have been allocated by caller, with size at least width * height * 2 bytes. quality should be between 1 (worst) and 100 (best).

Definition at line 52 of file Jpeg.C.

References jevois::JpegCompressor::compressor(), and jevois::Singleton< JpegCompressor >::instance().

Referenced by jevois::compressBGRtoJpeg(), and jevois::rawimage::convertCvBGRtoRawImage().

compressGRAYtoJpeg() [1/2]

void jevois::compressGRAYtoJpeg	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality = 75
	)

Compress a Gray cv::Mat into an output JPEG jevois::RawImage.

The dst RawImage should have an allocated buffer, typically this is intended for use with a RawImage that was obtained from the UVC gadget.

Definition at line 126 of file Jpeg.C.

References jevois::RawImage::buf, jevois::compressGRAYtoJpeg(), and jevois::RawImage::pixelsw().

compressGRAYtoJpeg() [2/2]

unsigned long jevois::compressGRAYtoJpeg	(	unsigned char const *	src,
		int	width,
		int	height,
		unsigned char *	dst,
		int	quality = 75
	)

Compress raw pixel buffer to jpeg.

The compressed size is returned. The dst buffer should have been allocated by caller, with size at least width * height * 2 bytes. quality should be between 1 (worst) and 100 (best).

Definition at line 94 of file Jpeg.C.

References jevois::JpegCompressor::compressor(), and jevois::Singleton< JpegCompressor >::instance().

Referenced by jevois::compressGRAYtoJpeg(), and jevois::rawimage::convertCvGRAYtoRawImage().

compressRGBAtoJpeg() [1/2]

void jevois::compressRGBAtoJpeg	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality = 75
	)

Compress an RGBA cv::Mat into an output JPEG jevois::RawImage.

The dst RawImage should have an allocated buffer, typically this is intended for use with a RawImage that was obtained from the UVC gadget.

Definition at line 120 of file Jpeg.C.

References jevois::RawImage::buf, jevois::compressRGBAtoJpeg(), and jevois::RawImage::pixelsw().

compressRGBAtoJpeg() [2/2]

unsigned long jevois::compressRGBAtoJpeg	(	unsigned char const *	src,
		int	width,
		int	height,
		unsigned char *	dst,
		int	quality = 75
	)

Compress raw pixel buffer to jpeg.

The compressed size is returned. The dst buffer should have been allocated by caller, with size at least width * height * 2 bytes. quality should be between 1 (worst) and 100 (best).

Definition at line 80 of file Jpeg.C.

References jevois::JpegCompressor::compressor(), and jevois::Singleton< JpegCompressor >::instance().

Referenced by jevois::compressRGBAtoJpeg(), and jevois::rawimage::convertCvRGBAtoRawImage().

compressRGBtoJpeg() [1/2]

void jevois::compressRGBtoJpeg	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality = 75
	)

Compress a RGB cv::Mat into an output JPEG jevois::RawImage.

The dst RawImage should have an allocated buffer, typically this is intended for use with a RawImage that was obtained from the UVC gadget.

Definition at line 114 of file Jpeg.C.

References jevois::RawImage::buf, jevois::compressRGBtoJpeg(), and jevois::RawImage::pixelsw().

compressRGBtoJpeg() [2/2]

unsigned long jevois::compressRGBtoJpeg	(	unsigned char const *	src,
		int	width,
		int	height,
		unsigned char *	dst,
		int	quality = 75
	)

Compress raw pixel buffer to jpeg.

The compressed size is returned. The dst buffer should have been allocated by caller, with size at least width * height * 2 bytes. quality should be between 1 (worst) and 100 (best).

Definition at line 66 of file Jpeg.C.

References jevois::JpegCompressor::compressor(), and jevois::Singleton< JpegCompressor >::instance().

Referenced by jevois::compressRGBtoJpeg(), and jevois::rawimage::convertCvRGBtoRawImage().

convertYUYVtoYUV422()

void jevois::convertYUYVtoYUV422	(	unsigned char const *	src,
		int	width,
		int	height,
		unsigned char *	dst
	)

Helper to convert from packed YUYV to planar YUV422.

Memory must have been allocated by caller.

Definition at line 35 of file Jpeg.C.