usb_cam Namespace Reference

Classes
class	UsbCam
class	UsbCamNode
Functions
static unsigned char	CLIPVALUE (int val)
static void	errno_exit (const char *s)
static void	mono102mono8 (char *RAW, char *MONO, int NumPixels)
void	rgb242rgb (char *YUV, char *RGB, int NumPixels)
void	uyvy2rgb (char *YUV, char *RGB, int NumPixels)
static int	xioctl (int fd, int request, void *arg)
static void	YUV2RGB (const unsigned char y, const unsigned char u, const unsigned char v, unsigned char *r, unsigned char *g, unsigned char *b)
static void	yuyv2rgb (char *YUV, char *RGB, int NumPixels)
Variables
const int	clipping_table_offset = 128
const unsigned char	uchar_clipping_table []

---

Function Documentation

static unsigned char usb_cam::CLIPVALUE

(

int

val

)

[static]

Clip a value to the range 0<val<255. For speed this is done using an array, so can only cope with numbers in the range -128<val<383.

Definition at line 239 of file usb_cam.cpp.

static void usb_cam::errno_exit

(

const char *

s

)

[static]

Definition at line 61 of file usb_cam.cpp.

static void usb_cam::mono102mono8	(	char *	RAW,
		char *	MONO,
		int	NumPixels
	)		[static]

Definition at line 317 of file usb_cam.cpp.

void usb_cam::rgb242rgb	(	char *	YUV,
		char *	RGB,
		int	NumPixels
	)

Definition at line 350 of file usb_cam.cpp.

void usb_cam::uyvy2rgb	(	char *	YUV,
		char *	RGB,
		int	NumPixels
	)

Definition at line 295 of file usb_cam.cpp.

static int usb_cam::xioctl	(	int	fd,
		int	request,
		void *	arg
	)		[static]

Definition at line 67 of file usb_cam.cpp.

static void usb_cam::YUV2RGB	(	const unsigned char	y,
		const unsigned char	u,
		const unsigned char	v,
		unsigned char *	r,
		unsigned char *	g,
		unsigned char *	b
	)		[static]

Conversion from YUV to RGB. The normal conversion matrix is due to Julien (surname unknown):

[ R ] [ 1.0 0.0 1.403 ] [ Y ] [ G ] = [ 1.0 -0.344 -0.714 ] [ U ] [ B ] [ 1.0 1.770 0.0 ] [ V ]

and the firewire one is similar:

[ R ] [ 1.0 0.0 0.700 ] [ Y ] [ G ] = [ 1.0 -0.198 -0.291 ] [ U ] [ B ] [ 1.0 1.015 0.0 ] [ V ]

Corrected by BJT (coriander's transforms RGB->YUV and YUV->RGB do not get you back to the same RGB!) [ R ] [ 1.0 0.0 1.136 ] [ Y ] [ G ] = [ 1.0 -0.396 -0.578 ] [ U ] [ B ] [ 1.0 2.041 0.002 ] [ V ]

Definition at line 270 of file usb_cam.cpp.

static void usb_cam::yuyv2rgb	(	char *	YUV,
		char *	RGB,
		int	NumPixels
	)		[static]

Definition at line 327 of file usb_cam.cpp.

---

Variable Documentation

const int usb_cam::clipping_table_offset = 128

Definition at line 234 of file usb_cam.cpp.

const unsigned char usb_cam::uchar_clipping_table[]

Definition at line 78 of file usb_cam.cpp.