The main purpose of the classes and functions that support images is to allow handling of image buffers whose memory is mapped onto hardware (camera or USB drivers) without having to copy the data over. Many other libraries and frameworks are available that define more complete image classes and associated image processing and machine vision functions. Functions are here provided to allow you to reinterpret the raw image buffers as, e.g., OpenCV cv::Mat images without copying the image pixel data. For the purposes of creating demo displays, simple image copy, paste, drawing, text, etc into raw YUYV image buffers (which would typically be obtained from the USB driver and need to be filled with some pixel data to send over the USB link) are also provided.

The class that represents an image with a pixel buffer that the camera or USB hardware has direct memory access to (see VideoBuf) is called RawImage. To avoid defining pixel types yet again, as most image-related libraries already do, in RawImage we just use the definitions provided by Video4Linux2.

The functions that operate on RawImage are thus mostly intented for two purposes: 1) get pixel data out of RawImage and into another format like OpenCV, or from some other format into RawImage; 2) Allow simple drawings of lines, circles, rectangles, etc to make simple demo displays directly in the RawImage buffer that will be sent over the USB link.

Collaboration diagram for Minimalistic support for images in the core JeVois library:

Classes
class	jevois::RawImage
	A raw image as coming from a V4L2 Camera and/or being sent out to a USB Gadget. More...

Namespaces
	jevois::yuyv
	Helper YUYV colors.

	jevois::rgb565
	Helper RGB565 colors.

Modules
	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.

Enumerations
enum	jevois::rawimage::Font { jevois::rawimage::Font5x7, jevois::rawimage::Font6x10, jevois::rawimage::Font7x13, jevois::rawimage::Font8x13bold, jevois::rawimage::Font9x15bold, jevois::rawimage::Font10x20, jevois::rawimage::Font11x22, jevois::rawimage::Font12x22, jevois::rawimage::Font14x26, jevois::rawimage::Font15x28, jevois::rawimage::Font16x29, jevois::rawimage::Font20x38 }
	Available fonts for writeText() More...

Functions
void	convertYUYVtoRGB24 (unsigned int w, unsigned int h, unsigned char const src, unsigned char dst)
	Convert from YUYV to RGB, mostly intended for internal use. Use RawImage functions instead in most cases. More...

void	convertYUYVtoRGBYL (unsigned int w, unsigned int h, unsigned char const src, int dstrg, int dstby, int dstlum, int thresh, int inputbits)
	Convert from YUYV to RG, BY, and luminance for use by Saliency module in jevoisbase. For internal use. More...

cv::Mat	jevois::rawimage::cvImage (RawImage const &src)
	Create an OpenCV image from the existing RawImage data, sharing the pixel memory rather than copying it. More...

cv::Mat	jevois::rawimage::convertToCvGray (RawImage const &src)
	Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV gray byte. More...

cv::Mat	jevois::rawimage::convertToCvBGR (RawImage const &src)
	Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV BGR byte. More...

cv::Mat	jevois::rawimage::convertToCvRGB (RawImage const &src)
	Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV RGB byte. More...

cv::Mat	jevois::rawimage::convertToCvRGBA (RawImage const &src)
	Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV RGB-A byte. More...

void	jevois::rawimage::byteSwap (RawImage &img)
	Swap pairs of bytes in a RawImage. More...

void	jevois::rawimage::paste (RawImage const &src, RawImage &dest, int dx, int dy)
	Paste an image within another of same pixel type. More...

void	jevois::rawimage::pasteGreyToYUYV (cv::Mat const &src, RawImage &dest, int dx, int dy)
	Paste a grey byte image into a YUYV image. More...

void	jevois::rawimage::pasteBGRtoYUYV (cv::Mat const &src, RawImage &dst, int dx, int dy)
	Paste a BGR byte image into a YUYV image. More...

void	jevois::rawimage::pasteRGBtoYUYV (cv::Mat const &src, RawImage &dst, int dx, int dy)
	Paste a RGB byte image into a YUYV image. More...

void	jevois::rawimage::roipaste (RawImage const &src, int x, int y, unsigned int w, unsigned int h, RawImage &dest, int dx, int dy)
	Paste an ROI from an image to within another of same pixel type. More...

void	jevois::rawimage::drawDisk (RawImage &img, int x, int y, unsigned int rad, unsigned int col)
	Draw a disk in a YUYV image. More...

void	jevois::rawimage::drawCircle (RawImage &img, int x, int y, unsigned int rad, unsigned int thick, unsigned int col)
	Draw a circle in a YUYV image. More...

bool	jevois::rawimage::clipLine (int wxmin, int wymin, int wxmax, int wymax, int &x1, int &y1, int &x2, int &y2)
	Clip a line to fit inside a viewport [wxmin...wxmax[ x [wymin...wymax[. More...

void	jevois::rawimage::drawLine (RawImage &img, int x1, int y1, int x2, int y2, unsigned int thick, unsigned int col)
	Draw a line in a YUYV image. More...

void	jevois::rawimage::drawRect (RawImage &img, int x, int y, unsigned int w, unsigned int h, unsigned int thick, unsigned int col)
	Draw a rectangle in a YUYV image. More...

void	jevois::rawimage::drawRect (RawImage &img, int x, int y, unsigned int w, unsigned int h, unsigned int col)
	Draw a rectangle in a YUYV image. More...

void	jevois::rawimage::drawFilledRect (RawImage &img, int x, int y, unsigned int w, unsigned int h, unsigned int col)
	Draw a filled rectangle in a YUYV image. More...

void	jevois::rawimage::writeText (RawImage &img, std::string const &txt, int x, int y, unsigned int col, Font font=Font6x10)
	Write some text in an image. More...

void	jevois::rawimage::writeText (RawImage &img, char const *txt, int x, int y, unsigned int col, Font font=Font6x10)
	Write some text in an image. More...

void	jevois::rawimage::convertCvBGRtoRawImage (cv::Mat const &src, RawImage &dst, int quality)
	Convert a BGR cv::Mat to RawImage with already-allocated pixels and pixel type. More...

void	jevois::rawimage::convertCvRGBtoRawImage (cv::Mat const &src, RawImage &dst, int quality)
	Convert a RGB cv::Mat to RawImage with already-allocated pixels and pixel type. More...

void	jevois::rawimage::convertCvRGBAtoRawImage (cv::Mat const &src, RawImage &dst, int quality)
	Convert an RGBA cv::Mat to RawImage with already-allocated pixels and pixel type. More...

void	jevois::rawimage::convertCvGRAYtoRawImage (cv::Mat const &src, RawImage &dst, int quality)
	Convert a Gray cv::Mat to RawImage with already-allocated pixels and pixel type. More...

void	jevois::rawimage::unpackCvRGBAtoGrayRawImage (cv::Mat const &src, RawImage &dst)
	Split an RGBA cv::Mat into a 4x taller grey RawImage with already-allocated pixels. More...

void	jevois::rawimage::hFlipYUYV (RawImage &img)
	Flip a YUYV RawImage horizontally while preserving color information. More...

void	jevois::rawimage::convertCvRGBtoCvYUYV (cv::Mat const &src, cv::Mat &dst)
	OpenCV does not provide conversion from RGB to YUYV in cvtColor(), so this function provides it. More...

void	jevois::rawimage::convertCvBGRtoCvYUYV (cv::Mat const &src, cv::Mat &dst)
	OpenCV does not provide conversion from BGR to YUYV in cvtColor(), so this function provides it. More...

void	jevois::rawimage::convertCvGRAYtoCvYUYV (cv::Mat const &src, cv::Mat &dst)
	OpenCV does not provide conversion from GRAY to YUYV in cvtColor(), so this function provides it. More...

void	jevois::rawimage::convertCvRGBAtoCvYUYV (cv::Mat const &src, cv::Mat &dst)
	OpenCV does not provide conversion from RGBA to YUYV in cvtColor(), so this function provides it. More...

cv::Mat	jevois::rescaleCv (cv::Mat const &img, cv::Size const &newdims)
	Rescale an OpenCV image, choosing the right kind of interpolation. More...

Enumeration Type Documentation

◆ Font

enum jevois::rawimage::Font

Available fonts for writeText()

Enumerator
Font5x7
Font6x10
Font7x13
Font8x13bold
Font9x15bold
Font10x20
Font11x22
Font12x22
Font14x26
Font15x28
Font16x29
Font20x38

Definition at line 152 of file RawImageOps.H.

Function Documentation

◆ byteSwap()

void jevois::rawimage::byteSwap ( jevois::RawImage & img )

Swap pairs of bytes in a RawImage.

This should never be needed, except maybe for RGB565 images, mainly for internal debugging, or to directly pass an RGB565 camera image (which is big endian) to USB (which assumes little endian when using RGBP UVC format). This function is NEON-accelerated when compiled for the platform hardware.

Definition at line 368 of file RawImageOps.C.

References jevois::async(), jevois::RawImage::bytesize(), jevois::RawImage::bytesperpix(), jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ clipLine()

bool jevois::rawimage::clipLine	(	int	wxmin,
		int	wymin,
		int	wxmax,
		int	wymax,
		int &	x1,
		int &	y1,
		int &	x2,
		int &	y2
	)

Clip a line to fit inside a viewport [wxmin...wxmax[ x [wymin...wymax[.

This uses the Liang-Barsky line clipping algorithm. Returns false if the line is entirely outside the viewport (nothing to draw).

Definition at line 533 of file RawImageOps.C.

Referenced by jevois::rawimage::drawLine().

◆ convertCvBGRtoCvYUYV()

void jevois::rawimage::convertCvBGRtoCvYUYV	(	cv::Mat const &	src,
		cv::Mat &	dst
	)

OpenCV does not provide conversion from BGR to YUYV in cvtColor(), so this function provides it.

Definition at line 1026 of file RawImageOps.C.

References jevois::cvtypestr(), and LFATAL.

◆ convertCvBGRtoRawImage()

void jevois::rawimage::convertCvBGRtoRawImage	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality
	)

Convert a BGR cv::Mat to RawImage with already-allocated pixels and pixel type.

This is used to output video frames over USB from internally computed results in opencv BGR format. dst should already have an allocated pixel buffer (typically, it should be obtained from the USB gadget), and its size must match that of the src image.

Supported dst pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_MJPG
V4L2_PIX_FMT_BGR24

quality is used only when dst is MJPG and should be between 1 and 100.

Definition at line 1266 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::compressBGRtoJpeg(), jevois::rawimage::cvImage(), jevois::cvtypestr(), jevois::fccstr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

Referenced by jevois::MovieInput::get(), jevois::MovieInput::get2(), TutorialConvert::process(), jevois::OutputFrame::sendCvBGR(), and jevois::OutputFrame::sendScaledCvBGR().

◆ convertCvGRAYtoCvYUYV()

void jevois::rawimage::convertCvGRAYtoCvYUYV	(	cv::Mat const &	src,
		cv::Mat &	dst
	)

OpenCV does not provide conversion from GRAY to YUYV in cvtColor(), so this function provides it.

Definition at line 1184 of file RawImageOps.C.

References jevois::cvtypestr(), and LFATAL.

◆ convertCvGRAYtoRawImage()

void jevois::rawimage::convertCvGRAYtoRawImage	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality
	)

Convert a Gray cv::Mat to RawImage with already-allocated pixels and pixel type.

This is used to output video frames over USB from internally computed results in opencv Gray format. dst should already have an allocated pixel buffer (typically, it should be obtained from the USB gadget), and its size must match that of the src image.

Supported dst pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_MJPG
V4L2_PIX_FMT_BGR24

quality is used only when dst is MJPG and should be between 1 and 100.

Definition at line 1359 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::compressGRAYtoJpeg(), jevois::rawimage::cvImage(), jevois::cvtypestr(), jevois::fccstr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

Referenced by jevois::OutputFrame::sendCvGRAY(), and jevois::OutputFrame::sendScaledCvGRAY().

◆ convertCvRGBAtoCvYUYV()

void jevois::rawimage::convertCvRGBAtoCvYUYV	(	cv::Mat const &	src,
		cv::Mat &	dst
	)

OpenCV does not provide conversion from RGBA to YUYV in cvtColor(), so this function provides it.

Definition at line 1256 of file RawImageOps.C.

References jevois::cvtypestr(), and LFATAL.

◆ convertCvRGBAtoRawImage()

void jevois::rawimage::convertCvRGBAtoRawImage	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality
	)

Convert an RGBA cv::Mat to RawImage with already-allocated pixels and pixel type.

This is used to output video frames over USB from internally computed results in opencv RGB-A format (which is often the format of choice for NEON or OpenGL processing). dst should already have an allocated pixel buffer (typically, it should be obtained from the USB gadget), and its size must match that of the src image.

Supported dst pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_MJPG
V4L2_PIX_FMT_BGR24

quality is used only when dst is MJPG and should be between 1 and 100.

Definition at line 1337 of file RawImageOps.C.

References jevois::compressRGBAtoJpeg(), jevois::rawimage::cvImage(), jevois::cvtypestr(), jevois::fccstr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::OutputFrame::sendCvRGBA(), and jevois::OutputFrame::sendScaledCvRGBA().

◆ convertCvRGBtoCvYUYV()

void jevois::rawimage::convertCvRGBtoCvYUYV	(	cv::Mat const &	src,
		cv::Mat &	dst
	)

OpenCV does not provide conversion from RGB to YUYV in cvtColor(), so this function provides it.

Definition at line 1112 of file RawImageOps.C.

References jevois::cvtypestr(), and LFATAL.

◆ convertCvRGBtoRawImage()

void jevois::rawimage::convertCvRGBtoRawImage	(	cv::Mat const &	src,
		RawImage &	dst,
		int	quality
	)

Convert a RGB cv::Mat to RawImage with already-allocated pixels and pixel type.

This is used to output video frames over USB from internally computed results in opencv BGR format. dst should already have an allocated pixel buffer (typically, it should be obtained from the USB gadget), and its size must match that of the src image.

Supported dst pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_MJPG
V4L2_PIX_FMT_BGR24

quality is used only when dst is MJPG and should be between 1 and 100.

Definition at line 1289 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::compressRGBtoJpeg(), jevois::rawimage::cvImage(), jevois::cvtypestr(), jevois::fccstr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

Referenced by jevois::OutputFrame::sendCvRGB(), and jevois::OutputFrame::sendScaledCvRGB().

◆ convertToCvBGR()

cv::Mat jevois::rawimage::convertToCvBGR ( jevois::RawImage const & src )

Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV BGR byte.

For historical reasons, BGR is the "native" color format of OpenCV, check whether your algorithm needs RGB or BGR and use the appropriate conversion for it.

Supported RawImage pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_BGR24

Definition at line 282 of file RawImageOps.C.

References jevois::rawimage::cvImage(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::InputFrame::getCvBGR(), jevois::InputFrame::getCvBGRp(), TutorialConvert::process(), jevois::dnn::PreProcessor::process(), and jevois::MovieOutput::send().

◆ convertToCvGray()

cv::Mat jevois::rawimage::convertToCvGray ( jevois::RawImage const & src )

Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV gray byte.

Supported RawImage pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_BGR24

Definition at line 246 of file RawImageOps.C.

References jevois::rawimage::cvImage(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::InputFrame::getCvGRAY(), jevois::InputFrame::getCvGRAYp(), TutorialEdgeDetection::process(), and TutorialEdgeDetectionX4::process().

◆ convertToCvRGB()

cv::Mat jevois::rawimage::convertToCvRGB ( jevois::RawImage const & src )

Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV RGB byte.

For historical reasons, BGR is the "native" color format of OpenCV, not RGB as created here, check whether your algorithm needs RGB or BGR and use the appropriate conversion for it.

Supported RawImage pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_BGR24

Definition at line 307 of file RawImageOps.C.

References jevois::rawimage::cvImage(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::InputFrame::getCvRGB(), jevois::InputFrame::getCvRGBp(), and jevois::dnn::PreProcessor::process().

◆ convertToCvRGBA()

cv::Mat jevois::rawimage::convertToCvRGBA ( jevois::RawImage const & src )

Convert RawImage to OpenCV doing color conversion from any RawImage source pixel to OpenCV RGB-A byte.

RGBA is seldom used by OpenCV itself, but is useful for many NEON and OpenGL (GPU) algorithms. For these algorithms, we here just use cv::Mat as a convenient container for raw pixel data.

Supported RawImage pixel formats:

V4L2_PIX_FMT_YUYV
V4L2_PIX_FMT_GREY
V4L2_PIX_FMT_SRGGB8 (Bayer)
V4L2_PIX_FMT_RGB565
V4L2_PIX_FMT_BGR24

Definition at line 332 of file RawImageOps.C.

References jevois::rawimage::cvImage(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::InputFrame::getCvRGBA(), and jevois::InputFrame::getCvRGBAp().

◆ convertYUYVtoRGB24()

void convertYUYVtoRGB24	(	unsigned int	w,
		unsigned int	h,
		unsigned char const *	src,
		unsigned char *	dst
	)

Convert from YUYV to RGB, mostly intended for internal use. Use RawImage functions instead in most cases.

This code is modified from here: http://pastebin.com/mDcwqJV3 Memory should have been allocated by caller.

Definition at line 23 of file ColorConversion.c.

References CLAMP, G, and h.

◆ convertYUYVtoRGBYL()

void convertYUYVtoRGBYL	(	unsigned int	w,
		unsigned int	h,
		unsigned char const *	src,
		int *	dstrg,
		int *	dstby,
		int *	dstlum,
		int	thresh,
		int	inputbits
	)

Convert from YUYV to RG, BY, and luminance for use by Saliency module in jevoisbase. For internal use.

Definition at line 89 of file ColorConversion.c.

References convertYUYVtoRGBYLinternal(), G, and h.

◆ cvImage()

cv::Mat jevois::rawimage::cvImage ( jevois::RawImage const & src )

Create an OpenCV image from the existing RawImage data, sharing the pixel memory rather than copying it.

The pixel data is not copied, just pointed to, and no pixel format conversion is done. You should destroy the cv::Mat before the RawImage to avoid that your cv::Mat ends up with de-allocated pixel memory.

Definition at line 31 of file RawImageOps.C.

References jevois::RawImage::buf, jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::v4l2BytesPerPix(), and jevois::RawImage::width.

Referenced by jevois::rawimage::convertBayerToYUYV(), jevois::rawimage::convertCvBGRtoRawImage(), jevois::rawimage::convertCvGRAYtoRawImage(), jevois::rawimage::convertCvRGBAtoRawImage(), jevois::rawimage::convertCvRGBtoRawImage(), jevois::rawimage::convertGreyToYUYV(), jevois::rawimage::convertToCvBGR(), jevois::rawimage::convertToCvGray(), jevois::rawimage::convertToCvRGB(), jevois::rawimage::convertToCvRGBA(), TutorialEdgeDetection::process(), and jevois::dnn::PreProcessor::process().

◆ drawCircle()

void jevois::rawimage::drawCircle	(	jevois::RawImage &	img,
		int	x,
		int	y,
		unsigned int	rad,
		unsigned int	thick,
		unsigned int	col
	)

Draw a circle in a YUYV image.

Definition at line 483 of file RawImageOps.C.

References jevois::rawimage::drawDisk().

Referenced by jevois::dnn::PostProcessorYuNet::report().

◆ drawDisk()

void jevois::rawimage::drawDisk	(	jevois::RawImage &	img,
		int	x,
		int	y,
		unsigned int	rad,
		unsigned int	col
	)

Draw a disk in a YUYV image.

Definition at line 465 of file RawImageOps.C.

References jevois::RawImage::coordsOk(), jevois::RawImage::pixelsw(), and jevois::RawImage::width.

Referenced by jevois::rawimage::drawCircle(), jevois::drawErrorImage(), and jevois::rawimage::drawLine().

◆ drawFilledRect()

void jevois::rawimage::drawFilledRect	(	jevois::RawImage &	img,
		int	x,
		int	y,
		unsigned int	w,
		unsigned int	h,
		unsigned int	col
	)

Draw a filled rectangle in a YUYV image.

This is really not flexible and is optimized for speed only. col will be used for both YU and YV pixels. For more demanding drawings, use openCV functions. The pixels drawn go from (x,y) included to (x+w-1,y+h-1) included. If w or h is 0, it is replaced by 1.

Definition at line 646 of file RawImageOps.C.

References h, jevois::RawImage::height, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ drawLine()

void jevois::rawimage::drawLine	(	jevois::RawImage &	img,
		int	x1,
		int	y1,
		int	x2,
		int	y2,
		unsigned int	thick,
		unsigned int	col
	)

Draw a line in a YUYV image.

Definition at line 564 of file RawImageOps.C.

References jevois::rawimage::clipLine(), jevois::rawimage::drawDisk(), h, jevois::RawImage::height, LFATAL, and jevois::RawImage::width.

Referenced by jevois::drawErrorImage(), jevois::rawimage::drawRect(), and jevois::dnn::PostProcessorYuNet::report().

◆ drawRect() [1/2]

void jevois::rawimage::drawRect	(	jevois::RawImage &	img,
		int	x,
		int	y,
		unsigned int	w,
		unsigned int	h,
		unsigned int	col
	)

Draw a rectangle in a YUYV image.

This is really not flexible and is optimized for speed only. col will be used for both YU and YV pixels. For more demanding drawings, use openCV functions. The pixels drawn go from (x,y) included to (x+w-1,y+h-1) included. If w or h is 0, it is replaced by 1.

Definition at line 624 of file RawImageOps.C.

References h, jevois::RawImage::height, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ drawRect() [2/2]

void jevois::rawimage::drawRect	(	jevois::RawImage &	img,
		int	x,
		int	y,
		unsigned int	w,
		unsigned int	h,
		unsigned int	thick,
		unsigned int	col
	)

Draw a rectangle in a YUYV image.

The pixels drawn go from (x,y) included to (x+w-1,y+h-1) included. If w or h is 0, it is replaced by 1.

Definition at line 607 of file RawImageOps.C.

References jevois::rawimage::drawLine(), and h.

Referenced by jevois::dnn::PostProcessorDetect::report(), jevois::dnn::PostProcessorYuNet::report(), and jevois::dnn::PreProcessor::sendreport().

◆ hFlipYUYV()

void jevois::rawimage::hFlipYUYV ( RawImage & img )

Flip a YUYV RawImage horizontally while preserving color information.

This function is to allow one to use JeVois with the PhotoBooth app on a Mac, whih flips the image horizontally (about the vertical axis). Only YUYV pixels are supported. You might be able to use cv::flip() from OpenCV instead with other pixel types.

Definition at line 1416 of file RawImageOps.C.

References jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ paste()

void jevois::rawimage::paste	(	jevois::RawImage const &	src,
		jevois::RawImage &	dest,
		int	dx,
		int	dy
	)

Paste an image within another of same pixel type.

To keep this function fast, throws if the source image does not fully fit within the destination image, or if the two images do not have the same pixel format.

Definition at line 403 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixels(), jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ pasteBGRtoYUYV()

void jevois::rawimage::pasteBGRtoYUYV	(	cv::Mat const &	src,
		jevois::RawImage &	dst,
		int	dx,
		int	dy
	)

Paste a BGR byte image into a YUYV image.

Definition at line 1036 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::cvtypestr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ pasteGreyToYUYV()

void jevois::rawimage::pasteGreyToYUYV	(	cv::Mat const &	src,
		jevois::RawImage &	dest,
		int	dx,
		int	dy
	)

Paste a grey byte image into a YUYV image.

Definition at line 448 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ pasteRGBtoYUYV()

void jevois::rawimage::pasteRGBtoYUYV	(	cv::Mat const &	src,
		jevois::RawImage &	dst,
		int	dx,
		int	dy
	)

Paste a RGB byte image into a YUYV image.

Definition at line 1122 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::cvtypestr(), jevois::RawImage::fmt, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ rescaleCv()

cv::Mat jevois::rescaleCv	(	cv::Mat const &	img,
		cv::Size const &	newdims
	)

Rescale an OpenCV image, choosing the right kind of interpolation.

Definition at line 1624 of file RawImageOps.C.

Referenced by jevois::ImGuiImage::load(), jevois::OutputFrame::sendScaledCvBGR(), jevois::OutputFrame::sendScaledCvGRAY(), jevois::OutputFrame::sendScaledCvRGB(), and jevois::OutputFrame::sendScaledCvRGBA().

◆ roipaste()

void jevois::rawimage::roipaste	(	jevois::RawImage const &	src,
		int	x,
		int	y,
		unsigned int	w,
		unsigned int	h,
		jevois::RawImage &	dest,
		int	dx,
		int	dy
	)

Paste an ROI from an image to within another of same pixel type.

To keep this function fast, throws if the source image does not fully fit within the destination image or if the pixel formats differ.

Definition at line 425 of file RawImageOps.C.

References jevois::RawImage::bytesperpix(), jevois::RawImage::fmt, h, jevois::RawImage::height, LFATAL, jevois::RawImage::pixels(), jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ unpackCvRGBAtoGrayRawImage()

void jevois::rawimage::unpackCvRGBAtoGrayRawImage	(	cv::Mat const &	src,
		RawImage &	dst
	)

Split an RGBA cv::Mat into a 4x taller grey RawImage with already-allocated pixels.

This is used to run GPU shaders that apply different filters to an image and store their results separately into the R, G, B and A components of an RGBA output image. Here, we just unpack the 4 components and stuff them into the output image one above the other: R on top, then G below it, then B below it, then A below it. The destination RawImage must be at least as wide as src and at least 4 times as tall as src, and must have V4L2_PIX_FMT_GREY pixels.

Definition at line 1312 of file RawImageOps.C.

References jevois::async(), jevois::cvtypestr(), jevois::RawImage::fmt, h, jevois::RawImage::height, LFATAL, jevois::RawImage::pixelsw(), and jevois::RawImage::width.

◆ writeText() [1/2]

void jevois::rawimage::writeText	(	jevois::RawImage &	img,
		char const *	txt,
		int	x,
		int	y,
		unsigned int	col,
		Font	font = `Font6x10`
	)

Write some text in an image.

Definition at line 696 of file RawImageOps.C.

◆ writeText() [2/2]

void jevois::rawimage::writeText	(	jevois::RawImage &	img,
		std::string const &	txt,
		int	x,
		int	y,
		unsigned int	col,
		Font	font = `Font6x10`
	)

Write some text in an image.

Definition at line 689 of file RawImageOps.C.

Referenced by jevois::drawErrorImage(), __MODULE__::process(), jevois::dnn::Pipeline::process(), jevois::dnn::PostProcessorClassify::report(), jevois::dnn::PostProcessorDetect::report(), and jevois::dnn::PostProcessorYuNet::report().

Classes

Namespaces

Modules

Enumerations

Functions

Enumeration Type Documentation

◆ Font

Function Documentation

◆ byteSwap()

◆ clipLine()

◆ convertCvBGRtoCvYUYV()

◆ convertCvBGRtoRawImage()

◆ convertCvGRAYtoCvYUYV()

◆ convertCvGRAYtoRawImage()

◆ convertCvRGBAtoCvYUYV()

◆ convertCvRGBAtoRawImage()

◆ convertCvRGBtoCvYUYV()

◆ convertCvRGBtoRawImage()

◆ convertToCvBGR()

◆ convertToCvGray()

◆ convertToCvRGB()

◆ convertToCvRGBA()

◆ convertYUYVtoRGB24()

◆ convertYUYVtoRGBYL()

◆ cvImage()

◆ drawCircle()

◆ drawDisk()

◆ drawFilledRect()

◆ drawLine()

◆ drawRect() [1/2]

◆ drawRect() [2/2]

◆ hFlipYUYV()

◆ paste()

◆ pasteBGRtoYUYV()

◆ pasteGreyToYUYV()

◆ pasteRGBtoYUYV()

◆ rescaleCv()

◆ roipaste()

◆ unpackCvRGBAtoGrayRawImage()

◆ writeText() [1/2]

◆ writeText() [2/2]