Contours extraction

Functions
VISP_EXPORT void	VISP_NAMESPACE_NAME::drawContours (VISP_NAMESPACE_ADDRESSING vpImage< unsigned char > &I, const std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &contours, unsigned char grayValue=255)
VISP_EXPORT void	VISP_NAMESPACE_NAME::drawContours (VISP_NAMESPACE_ADDRESSING vpImage< VISP_NAMESPACE_ADDRESSING vpRGBa > &I, const std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &contours, const VISP_NAMESPACE_ADDRESSING vpColor &color)
VISP_EXPORT void	VISP_NAMESPACE_NAME::findContours (const VISP_NAMESPACE_ADDRESSING vpImage< unsigned char > &I_original, vpContour &contours, std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &contourPts, const vpContourRetrievalType &retrievalMode=CONTOUR_RETR_TREE)

Detailed Description

Contours extraction.

If you are interested in contours extraction, you may have a look at

• Tutorial: Contours extraction from a binary image
• Practical example: count the number of coins in an image

Function Documentation

drawContours() [1/2]

VISP_EXPORT void VISP_NAMESPACE_NAME::drawContours	(	VISP_NAMESPACE_ADDRESSING vpImage< unsigned char > &	I,
		const std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &	contours,
		unsigned char	grayValue = 255 )

Draw the input contours on the binary image.

Parameters

I	: Grayscale image where we want to draw the input contours.
contours	: Detected contours.
grayValue	: Drawing grayscale color.

Examples

testContours.cpp, tutorial-contour.cpp, and tutorial-count-coins.cpp.

drawContours() [2/2]

VISP_EXPORT void VISP_NAMESPACE_NAME::drawContours	(	VISP_NAMESPACE_ADDRESSING vpImage< VISP_NAMESPACE_ADDRESSING vpRGBa > &	I,
		const std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &	contours,
		const VISP_NAMESPACE_ADDRESSING vpColor &	color )

Draw the input contours on the color image.

Parameters

I	: Color image where we want to draw the input contours.
contours	: Detected contours.
color	: Drawing color.

findContours()

VISP_EXPORT void VISP_NAMESPACE_NAME::findContours	(	const VISP_NAMESPACE_ADDRESSING vpImage< unsigned char > &	I_original,
		vpContour &	contours,
		std::vector< std::vector< VISP_NAMESPACE_ADDRESSING vpImagePoint > > &	contourPts,
		const vpContourRetrievalType &	retrievalMode = CONTOUR_RETR_TREE )

Extract contours from a binary image.

Parameters

I_original	: Input binary image (0 means background, 1 means foreground, other values are not allowed).
contours	: Detected contours.
contourPts	: List of contours, each contour contains a list of contour points.
retrievalMode	: Contour retrieval mode.

Examples

testContours.cpp, tutorial-contour.cpp, and tutorial-count-coins.cpp.

References CONTOUR_RETR_TREE.