Crop Image

Functions for cropping images. More...

Collaboration diagram for Crop Image:

Files
file	crop.h

Functions
int	icv_rect (icv_image_t *img, size_t xorig, size_t yorig, size_t xnum, size_t ynum)
int	icv_crop (icv_image_t *img, size_t ulx, size_t uly, size_t urx, size_t ury, size_t lrx, size_t lry, size_t llx, size_t lly, size_t ynum, size_t xnum)

Detailed Description

Functions for cropping images.

There are currently two types of cropping: rectangular and skewed.

Function Documentation

icv_rect()

int icv_rect	(	icv_image_t *	img,
		size_t	xorig,
		size_t	yorig,
		size_t	xnum,
		size_t	ynum
	)

This function crops an input image. Note : (0,0) corresponds to the Bottom Left of an Image.

Parameters

img	Input image struct to be cropped.
xorig	X-Coordinate of offset of image to be extracted from.
yorig	Y-Coordinate of offset of image to be extracted from.
xnum	Length of the output image to be extracted from input data in horizontal direction.
ynum	Length of the output image to be extracted from input data in vertical direction.

Returns

0 on success.

icv_crop()

int icv_crop	(	icv_image_t *	img,
		size_t	ulx,
		size_t	uly,
		size_t	urx,
		size_t	ury,
		size_t	lrx,
		size_t	lry,
		size_t	llx,
		size_t	lly,
		size_t	ynum,
		size_t	xnum
	)

This function crops an input image.

This can do a skewed cropping, i.e. given any four points of quadrilateral in an image, map it to a rectangle of xnumXynum dimension.

*        (ulx,uly)         (urx,ury)
*             __________________
*            /                 |
*           /                  |
*          /                   |
*         /                    |
*        /                     |
*       /______________________|
*     (llx,lly)             (lrx,lry)
* 

Returns

0 on success; on failure -1; and logs the error message.