smallpix_reg.c File Reference

This is a regression test for scaling and rotation. The question to be answered is: in the quantization, where, if anywhere, do we add 0.5? The answer is that it should usually, but not always, be omitted. To see this, we operate on a very small pix and for visualization, scale up with replication to avoid aliasing and shifting. More...

#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"

Go to the source code of this file.

Functions
void	DisplayPix (PIXA **ppixa, l_int32 x, l_int32 y, char *fname)
	main (int argc, char **argv)

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Detailed Description

This is a regression test for scaling and rotation. The question to be answered is: in the quantization, where, if anywhere, do we add 0.5? The answer is that it should usually, but not always, be omitted. To see this, we operate on a very small pix and for visualization, scale up with replication to avoid aliasing and shifting.

Definition in file smallpix_reg.c.

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Function Documentation

void DisplayPix	(	PIXA **	ppixa,
		l_int32	x,
		l_int32	y,
		char *	fname
	)

Definition at line 43 of file smallpix_reg.c.

References IFF_PNG, pixaDestroy(), pixaDisplay(), pixDestroy(), pixDisplay(), and pixWrite().

Referenced by main().

main	(	int	argc,
		char **	argv
	)

Definition at line 56 of file smallpix_reg.c.

References DisplayPix(), generatePtaLineFromPt(), L_BRING_IN_BLACK, L_SET_PIXELS, NULL, pixaCreate(), pixCreate(), pixDestroy(), pixExpandReplicate(), pixPaintThroughMask(), pixRenderPta(), pixRotateAM(), pixRotateAMColorFast(), pixRotateAMCorner(), pixRotateBySampling(), pixSaveTiled(), pixScaleAreaMap(), pixScaleBySampling(), pixScaleColorLI(), pixScaleLI(), pixScaleSmooth(), ptaDestroy(), and ptaJoin().