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im_contrast_surface
Langue: en
Version: 158180 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
im_contrast_surface, im_contrast_surface_raw - Generate contrast surface
SYNOPSIS
#include <vips/vips.h> int im_contrast_surface( IMAGE *in, IMAGE *out, int half_win_size, int spacing );
int im_contrast_surface_raw( IMAGE *in, IMAGE *out, int half_win_size, int spacing );
DESCRIPTION
These functions generate an image where the value of each pixel represents the contrast within a square window of size 2 * half_win_size + 1 centred on the corresponsing point in the input image.The output is sub-sampled by a factor of spacing.
Input must be single-band uncoded uchar, WIO or PIO.
Output is single-band uncoded uint, WIO or PIO.
In im_contrast_surface(3), pixels beyond the edges of the input image are considered to be have the value of the nearest pixel which is in the image.
Alternatively, in im_contrast_surface_raw(3), pixels within half_win_size of the edge are not calculated, and output is smaller accordingly.
RETURN VALUE
The functions returns 0 on success and -1 on error.COPYRIGHT
Copyright 2006, The Nottingham Trent University.
AUTHOR
Tom VajzovicContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre