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108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common functions for edge detection
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*/
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#ifndef AVFILTER_EDGE_COMMON_H
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#define AVFILTER_EDGE_COMMON_H
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#include "avfilter.h"
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/**
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* @brief Rounded directions used in av_image_sobel()
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*/
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enum AVRoundedDirection {
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DIRECTION_45UP,
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DIRECTION_45DOWN,
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DIRECTION_HORIZONTAL,
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DIRECTION_VERTICAL,
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};
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/**
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* Simple sobel operator to get rounded gradients
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to magnitude image
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* @param dst_linesize linesizes for the magnitude image
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* @param dir data pointers to direction image
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* @param dir_linesize linesizes for the direction image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_sobel(int w, int h,
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uint16_t *dst, int dst_linesize,
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int8_t *dir, int dir_linesize,
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const uint8_t *src, int src_linesize);
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/**
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* Filters rounded gradients to drop all non-maxima pixels in the magnitude image
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* Expects gradients generated by av_image_sobel()
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* Expects zero's in the destination buffer dst
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to magnitude image
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* @param dst_linesize linesizes for the magnitude image
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* @param dir data pointers to direction image
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* @param dir_linesize linesizes for the direction image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_non_maximum_suppression(int w, int h,
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uint8_t *dst, int dst_linesize,
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const int8_t *dir, int dir_linesize,
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const uint16_t *src, int src_linesize);
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/**
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* Filters all pixels in src to keep all pixels > high,
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* and keep all pixels > low where all surrounding pixels > high
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*
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* @param low the low threshold value
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* @param high the hegh threshold value
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to destination image
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* @param dst_linesize linesizes for the destination image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_double_threshold(int low, int high, int w, int h,
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uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize);
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/**
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* Applies gaussian blur.
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* 5x5 kernels, sigma = 1.4
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to destination image
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* @param dst_linesize linesizes for the destination image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_gaussian_blur(int w, int h,
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uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize);
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#endif
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