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add new FX, binary threshold via otsu's method (issue #42)

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This commit is contained in:
c0ntrol
2016-03-29 20:38:23 +02:00
parent c24292e23b
commit 46fd8bff60
7 changed files with 187 additions and 3 deletions
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2
veejay-current/veejay-server/libvje/Makefile.am
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@@ -58,6 +58,6 @@ libvje_la_SOURCES = vj-effect.c vj-effman.c effects/common.c \
effects/alphaselect2.c effects/alphablend.c effects/porterduff.c effects/alphanegate.c effects/lumakeyalpha.c \
effects/chromamagickalpha.c effects/magicoverlaysalpha.c effects/gaussblur.c effects/levelcorrection.c \
effects/masktransition.c effects/alphadampen.c effects/passthrough.c effects/alphatransition.c effects/randnoise.c \
effects/bgsubtractgauss.c
effects/bgsubtractgauss.c effects/bwotsu.c

147
veejay-current/veejay-server/libvje/effects/bwotsu.c Normal file
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@@ -0,0 +1,147 @@
/*
* Linux VeeJay
*
* Copyright(C)2016 Niels Elburg <nwelburg@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License , or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
*/
#include <stdint.h>
#include <stdio.h>
#include <libvjmem/vjmem.h>
#include <math.h>
#include "bwotsu.h"
#include "common.h"
vj_effect *bwotsu_init(int w, int h)
{
vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
ve->num_params = 3;
ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params); /* default values */
ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* min */
ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* max */
ve->defaults[0] = 0;
ve->defaults[1] = 0xff;
ve->defaults[2] = 0;
ve->limits[0][0] = 0;
ve->limits[1][0] = 1;
ve->limits[0][1] = 0;
ve->limits[1][1] = 0xff;
ve->limits[0][2] = 0;
ve->limits[1][2] = 1;
ve->description = "Binary Threshold via Otsu's method";
ve->sub_format = -1;
ve->extra_frame = 0;
ve->has_user =0;
ve->parallel = 1;
ve->alpha = FLAG_ALPHA_OUT | FLAG_ALPHA_OPTIONAL;
ve->param_description = vje_build_param_list( ve->num_params, "To Alpha", "Skew", "Invert" );
return ve;
}
//@see https://en.wikipedia.org/wiki/Otsu's_method
static uint32_t bwotsu( uint32_t *H, const int N )
{
uint32_t threshold = 0;
double wF, wB=0.0, mB, mF, between, max = 0.0;
double sum = 0.0, sumB=0.0;
uint32_t i;
for( i = 0; i < 256; i++ )
{
wB += H[i];
if( wB == 0 )
continue;
wF = N - wB;
if( wF == 0 )
break;
sumB += ( i * H[i] );
mB = sumB / wB;
mF = (sum - sumB) / wF;
between = wB * wF * pow( mB - mF , 2 );
if( between > max ) {
max = between;
threshold = i;
}
}
return threshold;
}
void bwotsu_apply(VJFrame *frame, int mode, int skew, int invert)
{
uint32_t Histogram[256];
unsigned int i;
const int len = frame->len;
uint8_t *Y = frame->data[0];
uint8_t *A = frame->data[3];
veejay_memset( Histogram, 0, sizeof( Histogram ) );
if( skew != 0xff )
{
uint8_t Lookup[256];
__init_lookup_table( Lookup, 256, 0.0f, 255.0f, 0.0f, (float)skew );
for( i = 0; i < len; i ++ )
{
Histogram[ Lookup[ Y[i] ] ] += 1;
}
}
else
{
for( i = 0; i < len; i++ )
{
Histogram[ Y[i] ] += 1;
}
}
uint32_t threshold = bwotsu( Histogram, len );
uint8_t l = 0;
uint8_t h = 0xff;
if( invert ) {
l = 0xff;
h = 0;
}
switch( mode ) {
case 0:
for( i = 0; i < len; i ++ )
{
if( Y[i] < threshold )
Y[i] = l;
else
Y[i] = h;
}
veejay_memset( frame->data[1], 128, (frame->ssm ? frame->len : frame->uv_len) );
veejay_memset( frame->data[2], 128, (frame->ssm ? frame->len : frame->uv_len) );
break;
case 1:
for( i = 0; i < len; i ++ )
{
if( Y[i] < threshold )
A[i] = l;
else
A[i] = h;
}
break;
}
}

29
veejay-current/veejay-server/libvje/effects/bwotsu.h Normal file
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@@ -0,0 +1,29 @@
/*
* Linux VeeJay
*
* Copyright(C)2016 Niels Elburg <nwelburg@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License , or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
*/
#ifndef BWOTSU_H
#define BWOTSU_H
#include <libvje/vje.h>
#include <sys/types.h>
#include <stdint.h>
vj_effect *bwotsu_init();
void bwotsu_apply(VJFrame *frame, int mode, int skew, int invert );
#endif

5
veejay-current/veejay-server/libvje/internal.h
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@@ -26,7 +26,7 @@
#define VJE_SUCCESS 0
#include <libvje/vje.h>
#define VJ_IMAGE_EFFECT_MIN 94
#define VJ_IMAGE_EFFECT_MIN 93
#define VJ_IMAGE_EFFECT_MAX 199
#define VJ_VIDEO_EFFECT_MIN 200
@@ -252,6 +252,7 @@ enum {
VJ_IMAGE_EFFECT_ALPHADAMPEN = 96,
VJ_IMAGE_EFFECT_RANDNOISE = 95,
VJ_IMAGE_EFFECT_BGSUBTRACTGAUSS = 94,
VJ_IMAGE_EFFECT_BWOTSU = 93,
VJ_IMAGE_EFFECT_DUMMY=0,
};
@@ -460,6 +461,8 @@ int opacity);
extern void bwselect_apply(VJFrame *frame, int w, int h, int a , int b, int c, int g);
extern void bwotsu_apply(VJFrame *frame, int mode, int skew,int invert);
extern void complexinvert_apply(VJFrame *frame, int w, int h, int angle, int r, int g, int b, int i_noise);
extern void complexsaturation_apply(VJFrame *frame, int w, int h, int angle, int r, int g, int b, int adj, int adjv, int inoise);

2
veejay-current/veejay-server/libvje/vj-effect.c
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@@ -99,6 +99,7 @@
#include "effects/keyselect.h"
#include "effects/greyselect.h"
#include "effects/bwselect.h"
#include "effects/bwotsu.h"
#include "effects/complexinvert.h"
#include "effects/complexthreshold.h"
#include "effects/complexsaturate.h"
@@ -608,6 +609,7 @@ void vj_effect_initialize(int width, int height, int full_range)
vj_effects[VJ_IMAGE_EFFECT_DISTORTION] = distortion_init(width, height);
vj_effects[VJ_IMAGE_EFFECT_GREYSELECT] = greyselect_init(width,height);
vj_effects[VJ_IMAGE_EFFECT_BWSELECT] = bwselect_init(width,height);
vj_effects[VJ_IMAGE_EFFECT_BWOTSU] = bwotsu_init(width,height);
vj_effects[VJ_IMAGE_EFFECT_COMPLEXINVERT] = complexinvert_init(width,height);
vj_effects[VJ_IMAGE_EFFECT_COMPLEXSATURATE] = complexsaturation_init(width,height);
vj_effects[VJ_IMAGE_EFFECT_ISOLATE] = isolate_init(width,height);

3
veejay-current/veejay-server/libvje/vj-effman.c
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@@ -350,6 +350,9 @@ static void vj_effman_apply_image_effect(
case VJ_IMAGE_EFFECT_BWSELECT:
bwselect_apply(frames[0], frames[0]->width, frames[0]->height, arg[0], arg[1], arg[2], arg[3]);
break;
case VJ_IMAGE_EFFECT_BWOTSU:
bwotsu_apply( frames[0], arg[0],arg[1],arg[2] );
break;
case VJ_IMAGE_EFFECT_GREYSELECT:
greyselect_apply(frames[0], frames[0]->width, frames[0]->height,arg[0],arg[1],arg[2],arg[3],arg[4]);
break;

2
veejay-current/veejay-server/libvje/vje.h
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@@ -22,7 +22,7 @@
#define FX_LIMIT 1024
#define MAX_EFFECTS 165
#define MAX_EFFECTS 166
#define PARAM_WIDTH (1<<0x2)
#define PARAM_HEIGHT (1<<0x3)
#define PARAM_FADER (1<<0x1)