1 /*****************************************************************************
2 * gradient.c : Gradient and edge detection video effects plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2008 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Antoine Cellerier <dionoea -at- videolan -dot- org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <math.h> /* sin(), cos() */
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
39 #include <vlc_filter.h>
40 #include "filter_picture.h"
42 enum { GRADIENT, EDGE, HOUGH };
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Create ( vlc_object_t * );
48 static void Destroy ( vlc_object_t * );
50 static picture_t *Filter( filter_t *, picture_t * );
51 static int GradientCallback( vlc_object_t *, char const *,
52 vlc_value_t, vlc_value_t,
55 static void FilterGradient( filter_t *, picture_t *, picture_t * );
56 static void FilterEdge ( filter_t *, picture_t *, picture_t * );
57 static void FilterHough ( filter_t *, picture_t *, picture_t * );
59 /*****************************************************************************
61 *****************************************************************************/
62 #define MODE_TEXT N_("Distort mode")
63 #define MODE_LONGTEXT N_("Distort mode, one of \"gradient\", \"edge\" and \"hough\".")
65 #define GRADIENT_TEXT N_("Gradient image type")
66 #define GRADIENT_LONGTEXT N_("Gradient image type (0 or 1). 0 will " \
67 "turn the image to white while 1 will keep colors." )
69 #define CARTOON_TEXT N_("Apply cartoon effect")
70 #define CARTOON_LONGTEXT N_("Apply cartoon effect. It is only used by " \
71 "\"gradient\" and \"edge\".")
73 #define GRADIENT_HELP N_("Apply color gradient or edge detection effects")
75 static const char *const mode_list[] = { "gradient", "edge", "hough" };
76 static const char *const mode_list_text[] = { N_("Gradient"), N_("Edge"), N_("Hough") };
78 #define FILTER_PREFIX "gradient-"
81 set_description( N_("Gradient video filter") )
82 set_shortname( N_( "Gradient" ))
83 set_help(GRADIENT_HELP)
84 set_capability( "video filter2", 0 )
85 set_category( CAT_VIDEO )
86 set_subcategory( SUBCAT_VIDEO_VFILTER )
88 add_string( FILTER_PREFIX "mode", "gradient", NULL,
89 MODE_TEXT, MODE_LONGTEXT, false )
90 change_string_list( mode_list, mode_list_text, 0 )
92 add_integer_with_range( FILTER_PREFIX "type", 0, 0, 1, NULL,
93 GRADIENT_TEXT, GRADIENT_LONGTEXT, false )
94 add_bool( FILTER_PREFIX "cartoon", true, NULL,
95 CARTOON_TEXT, CARTOON_LONGTEXT, false )
97 add_shortcut( "gradient" )
98 set_callbacks( Create, Destroy )
101 static const char *const ppsz_filter_options[] = {
102 "mode", "type", "cartoon", NULL
105 /*****************************************************************************
106 * filter_sys_t: Distort video output method descriptor
107 *****************************************************************************
108 * This structure is part of the video output thread descriptor.
109 * It describes the Distort specific properties of an output thread.
110 *****************************************************************************/
116 /* For the gradient mode */
121 uint32_t *p_buf32_bis;
128 /*****************************************************************************
129 * Create: allocates Distort video thread output method
130 *****************************************************************************
131 * This function allocates and initializes a Distort vout method.
132 *****************************************************************************/
133 static int Create( vlc_object_t *p_this )
135 filter_t *p_filter = (filter_t *)p_this;
138 switch( p_filter->fmt_in.video.i_chroma )
144 msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
145 (char*)&(p_filter->fmt_in.video.i_chroma) );
149 /* Allocate structure */
150 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
151 if( p_filter->p_sys == NULL )
154 p_filter->pf_video_filter = Filter;
156 p_filter->p_sys->p_pre_hough = NULL;
158 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
162 var_CreateGetNonEmptyStringCommand( p_filter, FILTER_PREFIX "mode" )) )
164 msg_Err( p_filter, "configuration variable "
165 FILTER_PREFIX "mode empty" );
166 p_filter->p_sys->i_mode = GRADIENT;
170 if( !strcmp( psz_method, "gradient" ) )
172 p_filter->p_sys->i_mode = GRADIENT;
174 else if( !strcmp( psz_method, "edge" ) )
176 p_filter->p_sys->i_mode = EDGE;
178 else if( !strcmp( psz_method, "hough" ) )
180 p_filter->p_sys->i_mode = HOUGH;
184 msg_Err( p_filter, "no valid gradient mode provided (%s)", psz_method );
185 p_filter->p_sys->i_mode = GRADIENT;
190 p_filter->p_sys->i_gradient_type =
191 var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "type" );
192 p_filter->p_sys->b_cartoon =
193 var_CreateGetBoolCommand( p_filter, FILTER_PREFIX "cartoon" );
195 vlc_mutex_init( &p_filter->p_sys->lock );
196 var_AddCallback( p_filter, FILTER_PREFIX "mode",
197 GradientCallback, p_filter->p_sys );
198 var_AddCallback( p_filter, FILTER_PREFIX "type",
199 GradientCallback, p_filter->p_sys );
200 var_AddCallback( p_filter, FILTER_PREFIX "cartoon",
201 GradientCallback, p_filter->p_sys );
203 p_filter->p_sys->p_buf32 = NULL;
204 p_filter->p_sys->p_buf32_bis = NULL;
205 p_filter->p_sys->p_buf8 = NULL;
210 /*****************************************************************************
211 * Destroy: destroy Distort video thread output method
212 *****************************************************************************
213 * Terminate an output method created by DistortCreateOutputMethod
214 *****************************************************************************/
215 static void Destroy( vlc_object_t *p_this )
217 filter_t *p_filter = (filter_t *)p_this;
218 filter_sys_t *p_sys = p_filter->p_sys;
220 var_DelCallback( p_filter, FILTER_PREFIX "mode",
221 GradientCallback, p_sys );
222 var_DelCallback( p_filter, FILTER_PREFIX "type",
223 GradientCallback, p_sys );
224 var_DelCallback( p_filter, FILTER_PREFIX "cartoon",
225 GradientCallback, p_sys );
226 vlc_mutex_destroy( &p_sys->lock );
228 free( p_sys->p_buf32 );
229 free( p_sys->p_buf32_bis );
230 free( p_sys->p_buf8 );
231 free( p_sys->p_pre_hough );
236 /*****************************************************************************
237 * Render: displays previously rendered output
238 *****************************************************************************
239 * This function send the currently rendered image to Distort image, waits
240 * until it is displayed and switch the two rendering buffers, preparing next
242 *****************************************************************************/
243 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
247 if( !p_pic ) return NULL;
249 p_outpic = filter_NewPicture( p_filter );
252 picture_Release( p_pic );
256 vlc_mutex_lock( &p_filter->p_sys->lock );
257 switch( p_filter->p_sys->i_mode )
260 FilterEdge( p_filter, p_pic, p_outpic );
264 FilterGradient( p_filter, p_pic, p_outpic );
268 FilterHough( p_filter, p_pic, p_outpic );
274 vlc_mutex_unlock( &p_filter->p_sys->lock );
276 return CopyInfoAndRelease( p_outpic, p_pic );
279 /*****************************************************************************
280 * Gaussian Convolution
281 *****************************************************************************
282 * Gaussian convolution ( sigma == 1.4 )
284 * | 2 4 5 4 2 | | 2 4 4 4 2 |
285 * | 4 9 12 9 4 | | 4 8 12 8 4 |
286 * | 5 12 15 12 5 | ~ | 4 12 16 12 4 |
287 * | 4 9 12 9 4 | | 4 8 12 8 4 |
288 * | 2 4 5 4 2 | | 2 4 4 4 2 |
289 *****************************************************************************/
290 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
292 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
293 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
294 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
295 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
298 for( y = 2; y < i_num_lines - 2; y++ )
300 for( x = 2; x < i_src_visible - 2; x++ )
302 p_smooth[y*i_src_visible+x] = (uint32_t)(
304 ( p_inpix[(y-2)*i_src_pitch+x-2] )
305 + ((p_inpix[(y-2)*i_src_pitch+x-1]
306 + p_inpix[(y-2)*i_src_pitch+x]
307 + p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
308 + ( p_inpix[(y-2)*i_src_pitch+x+2] )
310 + ((p_inpix[(y-1)*i_src_pitch+x-2]
311 + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
312 + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
313 + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
314 + p_inpix[(y-1)*i_src_pitch+x+2]
316 + p_inpix[y*i_src_pitch+x-2]
317 + ( p_inpix[y*i_src_pitch+x-1]*3 )
318 + ( p_inpix[y*i_src_pitch+x]<<2 )
319 + ( p_inpix[y*i_src_pitch+x+1]*3 )
320 + p_inpix[y*i_src_pitch+x+2]
322 + p_inpix[(y+1)*i_src_pitch+x-2]
323 + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
324 + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
325 + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
326 + p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
328 + ( p_inpix[(y+2)*i_src_pitch+x-2] )
329 + ((p_inpix[(y+2)*i_src_pitch+x-1]
330 + p_inpix[(y+2)*i_src_pitch+x]
331 + p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
332 + ( p_inpix[(y+2)*i_src_pitch+x+2] )
338 /*****************************************************************************
339 * FilterGradient: Sobel
340 *****************************************************************************/
341 static void FilterGradient( filter_t *p_filter, picture_t *p_inpic,
342 picture_t *p_outpic )
345 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
346 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
347 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
348 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
350 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
351 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
354 if( !p_filter->p_sys->p_buf32 )
355 p_filter->p_sys->p_buf32 =
356 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
357 p_smooth = p_filter->p_sys->p_buf32;
359 if( !p_smooth ) return;
361 if( p_filter->p_sys->b_cartoon )
363 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
364 p_inpic->p[U_PLANE].p_pixels,
365 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
366 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
367 p_inpic->p[V_PLANE].p_pixels,
368 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
372 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
373 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
374 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
375 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
378 GaussianConvolution( p_inpic, p_smooth );
383 | -2 0 2 | and | 0 0 0 |
384 | -1 0 1 | | -1 -2 -1 | */
387 for( y = 1; y < i_num_lines - 1; y++ ) \
389 for( x = 1; x < i_src_visible - 1; x++ ) \
394 ( p_smooth[(y-1)*i_src_visible+x-1] \
395 - p_smooth[(y+1)*i_src_visible+x-1] ) \
396 + ( ( p_smooth[(y-1)*i_src_visible+x] \
397 - p_smooth[(y+1)*i_src_visible+x] ) <<1 ) \
398 + ( p_smooth[(y-1)*i_src_visible+x+1] \
399 - p_smooth[(y+1)*i_src_visible+x+1] ) \
403 ( p_smooth[(y-1)*i_src_visible+x-1] \
404 - p_smooth[(y-1)*i_src_visible+x+1] ) \
405 + ( ( p_smooth[y*i_src_visible+x-1] \
406 - p_smooth[y*i_src_visible+x+1] ) <<1 ) \
407 + ( p_smooth[(y+1)*i_src_visible+x-1] \
408 - p_smooth[(y+1)*i_src_visible+x+1] ) \
411 if( p_filter->p_sys->i_gradient_type )
413 if( p_filter->p_sys->b_cartoon )
418 p_outpix[y*i_dst_pitch+x] = 0x00;
422 if( p_smooth[y*i_src_visible+x] > 0xa0 )
423 p_outpix[y*i_dst_pitch+x] =
424 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
425 else if( p_smooth[y*i_src_visible+x] > 0x70 )
426 p_outpix[y*i_dst_pitch+x] =
427 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
428 else if( p_smooth[y*i_src_visible+x] > 0x28 )
429 p_outpix[y*i_dst_pitch+x] =
430 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
432 p_outpix[y*i_dst_pitch+x] =
433 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
440 p_outpix[y*i_dst_pitch+x] = clip_uint8_vlc( a );
448 p_outpix[y*i_dst_pitch+x] = 0;
450 p_outpix[y*i_dst_pitch+x] = 0xff-(uint8_t)a;
456 /*****************************************************************************
457 * FilterEdge: Canny edge detection algorithm
458 *****************************************************************************
459 * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
460 * (well ... my implementation isn't really the canny algorithm ... but some
461 * ideas are the same)
462 *****************************************************************************/
471 static void FilterEdge( filter_t *p_filter, picture_t *p_inpic,
472 picture_t *p_outpic )
476 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
477 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
478 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
479 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
481 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
482 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
488 if( !p_filter->p_sys->p_buf32 )
489 p_filter->p_sys->p_buf32 =
490 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
491 p_smooth = p_filter->p_sys->p_buf32;
493 if( !p_filter->p_sys->p_buf32_bis )
494 p_filter->p_sys->p_buf32_bis =
495 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
496 p_grad = p_filter->p_sys->p_buf32_bis;
498 if( !p_filter->p_sys->p_buf8 )
499 p_filter->p_sys->p_buf8 =
500 (uint8_t *)malloc( i_num_lines * i_src_visible * sizeof(uint8_t));
501 p_theta = p_filter->p_sys->p_buf8;
503 if( !p_smooth || !p_grad || !p_theta ) return;
505 if( p_filter->p_sys->b_cartoon )
507 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
508 p_inpic->p[U_PLANE].p_pixels,
509 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
510 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
511 p_inpic->p[V_PLANE].p_pixels,
512 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
516 vlc_memset( p_outpic->p[Y_PLANE].p_pixels, 0xff,
517 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
518 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
519 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
520 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
521 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
524 GaussianConvolution( p_inpic, p_smooth );
529 | -2 0 2 | and | 0 0 0 |
530 | -1 0 1 | | -1 -2 -1 | */
532 for( y = 1; y < i_num_lines - 1; y++ )
534 for( x = 1; x < i_src_visible - 1; x++ )
538 ( p_smooth[(y-1)*i_src_visible+x-1]
539 - p_smooth[(y+1)*i_src_visible+x-1] )
540 + ( ( p_smooth[(y-1)*i_src_visible+x]
541 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
542 + ( p_smooth[(y-1)*i_src_visible+x+1]
543 - p_smooth[(y+1)*i_src_visible+x+1] );
545 ( p_smooth[(y-1)*i_src_visible+x-1]
546 - p_smooth[(y-1)*i_src_visible+x+1] )
547 + ( ( p_smooth[y*i_src_visible+x-1]
548 - p_smooth[y*i_src_visible+x+1] ) <<1 )
549 + ( p_smooth[(y+1)*i_src_visible+x-1]
550 - p_smooth[(y+1)*i_src_visible+x+1] );
552 p_grad[y*i_src_visible+x] = (uint32_t)(abs( gradx ) + abs( grady ));
554 /* tan( 22.5 ) = 0,414213562 .. * 128 = 53
555 * tan( 26,565051177 ) = 0.5
556 * tan( 45 + 22.5 ) = 2,414213562 .. * 128 = 309
557 * tan( 63,434948823 ) 2 */
558 if( (grady<<1) > gradx )
559 p_theta[y*i_src_visible+x] = THETA_P;
560 else if( (grady<<1) < -gradx )
561 p_theta[y*i_src_visible+x] = THETA_M;
562 else if( !gradx || abs(grady) > abs(gradx)<<1 )
563 p_theta[y*i_src_visible+x] = THETA_Y;
565 p_theta[y*i_src_visible+x] = THETA_X;
570 for( y = 1; y < i_num_lines - 1; y++ )
572 for( x = 1; x < i_src_visible - 1; x++ )
574 if( p_grad[y*i_src_visible+x] > 40 )
576 switch( p_theta[y*i_src_visible+x] )
579 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x]
580 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x] )
582 p_outpix[y*i_dst_pitch+x] = 0;
584 } else goto colorize;
586 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x-1]
587 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x+1] )
589 p_outpix[y*i_dst_pitch+x] = 0;
591 } else goto colorize;
593 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x+1]
594 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x-1] )
596 p_outpix[y*i_dst_pitch+x] = 0;
598 } else goto colorize;
600 if( p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x-1]
601 && p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x+1] )
603 p_outpix[y*i_dst_pitch+x] = 0;
605 } else goto colorize;
611 if( p_filter->p_sys->b_cartoon )
613 if( p_smooth[y*i_src_visible+x] > 0xa0 )
614 p_outpix[y*i_dst_pitch+x] = (uint8_t)
615 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
616 else if( p_smooth[y*i_src_visible+x] > 0x70 )
617 p_outpix[y*i_dst_pitch+x] =(uint8_t)
618 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
619 else if( p_smooth[y*i_src_visible+x] > 0x28 )
620 p_outpix[y*i_dst_pitch+x] =(uint8_t)
621 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
623 p_outpix[y*i_dst_pitch+x] =(uint8_t)
624 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
631 /*****************************************************************************
633 *****************************************************************************/
634 #define p_pre_hough p_filter->p_sys->p_pre_hough
635 static void FilterHough( filter_t *p_filter, picture_t *p_inpic,
636 picture_t *p_outpic )
639 int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
640 int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
641 int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
643 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
645 int i_diag = sqrt( i_num_lines * i_num_lines +
646 i_src_visible * i_src_visible);
647 int i_max, i_phi_max, i_rho, i_rho_max;
649 double d_step = M_PI / i_nb_steps;
654 int *p_hough = malloc( i_diag * i_nb_steps * sizeof(int) );
655 if( ! p_hough ) return;
657 p_smooth = (uint32_t *)malloc( i_num_lines*i_src_visible*sizeof(uint32_t));
666 msg_Dbg(p_filter, "Starting precalculation");
667 p_pre_hough = malloc( i_num_lines*i_src_visible*i_nb_steps*sizeof(int));
674 for( i = 0 ; i < i_nb_steps ; i++)
676 d_sin = sin(d_step * i);
677 d_cos = cos(d_step * i);
678 for( y = 0 ; y < i_num_lines ; y++ )
679 for( x = 0 ; x < i_src_visible ; x++ )
681 p_pre_hough[(i*i_num_lines+y)*i_src_visible + x] =
682 ceil(x*d_sin + y*d_cos);
685 msg_Dbg(p_filter, "Precalculation done");
688 vlc_memset( p_hough, 0, i_diag * i_nb_steps * sizeof(int) );
691 p_outpic->p[Y_PLANE].p_pixels, p_inpic->p[Y_PLANE].p_pixels,
692 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
694 p_outpic->p[U_PLANE].p_pixels, p_inpic->p[U_PLANE].p_pixels,
695 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
697 p_outpic->p[V_PLANE].p_pixels, p_inpic->p[V_PLANE].p_pixels,
698 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
700 GaussianConvolution( p_inpic, p_smooth );
705 | -2 0 2 | and | 0 0 0 |
706 | -1 0 1 | | -1 -2 -1 | */
711 for( y = 4; y < i_num_lines - 4; y++ )
713 for( x = 4; x < i_src_visible - 4; x++ )
718 ( ( p_smooth[(y-1)*i_src_visible+x]
719 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
720 + ( p_smooth[(y-1)*i_src_visible+x-1]
721 - p_smooth[(y+1)*i_src_visible+x-1] )
722 + ( p_smooth[(y-1)*i_src_visible+x+1]
723 - p_smooth[(y+1)*i_src_visible+x+1] )
727 ( ( p_smooth[y*i_src_visible+x-1]
728 - p_smooth[y*i_src_visible+x+1] ) <<1 )
729 + ( p_smooth[(y-1)*i_src_visible+x-1]
730 - p_smooth[(y-1)*i_src_visible+x+1] )
731 + ( p_smooth[(y+1)*i_src_visible+x-1]
732 - p_smooth[(y+1)*i_src_visible+x+1] )
737 for( i = 0 ; i < i_nb_steps ; i ++ )
739 i_rho = p_pre_hough[(i*i_num_lines+y)*i_src_visible + x];
740 if( p_hough[i_rho + i_diag/2 + i * i_diag]++ > i_max )
742 i_max = p_hough[i_rho + i_diag/2 + i * i_diag];
751 d_sin = sin(i_phi_max*d_step);
752 d_cos = cos(i_phi_max*d_step);
755 for( x = 0 ; x < i_src_visible ; x++ )
757 y = (i_rho_max - x * d_sin) / d_cos;
758 if( y >= 0 && y < i_num_lines )
759 p_outpix[y*i_dst_pitch+x] = 255;
769 static int GradientCallback( vlc_object_t *p_this, char const *psz_var,
770 vlc_value_t oldval, vlc_value_t newval,
774 filter_sys_t *p_sys = (filter_sys_t *)p_data;
776 vlc_mutex_lock( &p_sys->lock );
777 if( !strcmp( psz_var, FILTER_PREFIX "mode" ) )
779 if( !strcmp( newval.psz_string, "gradient" ) )
781 p_sys->i_mode = GRADIENT;
783 else if( !strcmp( newval.psz_string, "edge" ) )
785 p_sys->i_mode = EDGE;
787 else if( !strcmp( newval.psz_string, "hough" ) )
789 p_sys->i_mode = HOUGH;
793 msg_Err( p_this, "no valid gradient mode provided (%s)", newval.psz_string );
794 p_sys->i_mode = GRADIENT;
797 else if( !strcmp( psz_var, FILTER_PREFIX "type" ) )
799 p_sys->i_gradient_type = newval.i_int;
801 else if( !strcmp( psz_var, FILTER_PREFIX "cartoon" ) )
803 p_sys->b_cartoon = newval.b_bool;
805 vlc_mutex_unlock( &p_sys->lock );