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>
40 #include "vlc_filter.h"
41 #include "filter_picture.h"
43 enum { GRADIENT, EDGE, HOUGH };
45 /*****************************************************************************
47 *****************************************************************************/
48 static int Create ( vlc_object_t * );
49 static void Destroy ( vlc_object_t * );
51 static picture_t *Filter( filter_t *, picture_t * );
52 static int GradientCallback( vlc_object_t *, char const *,
53 vlc_value_t, vlc_value_t,
56 static void FilterGradient( filter_t *, picture_t *, picture_t * );
57 static void FilterEdge ( filter_t *, picture_t *, picture_t * );
58 static void FilterHough ( filter_t *, picture_t *, picture_t * );
60 /*****************************************************************************
62 *****************************************************************************/
63 #define MODE_TEXT N_("Distort mode")
64 #define MODE_LONGTEXT N_("Distort mode, one of \"gradient\", \"edge\" and \"hough\".")
66 #define GRADIENT_TEXT N_("Gradient image type")
67 #define GRADIENT_LONGTEXT N_("Gradient image type (0 or 1). 0 will " \
68 "turn the image to white while 1 will keep colors." )
70 #define CARTOON_TEXT N_("Apply cartoon effect")
71 #define CARTOON_LONGTEXT N_("Apply cartoon effect. It is only used by " \
72 "\"gradient\" and \"edge\".")
74 static const char *const mode_list[] = { "gradient", "edge", "hough" };
75 static const char *const mode_list_text[] = { N_("Gradient"), N_("Edge"), N_("Hough") };
77 #define FILTER_PREFIX "gradient-"
80 set_description( N_("Gradient video filter") );
81 set_shortname( N_( "Gradient" ));
82 set_capability( "video filter2", 0 );
83 set_category( CAT_VIDEO );
84 set_subcategory( SUBCAT_VIDEO_VFILTER );
86 add_string( FILTER_PREFIX "mode", "gradient", NULL,
87 MODE_TEXT, MODE_LONGTEXT, false );
88 change_string_list( mode_list, mode_list_text, 0 );
90 add_integer_with_range( FILTER_PREFIX "type", 0, 0, 1, NULL,
91 GRADIENT_TEXT, GRADIENT_LONGTEXT, false );
92 add_bool( FILTER_PREFIX "cartoon", 1, NULL,
93 CARTOON_TEXT, CARTOON_LONGTEXT, false );
95 add_shortcut( "gradient" );
96 set_callbacks( Create, Destroy );
99 static const char *const ppsz_filter_options[] = {
100 "mode", "type", "cartoon", NULL
103 /*****************************************************************************
104 * vout_sys_t: Distort video output method descriptor
105 *****************************************************************************
106 * This structure is part of the video output thread descriptor.
107 * It describes the Distort specific properties of an output thread.
108 *****************************************************************************/
113 /* For the gradient mode */
118 uint32_t *p_buf32_bis;
125 /*****************************************************************************
126 * Create: allocates Distort video thread output method
127 *****************************************************************************
128 * This function allocates and initializes a Distort vout method.
129 *****************************************************************************/
130 static int Create( vlc_object_t *p_this )
132 filter_t *p_filter = (filter_t *)p_this;
135 switch( p_filter->fmt_in.video.i_chroma )
141 msg_Err( p_filter, "Unsupported input chroma (%4s)",
142 (char*)&(p_filter->fmt_in.video.i_chroma) );
146 /* Allocate structure */
147 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
148 if( p_filter->p_sys == NULL )
151 p_filter->pf_video_filter = Filter;
153 p_filter->p_sys->p_pre_hough = NULL;
155 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
159 var_CreateGetNonEmptyStringCommand( p_filter, FILTER_PREFIX "mode" )) )
161 msg_Err( p_filter, "configuration variable "
162 FILTER_PREFIX "mode empty" );
163 p_filter->p_sys->i_mode = GRADIENT;
167 if( !strcmp( psz_method, "gradient" ) )
169 p_filter->p_sys->i_mode = GRADIENT;
171 else if( !strcmp( psz_method, "edge" ) )
173 p_filter->p_sys->i_mode = EDGE;
175 else if( !strcmp( psz_method, "hough" ) )
177 p_filter->p_sys->i_mode = HOUGH;
181 msg_Err( p_filter, "no valid gradient mode provided (%s)", psz_method );
182 p_filter->p_sys->i_mode = GRADIENT;
187 p_filter->p_sys->i_gradient_type =
188 var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "type" );
189 p_filter->p_sys->b_cartoon =
190 var_CreateGetBoolCommand( p_filter, FILTER_PREFIX "cartoon" );
192 var_AddCallback( p_filter, FILTER_PREFIX "mode",
193 GradientCallback, p_filter->p_sys );
194 var_AddCallback( p_filter, FILTER_PREFIX "type",
195 GradientCallback, p_filter->p_sys );
196 var_AddCallback( p_filter, FILTER_PREFIX "cartoon",
197 GradientCallback, p_filter->p_sys );
199 p_filter->p_sys->p_buf32 = NULL;
200 p_filter->p_sys->p_buf32_bis = NULL;
201 p_filter->p_sys->p_buf8 = NULL;
206 /*****************************************************************************
207 * Destroy: destroy Distort video thread output method
208 *****************************************************************************
209 * Terminate an output method created by DistortCreateOutputMethod
210 *****************************************************************************/
211 static void Destroy( vlc_object_t *p_this )
213 filter_t *p_filter = (filter_t *)p_this;
215 free( p_filter->p_sys->p_buf32 );
216 free( p_filter->p_sys->p_buf32_bis );
217 free( p_filter->p_sys->p_buf8 );
218 free( p_filter->p_sys->p_pre_hough );
220 free( p_filter->p_sys );
223 /*****************************************************************************
224 * Render: displays previously rendered output
225 *****************************************************************************
226 * This function send the currently rendered image to Distort image, waits
227 * until it is displayed and switch the two rendering buffers, preparing next
229 *****************************************************************************/
230 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
234 if( !p_pic ) return NULL;
236 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
239 msg_Warn( p_filter, "can't get output picture" );
240 picture_Release( p_pic );
244 switch( p_filter->p_sys->i_mode )
247 FilterEdge( p_filter, p_pic, p_outpic );
251 FilterGradient( p_filter, p_pic, p_outpic );
255 FilterHough( p_filter, p_pic, p_outpic );
262 return CopyInfoAndRelease( p_outpic, p_pic );
265 /*****************************************************************************
266 * Gaussian Convolution
267 *****************************************************************************
268 * Gaussian convolution ( sigma == 1.4 )
270 * | 2 4 5 4 2 | | 2 4 4 4 2 |
271 * | 4 9 12 9 4 | | 4 8 12 8 4 |
272 * | 5 12 15 12 5 | ~ | 4 12 16 12 4 |
273 * | 4 9 12 9 4 | | 4 8 12 8 4 |
274 * | 2 4 5 4 2 | | 2 4 4 4 2 |
275 *****************************************************************************/
276 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
278 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
279 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
280 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
281 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
284 for( y = 2; y < i_num_lines - 2; y++ )
286 for( x = 2; x < i_src_visible - 2; x++ )
288 p_smooth[y*i_src_visible+x] = (uint32_t)(
290 ( p_inpix[(y-2)*i_src_pitch+x-2] )
291 + ((p_inpix[(y-2)*i_src_pitch+x-1]
292 + p_inpix[(y-2)*i_src_pitch+x]
293 + p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
294 + ( p_inpix[(y-2)*i_src_pitch+x+2] )
296 + ((p_inpix[(y-1)*i_src_pitch+x-2]
297 + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
298 + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
299 + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
300 + p_inpix[(y-1)*i_src_pitch+x+2]
302 + p_inpix[y*i_src_pitch+x-2]
303 + ( p_inpix[y*i_src_pitch+x-1]*3 )
304 + ( p_inpix[y*i_src_pitch+x]<<2 )
305 + ( p_inpix[y*i_src_pitch+x+1]*3 )
306 + p_inpix[y*i_src_pitch+x+2]
308 + p_inpix[(y+1)*i_src_pitch+x-2]
309 + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
310 + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
311 + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
312 + p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
314 + ( p_inpix[(y+2)*i_src_pitch+x-2] )
315 + ((p_inpix[(y+2)*i_src_pitch+x-1]
316 + p_inpix[(y+2)*i_src_pitch+x]
317 + p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
318 + ( p_inpix[(y+2)*i_src_pitch+x+2] )
324 /*****************************************************************************
325 * FilterGradient: Sobel
326 *****************************************************************************/
327 static void FilterGradient( filter_t *p_filter, picture_t *p_inpic,
328 picture_t *p_outpic )
331 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
332 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
333 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
334 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
336 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
337 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
340 if( !p_filter->p_sys->p_buf32 )
341 p_filter->p_sys->p_buf32 =
342 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
343 p_smooth = p_filter->p_sys->p_buf32;
345 if( !p_smooth ) return;
347 if( p_filter->p_sys->b_cartoon )
349 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
350 p_inpic->p[U_PLANE].p_pixels,
351 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
352 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
353 p_inpic->p[V_PLANE].p_pixels,
354 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
358 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
359 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
360 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
361 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
364 GaussianConvolution( p_inpic, p_smooth );
369 | -2 0 2 | and | 0 0 0 |
370 | -1 0 1 | | -1 -2 -1 | */
373 for( y = 1; y < i_num_lines - 1; y++ ) \
375 for( x = 1; x < i_src_visible - 1; x++ ) \
380 ( p_smooth[(y-1)*i_src_visible+x-1] \
381 - p_smooth[(y+1)*i_src_visible+x-1] ) \
382 + ( ( p_smooth[(y-1)*i_src_visible+x] \
383 - p_smooth[(y+1)*i_src_visible+x] ) <<1 ) \
384 + ( p_smooth[(y-1)*i_src_visible+x+1] \
385 - p_smooth[(y+1)*i_src_visible+x+1] ) \
389 ( p_smooth[(y-1)*i_src_visible+x-1] \
390 - p_smooth[(y-1)*i_src_visible+x+1] ) \
391 + ( ( p_smooth[y*i_src_visible+x-1] \
392 - p_smooth[y*i_src_visible+x+1] ) <<1 ) \
393 + ( p_smooth[(y+1)*i_src_visible+x-1] \
394 - p_smooth[(y+1)*i_src_visible+x+1] ) \
397 if( p_filter->p_sys->i_gradient_type )
399 if( p_filter->p_sys->b_cartoon )
404 p_outpix[y*i_dst_pitch+x] = 0x00;
408 if( p_smooth[y*i_src_visible+x] > 0xa0 )
409 p_outpix[y*i_dst_pitch+x] =
410 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
411 else if( p_smooth[y*i_src_visible+x] > 0x70 )
412 p_outpix[y*i_dst_pitch+x] =
413 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
414 else if( p_smooth[y*i_src_visible+x] > 0x28 )
415 p_outpix[y*i_dst_pitch+x] =
416 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
418 p_outpix[y*i_dst_pitch+x] =
419 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
426 p_outpix[y*i_dst_pitch+x] = clip_uint8_vlc( a );
434 p_outpix[y*i_dst_pitch+x] = 0;
436 p_outpix[y*i_dst_pitch+x] = 0xff-(uint8_t)a;
442 /*****************************************************************************
443 * FilterEdge: Canny edge detection algorithm
444 *****************************************************************************
445 * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
446 * (well ... my implementation isn't really the canny algorithm ... but some
447 * ideas are the same)
448 *****************************************************************************/
457 static void FilterEdge( filter_t *p_filter, picture_t *p_inpic,
458 picture_t *p_outpic )
462 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
463 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
464 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
465 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
467 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
468 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
474 if( !p_filter->p_sys->p_buf32 )
475 p_filter->p_sys->p_buf32 =
476 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
477 p_smooth = p_filter->p_sys->p_buf32;
479 if( !p_filter->p_sys->p_buf32_bis )
480 p_filter->p_sys->p_buf32_bis =
481 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
482 p_grad = p_filter->p_sys->p_buf32_bis;
484 if( !p_filter->p_sys->p_buf8 )
485 p_filter->p_sys->p_buf8 =
486 (uint8_t *)malloc( i_num_lines * i_src_visible * sizeof(uint8_t));
487 p_theta = p_filter->p_sys->p_buf8;
489 if( !p_smooth || !p_grad || !p_theta ) return;
491 if( p_filter->p_sys->b_cartoon )
493 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
494 p_inpic->p[U_PLANE].p_pixels,
495 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
496 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
497 p_inpic->p[V_PLANE].p_pixels,
498 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
502 vlc_memset( p_outpic->p[Y_PLANE].p_pixels, 0xff,
503 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
504 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
505 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
506 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
507 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
510 GaussianConvolution( p_inpic, p_smooth );
515 | -2 0 2 | and | 0 0 0 |
516 | -1 0 1 | | -1 -2 -1 | */
518 for( y = 1; y < i_num_lines - 1; y++ )
520 for( x = 1; x < i_src_visible - 1; x++ )
524 ( p_smooth[(y-1)*i_src_visible+x-1]
525 - p_smooth[(y+1)*i_src_visible+x-1] )
526 + ( ( p_smooth[(y-1)*i_src_visible+x]
527 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
528 + ( p_smooth[(y-1)*i_src_visible+x+1]
529 - p_smooth[(y+1)*i_src_visible+x+1] );
531 ( p_smooth[(y-1)*i_src_visible+x-1]
532 - p_smooth[(y-1)*i_src_visible+x+1] )
533 + ( ( p_smooth[y*i_src_visible+x-1]
534 - p_smooth[y*i_src_visible+x+1] ) <<1 )
535 + ( p_smooth[(y+1)*i_src_visible+x-1]
536 - p_smooth[(y+1)*i_src_visible+x+1] );
538 p_grad[y*i_src_visible+x] = (uint32_t)(abs( gradx ) + abs( grady ));
540 /* tan( 22.5 ) = 0,414213562 .. * 128 = 53
541 * tan( 26,565051177 ) = 0.5
542 * tan( 45 + 22.5 ) = 2,414213562 .. * 128 = 309
543 * tan( 63,434948823 ) 2 */
544 if( (grady<<1) > gradx )
545 p_theta[y*i_src_visible+x] = THETA_P;
546 else if( (grady<<1) < -gradx )
547 p_theta[y*i_src_visible+x] = THETA_M;
548 else if( !gradx || abs(grady) > abs(gradx)<<1 )
549 p_theta[y*i_src_visible+x] = THETA_Y;
551 p_theta[y*i_src_visible+x] = THETA_X;
556 for( y = 1; y < i_num_lines - 1; y++ )
558 for( x = 1; x < i_src_visible - 1; x++ )
560 if( p_grad[y*i_src_visible+x] > 40 )
562 switch( p_theta[y*i_src_visible+x] )
565 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x]
566 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x] )
568 p_outpix[y*i_dst_pitch+x] = 0;
570 } else goto colorize;
572 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x-1]
573 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x+1] )
575 p_outpix[y*i_dst_pitch+x] = 0;
577 } else goto colorize;
579 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x+1]
580 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x-1] )
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*i_src_visible+x-1]
587 && p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x+1] )
589 p_outpix[y*i_dst_pitch+x] = 0;
591 } else goto colorize;
597 if( p_filter->p_sys->b_cartoon )
599 if( p_smooth[y*i_src_visible+x] > 0xa0 )
600 p_outpix[y*i_dst_pitch+x] = (uint8_t)
601 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
602 else if( p_smooth[y*i_src_visible+x] > 0x70 )
603 p_outpix[y*i_dst_pitch+x] =(uint8_t)
604 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
605 else if( p_smooth[y*i_src_visible+x] > 0x28 )
606 p_outpix[y*i_dst_pitch+x] =(uint8_t)
607 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
609 p_outpix[y*i_dst_pitch+x] =(uint8_t)
610 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
617 /*****************************************************************************
619 *****************************************************************************/
620 #define p_pre_hough p_filter->p_sys->p_pre_hough
621 static void FilterHough( filter_t *p_filter, picture_t *p_inpic,
622 picture_t *p_outpic )
625 int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
626 int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
627 int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
629 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
631 int i_diag = sqrt( i_num_lines * i_num_lines +
632 i_src_visible * i_src_visible);
633 int i_max, i_phi_max, i_rho, i_rho_max;
635 double d_step = M_PI / i_nb_steps;
639 int *p_hough = malloc( i_diag * i_nb_steps * sizeof(int) );
640 if( ! p_hough ) return;
641 p_smooth = (uint32_t *)malloc( i_num_lines*i_src_visible*sizeof(uint32_t));
642 if( !p_smooth ) return;
646 msg_Dbg(p_filter, "Starting precalculation");
647 p_pre_hough = malloc( i_num_lines*i_src_visible*i_nb_steps*sizeof(int));
648 if( ! p_pre_hough ) return;
649 for( i = 0 ; i < i_nb_steps ; i++)
651 d_sin = sin(d_step * i);
652 d_cos = cos(d_step * i);
653 for( y = 0 ; y < i_num_lines ; y++ )
654 for( x = 0 ; x < i_src_visible ; x++ )
656 p_pre_hough[(i*i_num_lines+y)*i_src_visible + x] =
657 ceil(x*d_sin + y*d_cos);
660 msg_Dbg(p_filter, "Precalculation done");
663 vlc_memset( p_hough, 0, i_diag * i_nb_steps * sizeof(int) );
666 p_outpic->p[Y_PLANE].p_pixels, p_inpic->p[Y_PLANE].p_pixels,
667 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
669 p_outpic->p[U_PLANE].p_pixels, p_inpic->p[U_PLANE].p_pixels,
670 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
672 p_outpic->p[V_PLANE].p_pixels, p_inpic->p[V_PLANE].p_pixels,
673 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
675 GaussianConvolution( p_inpic, p_smooth );
680 | -2 0 2 | and | 0 0 0 |
681 | -1 0 1 | | -1 -2 -1 | */
686 for( y = 4; y < i_num_lines - 4; y++ )
688 for( x = 4; x < i_src_visible - 4; x++ )
693 ( ( p_smooth[(y-1)*i_src_visible+x]
694 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
695 + ( p_smooth[(y-1)*i_src_visible+x-1]
696 - p_smooth[(y+1)*i_src_visible+x-1] )
697 + ( p_smooth[(y-1)*i_src_visible+x+1]
698 - p_smooth[(y+1)*i_src_visible+x+1] )
702 ( ( p_smooth[y*i_src_visible+x-1]
703 - p_smooth[y*i_src_visible+x+1] ) <<1 )
704 + ( p_smooth[(y-1)*i_src_visible+x-1]
705 - p_smooth[(y-1)*i_src_visible+x+1] )
706 + ( p_smooth[(y+1)*i_src_visible+x-1]
707 - p_smooth[(y+1)*i_src_visible+x+1] )
712 for( i = 0 ; i < i_nb_steps ; i ++ )
714 i_rho = p_pre_hough[(i*i_num_lines+y)*i_src_visible + x];
715 if( p_hough[i_rho + i_diag/2 + i * i_diag]++ > i_max )
717 i_max = p_hough[i_rho + i_diag/2 + i * i_diag];
726 d_sin = sin(i_phi_max*d_step);
727 d_cos = cos(i_phi_max*d_step);
730 for( x = 0 ; x < i_src_visible ; x++ )
732 y = (i_rho_max - x * d_sin) / d_cos;
733 if( y >= 0 && y < i_num_lines )
734 p_outpix[y*i_dst_pitch+x] = 255;
744 static int GradientCallback( vlc_object_t *p_this, char const *psz_var,
745 vlc_value_t oldval, vlc_value_t newval,
749 filter_sys_t *p_sys = (filter_sys_t *)p_data;
750 if( !strcmp( psz_var, FILTER_PREFIX "mode" ) )
752 if( !strcmp( newval.psz_string, "gradient" ) )
754 p_sys->i_mode = GRADIENT;
756 else if( !strcmp( newval.psz_string, "edge" ) )
758 p_sys->i_mode = EDGE;
760 else if( !strcmp( newval.psz_string, "hough" ) )
762 p_sys->i_mode = HOUGH;
766 msg_Err( p_this, "no valid gradient mode provided (%s)", newval.psz_string );
767 p_sys->i_mode = GRADIENT;
770 else if( !strcmp( psz_var, FILTER_PREFIX "type" ) )
772 p_sys->i_gradient_type = newval.i_int;
774 else if( !strcmp( psz_var, FILTER_PREFIX "cartoon" ) )
776 p_sys->b_cartoon = newval.b_bool;