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 = filter_NewPicture( p_filter );
239 picture_Release( p_pic );
243 switch( p_filter->p_sys->i_mode )
246 FilterEdge( p_filter, p_pic, p_outpic );
250 FilterGradient( p_filter, p_pic, p_outpic );
254 FilterHough( p_filter, p_pic, p_outpic );
261 return CopyInfoAndRelease( p_outpic, p_pic );
264 /*****************************************************************************
265 * Gaussian Convolution
266 *****************************************************************************
267 * Gaussian convolution ( sigma == 1.4 )
269 * | 2 4 5 4 2 | | 2 4 4 4 2 |
270 * | 4 9 12 9 4 | | 4 8 12 8 4 |
271 * | 5 12 15 12 5 | ~ | 4 12 16 12 4 |
272 * | 4 9 12 9 4 | | 4 8 12 8 4 |
273 * | 2 4 5 4 2 | | 2 4 4 4 2 |
274 *****************************************************************************/
275 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
277 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
278 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
279 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
280 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
283 for( y = 2; y < i_num_lines - 2; y++ )
285 for( x = 2; x < i_src_visible - 2; x++ )
287 p_smooth[y*i_src_visible+x] = (uint32_t)(
289 ( p_inpix[(y-2)*i_src_pitch+x-2] )
290 + ((p_inpix[(y-2)*i_src_pitch+x-1]
291 + p_inpix[(y-2)*i_src_pitch+x]
292 + p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
293 + ( p_inpix[(y-2)*i_src_pitch+x+2] )
295 + ((p_inpix[(y-1)*i_src_pitch+x-2]
296 + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
297 + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
298 + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
299 + p_inpix[(y-1)*i_src_pitch+x+2]
301 + p_inpix[y*i_src_pitch+x-2]
302 + ( p_inpix[y*i_src_pitch+x-1]*3 )
303 + ( p_inpix[y*i_src_pitch+x]<<2 )
304 + ( p_inpix[y*i_src_pitch+x+1]*3 )
305 + p_inpix[y*i_src_pitch+x+2]
307 + p_inpix[(y+1)*i_src_pitch+x-2]
308 + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
309 + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
310 + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
311 + p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
313 + ( p_inpix[(y+2)*i_src_pitch+x-2] )
314 + ((p_inpix[(y+2)*i_src_pitch+x-1]
315 + p_inpix[(y+2)*i_src_pitch+x]
316 + p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
317 + ( p_inpix[(y+2)*i_src_pitch+x+2] )
323 /*****************************************************************************
324 * FilterGradient: Sobel
325 *****************************************************************************/
326 static void FilterGradient( filter_t *p_filter, picture_t *p_inpic,
327 picture_t *p_outpic )
330 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
331 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
332 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
333 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
335 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
336 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
339 if( !p_filter->p_sys->p_buf32 )
340 p_filter->p_sys->p_buf32 =
341 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
342 p_smooth = p_filter->p_sys->p_buf32;
344 if( !p_smooth ) return;
346 if( p_filter->p_sys->b_cartoon )
348 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
349 p_inpic->p[U_PLANE].p_pixels,
350 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
351 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
352 p_inpic->p[V_PLANE].p_pixels,
353 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
357 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
358 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
359 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
360 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
363 GaussianConvolution( p_inpic, p_smooth );
368 | -2 0 2 | and | 0 0 0 |
369 | -1 0 1 | | -1 -2 -1 | */
372 for( y = 1; y < i_num_lines - 1; y++ ) \
374 for( x = 1; x < i_src_visible - 1; x++ ) \
379 ( p_smooth[(y-1)*i_src_visible+x-1] \
380 - p_smooth[(y+1)*i_src_visible+x-1] ) \
381 + ( ( p_smooth[(y-1)*i_src_visible+x] \
382 - p_smooth[(y+1)*i_src_visible+x] ) <<1 ) \
383 + ( p_smooth[(y-1)*i_src_visible+x+1] \
384 - p_smooth[(y+1)*i_src_visible+x+1] ) \
388 ( p_smooth[(y-1)*i_src_visible+x-1] \
389 - p_smooth[(y-1)*i_src_visible+x+1] ) \
390 + ( ( p_smooth[y*i_src_visible+x-1] \
391 - p_smooth[y*i_src_visible+x+1] ) <<1 ) \
392 + ( p_smooth[(y+1)*i_src_visible+x-1] \
393 - p_smooth[(y+1)*i_src_visible+x+1] ) \
396 if( p_filter->p_sys->i_gradient_type )
398 if( p_filter->p_sys->b_cartoon )
403 p_outpix[y*i_dst_pitch+x] = 0x00;
407 if( p_smooth[y*i_src_visible+x] > 0xa0 )
408 p_outpix[y*i_dst_pitch+x] =
409 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
410 else if( p_smooth[y*i_src_visible+x] > 0x70 )
411 p_outpix[y*i_dst_pitch+x] =
412 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
413 else if( p_smooth[y*i_src_visible+x] > 0x28 )
414 p_outpix[y*i_dst_pitch+x] =
415 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
417 p_outpix[y*i_dst_pitch+x] =
418 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
425 p_outpix[y*i_dst_pitch+x] = clip_uint8_vlc( a );
433 p_outpix[y*i_dst_pitch+x] = 0;
435 p_outpix[y*i_dst_pitch+x] = 0xff-(uint8_t)a;
441 /*****************************************************************************
442 * FilterEdge: Canny edge detection algorithm
443 *****************************************************************************
444 * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
445 * (well ... my implementation isn't really the canny algorithm ... but some
446 * ideas are the same)
447 *****************************************************************************/
456 static void FilterEdge( filter_t *p_filter, picture_t *p_inpic,
457 picture_t *p_outpic )
461 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
462 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
463 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
464 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
466 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
467 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
473 if( !p_filter->p_sys->p_buf32 )
474 p_filter->p_sys->p_buf32 =
475 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
476 p_smooth = p_filter->p_sys->p_buf32;
478 if( !p_filter->p_sys->p_buf32_bis )
479 p_filter->p_sys->p_buf32_bis =
480 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
481 p_grad = p_filter->p_sys->p_buf32_bis;
483 if( !p_filter->p_sys->p_buf8 )
484 p_filter->p_sys->p_buf8 =
485 (uint8_t *)malloc( i_num_lines * i_src_visible * sizeof(uint8_t));
486 p_theta = p_filter->p_sys->p_buf8;
488 if( !p_smooth || !p_grad || !p_theta ) return;
490 if( p_filter->p_sys->b_cartoon )
492 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels,
493 p_inpic->p[U_PLANE].p_pixels,
494 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
495 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels,
496 p_inpic->p[V_PLANE].p_pixels,
497 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
501 vlc_memset( p_outpic->p[Y_PLANE].p_pixels, 0xff,
502 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
503 vlc_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
504 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
505 vlc_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
506 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
509 GaussianConvolution( p_inpic, p_smooth );
514 | -2 0 2 | and | 0 0 0 |
515 | -1 0 1 | | -1 -2 -1 | */
517 for( y = 1; y < i_num_lines - 1; y++ )
519 for( x = 1; x < i_src_visible - 1; x++ )
523 ( p_smooth[(y-1)*i_src_visible+x-1]
524 - p_smooth[(y+1)*i_src_visible+x-1] )
525 + ( ( p_smooth[(y-1)*i_src_visible+x]
526 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
527 + ( p_smooth[(y-1)*i_src_visible+x+1]
528 - p_smooth[(y+1)*i_src_visible+x+1] );
530 ( p_smooth[(y-1)*i_src_visible+x-1]
531 - p_smooth[(y-1)*i_src_visible+x+1] )
532 + ( ( p_smooth[y*i_src_visible+x-1]
533 - p_smooth[y*i_src_visible+x+1] ) <<1 )
534 + ( p_smooth[(y+1)*i_src_visible+x-1]
535 - p_smooth[(y+1)*i_src_visible+x+1] );
537 p_grad[y*i_src_visible+x] = (uint32_t)(abs( gradx ) + abs( grady ));
539 /* tan( 22.5 ) = 0,414213562 .. * 128 = 53
540 * tan( 26,565051177 ) = 0.5
541 * tan( 45 + 22.5 ) = 2,414213562 .. * 128 = 309
542 * tan( 63,434948823 ) 2 */
543 if( (grady<<1) > gradx )
544 p_theta[y*i_src_visible+x] = THETA_P;
545 else if( (grady<<1) < -gradx )
546 p_theta[y*i_src_visible+x] = THETA_M;
547 else if( !gradx || abs(grady) > abs(gradx)<<1 )
548 p_theta[y*i_src_visible+x] = THETA_Y;
550 p_theta[y*i_src_visible+x] = THETA_X;
555 for( y = 1; y < i_num_lines - 1; y++ )
557 for( x = 1; x < i_src_visible - 1; x++ )
559 if( p_grad[y*i_src_visible+x] > 40 )
561 switch( p_theta[y*i_src_visible+x] )
564 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x]
565 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x] )
567 p_outpix[y*i_dst_pitch+x] = 0;
569 } else goto colorize;
571 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x-1]
572 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x+1] )
574 p_outpix[y*i_dst_pitch+x] = 0;
576 } else goto colorize;
578 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x+1]
579 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x-1] )
581 p_outpix[y*i_dst_pitch+x] = 0;
583 } else goto colorize;
585 if( p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x-1]
586 && p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x+1] )
588 p_outpix[y*i_dst_pitch+x] = 0;
590 } else goto colorize;
596 if( p_filter->p_sys->b_cartoon )
598 if( p_smooth[y*i_src_visible+x] > 0xa0 )
599 p_outpix[y*i_dst_pitch+x] = (uint8_t)
600 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
601 else if( p_smooth[y*i_src_visible+x] > 0x70 )
602 p_outpix[y*i_dst_pitch+x] =(uint8_t)
603 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
604 else if( p_smooth[y*i_src_visible+x] > 0x28 )
605 p_outpix[y*i_dst_pitch+x] =(uint8_t)
606 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
608 p_outpix[y*i_dst_pitch+x] =(uint8_t)
609 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
616 /*****************************************************************************
618 *****************************************************************************/
619 #define p_pre_hough p_filter->p_sys->p_pre_hough
620 static void FilterHough( filter_t *p_filter, picture_t *p_inpic,
621 picture_t *p_outpic )
624 int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
625 int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
626 int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
628 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
630 int i_diag = sqrt( i_num_lines * i_num_lines +
631 i_src_visible * i_src_visible);
632 int i_max, i_phi_max, i_rho, i_rho_max;
634 double d_step = M_PI / i_nb_steps;
638 int *p_hough = malloc( i_diag * i_nb_steps * sizeof(int) );
639 if( ! p_hough ) return;
640 p_smooth = (uint32_t *)malloc( i_num_lines*i_src_visible*sizeof(uint32_t));
641 if( !p_smooth ) return;
645 msg_Dbg(p_filter, "Starting precalculation");
646 p_pre_hough = malloc( i_num_lines*i_src_visible*i_nb_steps*sizeof(int));
647 if( ! p_pre_hough ) return;
648 for( i = 0 ; i < i_nb_steps ; i++)
650 d_sin = sin(d_step * i);
651 d_cos = cos(d_step * i);
652 for( y = 0 ; y < i_num_lines ; y++ )
653 for( x = 0 ; x < i_src_visible ; x++ )
655 p_pre_hough[(i*i_num_lines+y)*i_src_visible + x] =
656 ceil(x*d_sin + y*d_cos);
659 msg_Dbg(p_filter, "Precalculation done");
662 vlc_memset( p_hough, 0, i_diag * i_nb_steps * sizeof(int) );
665 p_outpic->p[Y_PLANE].p_pixels, p_inpic->p[Y_PLANE].p_pixels,
666 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
668 p_outpic->p[U_PLANE].p_pixels, p_inpic->p[U_PLANE].p_pixels,
669 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
671 p_outpic->p[V_PLANE].p_pixels, p_inpic->p[V_PLANE].p_pixels,
672 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
674 GaussianConvolution( p_inpic, p_smooth );
679 | -2 0 2 | and | 0 0 0 |
680 | -1 0 1 | | -1 -2 -1 | */
685 for( y = 4; y < i_num_lines - 4; y++ )
687 for( x = 4; x < i_src_visible - 4; x++ )
692 ( ( p_smooth[(y-1)*i_src_visible+x]
693 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
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] )
701 ( ( p_smooth[y*i_src_visible+x-1]
702 - p_smooth[y*i_src_visible+x+1] ) <<1 )
703 + ( p_smooth[(y-1)*i_src_visible+x-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] )
711 for( i = 0 ; i < i_nb_steps ; i ++ )
713 i_rho = p_pre_hough[(i*i_num_lines+y)*i_src_visible + x];
714 if( p_hough[i_rho + i_diag/2 + i * i_diag]++ > i_max )
716 i_max = p_hough[i_rho + i_diag/2 + i * i_diag];
725 d_sin = sin(i_phi_max*d_step);
726 d_cos = cos(i_phi_max*d_step);
729 for( x = 0 ; x < i_src_visible ; x++ )
731 y = (i_rho_max - x * d_sin) / d_cos;
732 if( y >= 0 && y < i_num_lines )
733 p_outpix[y*i_dst_pitch+x] = 255;
743 static int GradientCallback( vlc_object_t *p_this, char const *psz_var,
744 vlc_value_t oldval, vlc_value_t newval,
748 filter_sys_t *p_sys = (filter_sys_t *)p_data;
749 if( !strcmp( psz_var, FILTER_PREFIX "mode" ) )
751 if( !strcmp( newval.psz_string, "gradient" ) )
753 p_sys->i_mode = GRADIENT;
755 else if( !strcmp( newval.psz_string, "edge" ) )
757 p_sys->i_mode = EDGE;
759 else if( !strcmp( newval.psz_string, "hough" ) )
761 p_sys->i_mode = HOUGH;
765 msg_Err( p_this, "no valid gradient mode provided (%s)", newval.psz_string );
766 p_sys->i_mode = GRADIENT;
769 else if( !strcmp( psz_var, FILTER_PREFIX "type" ) )
771 p_sys->i_gradient_type = newval.i_int;
773 else if( !strcmp( psz_var, FILTER_PREFIX "cartoon" ) )
775 p_sys->b_cartoon = newval.b_bool;