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#N canvas 496 25 656 859 10;
#X obj 7 360 pix_drum;
#X obj 7 424 pix_texture;
#N canvas 593 327 562 332 inlet1 0;
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#X obj 37 20 loadbang;
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#X msg 20 111 1;
#X msg 1 92 2;
#X text 79 190 thresh;
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#X obj 185 222 t b f;
#X floatatom 247 178 5 0 0 0 - - -;
#X obj 232 223 t b f;
#X obj 138 219 t b f;
#X text 127 190 pix_dist;
#X text 187 190 minpeak;
#X floatatom 300 178 5 0 0 0 - - -;
#X obj 280 221 t b f;
#X obj 160 278 pack f f f f f f;
#X obj 160 298 outlet;
#X text 41 190 mode;
#X text 169 14 first inlet takes the threshold value (0-1);
#X text 240 190 min_wid;
#X text 290 190 dist_ctr;
#X msg 144 106 12;
#X msg 222 108 0.12;
#X msg 307 108 10;
#X msg 390 109 12;
#X msg 83 105 0.4;
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#X obj 18 265 outlet;
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#X obj 124 94 r refresh;
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#X text 66 160 head;
#X text 112 160 left;
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#X obj 7 297 gemhead 1;
#X obj 7 318 pix_video;
#X obj 7 339 pix_grey;
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#X msg 126 65 dimen 320 240;
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302 \;;
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#X text 292 269 bottom \, top \, right \, left;
#X text 57 83 mode: selescts mode of operation (0 \, 1 or 2);
#X text 56 121 thresh: threshold for contrast (0-1);
#X text 6 494 pix_drum looks for black pixels incoming from the top
a video frame.;
#X text 6 522 The algorithm makes a histogram of how many black pixels
there are per column.;
#X text 7 631 the convexity test takes the form of:;
#X text 62 645 y = hist[i] - (hist[i-x]*.05 + hist[i+x]);
#X text 6 551 It then finds the highet point in the histogram \, that
is \, the highest peak \, called the primary peak.;
#X text 56 131 pix_dist: number of pixels around a center \, x in function
below;
#X text 98 97 mode 2 is the current regular function (others used for
debugging);
#X text 56 155 tip scalar: scalar of maximum height in concavity test
graph \, values higher than this scaled height are part of a peak;
#X text 57 189 min_width: minimum number of contiguous values higher
than scaled height to report a peak;
#X text 57 213 dist_ctr: minimum distance from primary peak to report
a secondary peak.;
#X text 265 257 INLET 2: defines the bounds of the anrea of analysis
;
#X text 56 68 INLET 1: Analysis Parameters;
#X text 6 471 INFORMATION;
#X text 6 579 It then finds the area of black pixels on either side
of the primary peak. (Left Area and Right Area);
#X text 7 605 It then performs a convexity test \, on both sides of
the primary peak.;
#X text 9 660 where (x) is a deviation from the center (i). If the
line is straight y=0 \, if it is concave or convex \, hey are negative
or positive.;
#X text 11 699 The results of this test are recroded in a graph. secondary
peaks are the point where two concave curves meet \, which therefore
has a higher value for y in the concavity text.;
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#X text 103 105 print?;
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#X restore 99 386 pd print;
#X text 189 302 OUTLETS;
#X text 188 323 outlet 0: the analyzed video image;
#X text 188 337 outlet 1: primary peak information;
#X text 211 368 Areas are normalized;
#X text 189 383 outlet 2: secondary peak information;
#X text 212 415 side: At which side of the 1ry preak is the secondary
peak.;
#X text 246 427 Left = 0 \, Right = 1;
#X text 220 353 [x coord. \, y coord. \, Left Area \, Right Area];
#X text 222 399 [side \, index \, x coord. \, y coord.];
#X text 213 440 index: index 0 - n of each secondary peak.;
#X obj 7 448 rectangle 5.33 4;
#X text 115 808 support information in www.jaimeoliver.pe;
#X text 229 822 jaime.oliver@gmail.com;
#X text 249 837 joliverl-2010 v0.01;
#X text 193 454 outlets 3 and 4 are currently not supported;
#X text 12 756 This object was programmed as part of the Silent Percussion
Proect \, for use in the Silent Drum Controller. For more infomation:
http://www.jaimeoliver.pe/drum;
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