/* * Linux VeeJay * * Copyright(C)2004 Niels Elburg * * 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 #include #include #include "rgbkey.h" #include #include #include "common.h" #include "complexthreshold.h" vj_effect *complexthreshold_init(int w, int h) { vj_effect *ve; ve = (vj_effect *) vj_calloc(sizeof(vj_effect)); ve->num_params = 6; 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] = 4500; /* angle */ ve->defaults[1] = 0; /* r */ ve->defaults[2] = 0; /* g */ ve->defaults[3] = 255; /* b */ ve->defaults[4] = 1; /* smoothen level */ ve->defaults[5] = 255; /* threshold */ ve->limits[0][0] = 1; ve->limits[1][0] = 9000; ve->limits[0][1] = 0; ve->limits[1][1] = 255; ve->limits[0][2] = 0; ve->limits[1][2] = 255; ve->limits[0][3] = 0; ve->limits[1][3] = 255; ve->limits[0][5] = 0; ve->limits[1][5] = 255; ve->limits[0][4] = 0; ve->limits[1][4] = 4; ve->parallel = 1; ve->description = "Complex Threshold (RGB)"; ve->extra_frame = 1; ve->sub_format = 1; ve->has_user = 0; ve->rgb_conv = 1; ve->param_description = vje_build_param_list( ve->num_params,"Angle", "Red", "Green", "Blue", "Smoothen", "Threshold" ); return ve; } /* this method decides whether or not a pixel from the fg will be accepted for keying */ int accept_tpixel(uint8_t fg_cb, uint8_t fg_cr, int cb, int cr, int accept_angle_tg) { short xx, yy; /* convert foreground to xz coordinates where x direction is defined by key color */ uint8_t val; xx = ((fg_cb * cb) + (fg_cr * cr)) >> 7; yy = ((fg_cr * cb) - (fg_cb * cr)) >> 7; /* accept angle should not be > 90 degrees reasonable results between 10 and 80 degrees. */ val = (xx * accept_angle_tg) >> 4; if (abs(yy) < val) { return 1; } return 0; } void complexthreshold_apply(VJFrame *frame, VJFrame *frame2, int width, int height, int i_angle, int r, int g, int b, int level, int threshold) { uint8_t *fg_y, *fg_cb, *fg_cr; uint8_t *bg_y, *bg_cb, *bg_cr; int accept_angle_tg, accept_angle_ctg, one_over_kc; int kfgy_scale, kg; int cb, cr; int kbg, x1, y1; float kg1, tmp, aa = 255.0f, bb = 255.0f, _y = 0; float angle = (float) i_angle / 100.0f; //float noise_level = 350.0; unsigned int pos; int matrix[5]; int val, tmp1; const int len = frame->len; uint8_t *Y = frame->data[0]; uint8_t *Cb = frame->data[1]; uint8_t *Cr = frame->data[2]; uint8_t *Y2 = frame2->data[0]; uint8_t *Cb2 = frame2->data[1]; uint8_t *Cr2 = frame2->data[2]; int iy,iv,iu; _rgb2yuv(r,g,b,iy,iu,iv); _y = (float)iy; aa = (float)iu; bb = (float)iv; tmp = sqrt(((aa * aa) + (bb * bb))); cb = 255 * (aa / tmp); cr = 255 * (bb / tmp); kg1 = tmp; /* obtain coordinate system for cb / cr */ accept_angle_tg = 0xf * tan(M_PI * angle / 180.0); accept_angle_ctg = 0xf / tan(M_PI * angle / 180.0); tmp = 1 / kg1; one_over_kc = 0xff * 2 * tmp - 0xff; kfgy_scale = 0xf * (float) (_y) / kg1; kg = kg1; /* intialize pointers */ fg_y = Y2; fg_cb = Cb2; fg_cr = Cr2; bg_y = Y; bg_cb = Cb; bg_cr = Cr; for (pos = width + 1; pos < (len) - width - 1; pos++) { int i = 0; int smooth = 0; /* setup matrix [ - 0 - ] = do not accept. [ - 1 - ] = level 5 , accept only when all n = 1 [ 0 0 0 ] [ 1 1 1 ] [ - 0 - ] [ - 1 - ] [ - 0 - ] sum of all n is acceptance value for level [ 1 0 1 ] [ 0 1 0 ] */ matrix[0] = accept_tpixel(fg_cb[pos], fg_cr[pos], cb, cr, accept_angle_tg); /* center pixel */ matrix[1] = accept_tpixel(fg_cb[pos - 1], fg_cr[pos - 1], cb, cr, accept_angle_tg); /* left pixel */ matrix[2] = accept_tpixel(fg_cb[pos + 1], fg_cr[pos + 1], cb, cr, accept_angle_tg); /* right pixel */ matrix[3] = accept_tpixel(fg_cb[pos + width], fg_cr[pos + width], cb, cr, accept_angle_tg); /* top pixel */ matrix[4] = accept_tpixel(fg_cb[pos - width], fg_cr[pos - width], cb, cr, accept_angle_tg); /* bottom pixel */ for (i = 0; i < 5; i++) { if (matrix[i] == 1) smooth++; } if (smooth >= level) { short xx, yy; /* get bg/fg pixels */ uint8_t p1 = (matrix[0] == 0 ? fg_y[pos] : bg_y[pos]); uint8_t p2 = (matrix[1] == 0 ? fg_y[pos - 1] : bg_y[pos - 1]); uint8_t p3 = (matrix[2] == 0 ? fg_y[pos + 1] : bg_y[pos + 1]); uint8_t p4 = (matrix[3] == 0 ? fg_y[pos + width] : bg_y[pos + width]); uint8_t p5 = (matrix[4] == 0 ? fg_y[pos - width] : bg_y[pos - width]); /* and blur the pixel */ fg_y[pos] = (p1 + p2 + p3 + p4 + p5 + p1) / 6; /* convert foreground to xz coordinates where x direction is defined by key color */ xx = (((fg_cb[pos]) * cb) + ((fg_cr[pos]) * cr)) >> 7; yy = (((fg_cr[pos]) * cb) - ((fg_cb[pos]) * cr)) >> 7; val = (xx * accept_angle_tg) >> 4; /* see if pixel is within range of color and threshold */ if (abs(yy) < val && fg_y[pos] > threshold) { val = (yy * accept_angle_ctg) >> 4; x1 = abs(val); y1 = yy; tmp1 = xx - x1; kbg = (tmp1 * one_over_kc) >> 1; val = (tmp1 * kfgy_scale) >> 4; Y[pos] = fg_y[pos] - val; /* convert suppressed fg back to cbcr */ Cb[pos] = ((x1 * cb) - (y1 * cr)) >> 7; Cr[pos] = ((x1 * cr) - (y1 * cb)) >> 7; Y[pos] = (Y[pos] + (kbg * bg_y[pos])) >> 8; Cb[pos] = (Cb[pos] + (kbg * bg_cb[pos])) >> 8; Cr[pos] = (Cr[pos] + (kbg * bg_cr[pos])) >> 8; } } } } void complexthreshold_free(){}