| 1 | /* |
| 2 | * transformfloat.c |
| 3 | * |
| 4 | * Floating point image transformations |
| 5 | * |
| 6 | * Copyright (C) Georg Martius - June 2011 |
| 7 | * georg dot martius at web dot de |
| 8 | * |
| 9 | * This file is part of vid.stab video stabilization library |
| 10 | * |
| 11 | * vid.stab is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License, |
| 13 | * as published by the Free Software Foundation; either version 2, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * vid.stab is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with GNU Make; see the file COPYING. If not, write to |
| 23 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | * |
| 25 | */ |
| 26 | #include "transformfloat.h" |
| 27 | #include "transform.h" |
| 28 | #include "transformtype_operations.h" |
| 29 | |
| 30 | |
| 31 | /** interpolateBiLinBorder: bi-linear interpolation function that also works at the border. |
| 32 | This is used by many other interpolation methods at and outsize the border, see interpolate */ |
| 33 | void _FLT(interpolateBiLinBorder)(uint8_t *rv, float x, float y, |
| 34 | const uint8_t *img, int img_linesize, |
| 35 | int width, int height, uint8_t def) |
| 36 | { |
| 37 | int x_f = myfloor(x); |
| 38 | int x_c = x_f+1; |
| 39 | int y_f = myfloor(y); |
| 40 | int y_c = y_f+1; |
| 41 | short v1 = PIXEL(img, img_linesize, x_c, y_c, width, height, def); |
| 42 | short v2 = PIXEL(img, img_linesize, x_c, y_f, width, height, def); |
| 43 | short v3 = PIXEL(img, img_linesize, x_f, y_c, width, height, def); |
| 44 | short v4 = PIXEL(img, img_linesize, x_f, y_f, width, height, def); |
| 45 | float s = (v1*(x - x_f)+v3*(x_c - x))*(y - y_f) + |
| 46 | (v2*(x - x_f) + v4*(x_c - x))*(y_c - y); |
| 47 | *rv = (uint8_t)s; |
| 48 | } |
| 49 | |
| 50 | /** taken from http://en.wikipedia.org/wiki/Bicubic_interpolation for alpha=-0.5 |
| 51 | in matrix notation: |
| 52 | a0-a3 are the neigthboring points where the target point is between a1 and a2 |
| 53 | t is the point of interpolation (position between a1 and a2) value between 0 and 1 |
| 54 | | 0, 2, 0, 0 | |a0| |
| 55 | |-1, 0, 1, 0 | |a1| |
| 56 | (1,t,t^2,t^3) | 2,-5, 4,-1 | |a2| |
| 57 | |-1, 3,-3, 1 | |a3| |
| 58 | */ |
| 59 | static short _FLT(bicub_kernel)(float t, short a0, short a1, short a2, short a3){ |
| 60 | return (2*a1 + t*((-a0+a2) + t*((2*a0-5*a1+4*a2-a3) + t*(-a0+3*a1-3*a2+a3) )) ) / 2; |
| 61 | } |
| 62 | |
| 63 | /** interpolateBiCub: bi-cubic interpolation function using 4x4 pixel, see interpolate */ |
| 64 | void _FLT(interpolateBiCub)(uint8_t *rv, float x, float y, |
| 65 | const uint8_t *img, int img_linesize, |
| 66 | int width, int height, uint8_t def) |
| 67 | { |
| 68 | // do a simple linear interpolation at the border |
| 69 | if (x < 1 || x > width - 2 || y < 1 || y > height - 2) { |
| 70 | _FLT(interpolateBiLinBorder)(rv, x, y, img, img_linesize, width, height, def); |
| 71 | } else { |
| 72 | int x_f = myfloor(x); |
| 73 | int y_f = myfloor(y); |
| 74 | float tx = x-x_f; |
| 75 | short v1 = _FLT(bicub_kernel)(tx, |
| 76 | PIX(img, img_linesize, x_f-1, y_f-1), |
| 77 | PIX(img, img_linesize, x_f, y_f-1), |
| 78 | PIX(img, img_linesize, x_f+1, y_f-1), |
| 79 | PIX(img, img_linesize, x_f+2, y_f-1)); |
| 80 | short v2 = _FLT(bicub_kernel)(tx, |
| 81 | PIX(img, img_linesize, x_f-1, y_f), |
| 82 | PIX(img, img_linesize, x_f, y_f), |
| 83 | PIX(img, img_linesize, x_f+1, y_f), |
| 84 | PIX(img, img_linesize, x_f+2, y_f)); |
| 85 | short v3 = _FLT(bicub_kernel)(tx, |
| 86 | PIX(img, img_linesize, x_f-1, y_f+1), |
| 87 | PIX(img, img_linesize, x_f, y_f+1), |
| 88 | PIX(img, img_linesize, x_f+1, y_f+1), |
| 89 | PIX(img, img_linesize, x_f+2, y_f+1)); |
| 90 | short v4 = _FLT(bicub_kernel)(tx, |
| 91 | PIX(img, img_linesize, x_f-1, y_f+2), |
| 92 | PIX(img, img_linesize, x_f, y_f+2), |
| 93 | PIX(img, img_linesize, x_f+1, y_f+2), |
| 94 | PIX(img, img_linesize, x_f+2, y_f+2)); |
| 95 | *rv = (uint8_t)_FLT(bicub_kernel)(y-y_f, v1, v2, v3, v4); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | |
| 100 | /** interpolateBiLin: bi-linear interpolation function, see interpolate */ |
| 101 | void _FLT(interpolateBiLin)(uint8_t *rv, float x, float y, |
| 102 | const uint8_t *img, int img_linesize, |
| 103 | int width, int height, uint8_t def) |
| 104 | { |
| 105 | if (x < 0 || x > width - 1 || y < 0 || y > height - 1) { |
| 106 | _FLT(interpolateBiLinBorder)(rv, x, y, img, img_linesize, width, height, def); |
| 107 | } else { |
| 108 | int x_f = myfloor(x); |
| 109 | int x_c = x_f+1; |
| 110 | int y_f = myfloor(y); |
| 111 | int y_c = y_f+1; |
| 112 | short v1 = PIX(img, img_linesize, x_c, y_c); |
| 113 | short v2 = PIX(img, img_linesize, x_c, y_f); |
| 114 | short v3 = PIX(img, img_linesize, x_f, y_c); |
| 115 | short v4 = PIX(img, img_linesize, x_f, y_f); |
| 116 | float s = (v1*(x - x_f)+v3*(x_c - x))*(y - y_f) + |
| 117 | (v2*(x - x_f) + v4*(x_c - x))*(y_c - y); |
| 118 | *rv = (uint8_t)s; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | |
| 123 | /** interpolateLin: linear (only x) interpolation function, see interpolate */ |
| 124 | void _FLT(interpolateLin)(uint8_t *rv, float x, float y, |
| 125 | const uint8_t *img, int img_linesize, |
| 126 | int width, int height, uint8_t def) |
| 127 | { |
| 128 | int x_f = myfloor(x); |
| 129 | int x_c = x_f+1; |
| 130 | int y_n = myround(y); |
| 131 | float v1 = PIXEL(img, img_linesize, x_c, y_n, width, height, def); |
| 132 | float v2 = PIXEL(img, img_linesize, x_f, y_n, width, height, def); |
| 133 | float s = v1*(x - x_f) + v2*(x_c - x); |
| 134 | *rv = (uint8_t)s; |
| 135 | } |
| 136 | |
| 137 | /** interpolateZero: nearest neighbor interpolation function, see interpolate */ |
| 138 | void _FLT(interpolateZero)(uint8_t *rv, float x, float y, |
| 139 | const uint8_t *img, int img_linesize, |
| 140 | int width, int height, uint8_t def) |
| 141 | { |
| 142 | int x_n = myround(x); |
| 143 | int y_n = myround(y); |
| 144 | *rv = (uint8_t) PIXEL(img, img_linesize, x_n, y_n, width, height, def); |
| 145 | } |
| 146 | |
| 147 | |
| 148 | /** |
| 149 | * interpolateN: Bi-linear interpolation function for N channel image. |
| 150 | * |
| 151 | * Parameters: |
| 152 | * rv: destination pixel (call by reference) |
| 153 | * x,y: the source coordinates in the image img. Note this |
| 154 | * are real-value coordinates, that's why we interpolate |
| 155 | * img: source image |
| 156 | * width,height: dimension of image |
| 157 | * N: number of channels |
| 158 | * channel: channel number (0..N-1) |
| 159 | * def: default value if coordinates are out of range |
| 160 | * Return value: None |
| 161 | */ |
| 162 | void _FLT(interpolateN)(uint8_t *rv, float x, float y, |
| 163 | const uint8_t *img, int img_linesize, |
| 164 | int width, int height, |
| 165 | uint8_t N, uint8_t channel, |
| 166 | uint8_t def) |
| 167 | { |
| 168 | if (x < - 1 || x > width || y < -1 || y > height) { |
| 169 | *rv = def; |
| 170 | } else { |
| 171 | int x_f = myfloor(x); |
| 172 | int x_c = x_f+1; |
| 173 | int y_f = myfloor(y); |
| 174 | int y_c = y_f+1; |
| 175 | short v1 = PIXELN(img, img_linesize, x_c, y_c, width, height, N, channel, def); |
| 176 | short v2 = PIXELN(img, img_linesize, x_c, y_f, width, height, N, channel, def); |
| 177 | short v3 = PIXELN(img, img_linesize, x_f, y_c, width, height, N, channel, def); |
| 178 | short v4 = PIXELN(img, img_linesize, x_f, y_f, width, height, N, channel, def); |
| 179 | float s = (v1*(x - x_f)+v3*(x_c - x))*(y - y_f) + |
| 180 | (v2*(x - x_f) + v4*(x_c - x))*(y_c - y); |
| 181 | *rv = (uint8_t)s; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | |
| 186 | /** |
| 187 | * transformPacked: applies current transformation to frame |
| 188 | * Parameters: |
| 189 | * td: private data structure of this filter |
| 190 | * Return value: |
| 191 | * 0 for failture, 1 for success |
| 192 | * Preconditions: |
| 193 | * The frame must be in Packed format |
| 194 | /// TODO Add zoom! |
| 195 | /// Add bytes per pixel usage |
| 196 | */ |
| 197 | int _FLT(transformPacked)(VSTransformData* td, VSTransform t) |
| 198 | { |
| 199 | int x = 0, y = 0, z = 0; |
| 200 | uint8_t *D_1, *D_2; |
| 201 | char crop = td->conf.crop; |
| 202 | |
| 203 | D_1 = td->src.data[0]; |
| 204 | D_2 = td->destbuf.data[0]; |
| 205 | float c_s_x = td->fiSrc.width/2.0; |
| 206 | float c_s_y = td->fiSrc.height/2.0; |
| 207 | float c_d_x = td->fiDest.width/2.0; |
| 208 | float c_d_y = td->fiDest.height/2.0; |
| 209 | |
| 210 | /* for each pixel in the destination image we calc the source |
| 211 | * coordinate and make an interpolation: |
| 212 | * p_d = c_d + M(p_s - c_s) + t |
| 213 | * where p are the points, c the center coordinate, |
| 214 | * _s source and _d destination, |
| 215 | * t the translation, and M the rotation matrix |
| 216 | * p_s = M^{-1}(p_d - c_d - t) + c_s |
| 217 | */ |
| 218 | int channels = td->fiSrc.bytesPerPixel; |
| 219 | /* All channels */ |
| 220 | if (fabs(t.alpha) > 0.1*M_PI/180.0) { // 0.1 deg |
| 221 | for (x = 0; x < td->fiDest.width; x++) { |
| 222 | for (y = 0; y < td->fiDest.height; y++) { |
| 223 | float x_d1 = (x - c_d_x); |
| 224 | float y_d1 = (y - c_d_y); |
| 225 | float x_s = cos(-t.alpha) * x_d1 |
| 226 | + sin(-t.alpha) * y_d1 + c_s_x -t.x; |
| 227 | float y_s = -sin(-t.alpha) * x_d1 |
| 228 | + cos(-t.alpha) * y_d1 + c_s_y -t.y; |
| 229 | for (z = 0; z < channels; z++) { // iterate over colors |
| 230 | uint8_t *dest = &D_2[x + y * td->destbuf.linesize[0]+z]; |
| 231 | _FLT(interpolateN)(dest, x_s, y_s, D_1, td->src.linesize[0], |
| 232 | td->fiSrc.width, td->fiSrc.height, |
| 233 | channels, z, crop ? 16 : *dest); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | }else { |
| 238 | /* no rotation, just translation |
| 239 | *(also no interpolation, since no size change (so far) |
| 240 | */ |
| 241 | int round_tx = myround(t.x); |
| 242 | int round_ty = myround(t.y); |
| 243 | for (x = 0; x < td->fiDest.width; x++) { |
| 244 | for (y = 0; y < td->fiDest.height; y++) { |
| 245 | for (z = 0; z < channels; z++) { // iterate over colors |
| 246 | short p = PIXELN(D_1, td->src.linesize[0], x - round_tx, y - round_ty, |
| 247 | td->fiSrc.width, td->fiSrc.height, channels, z, -1); |
| 248 | if (p == -1) { |
| 249 | if (crop == 1) |
| 250 | D_2[(x + y * td->destbuf.linesize[0])*channels+z] = 16; |
| 251 | } else { |
| 252 | D_2[(x + y * td->destbuf.linesize[0])*channels+z] = (uint8_t)p; |
| 253 | } |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | return 1; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * transformPlanar: applies current transformation to frame |
| 263 | * |
| 264 | * Parameters: |
| 265 | * td: private data structure of this filter |
| 266 | * Return value: |
| 267 | * 0 for failture, 1 for success |
| 268 | * Preconditions: |
| 269 | * The frame must be in Planar format |
| 270 | */ |
| 271 | int _FLT(transformPlanar)(VSTransformData* td, VSTransform t) |
| 272 | { |
| 273 | int x = 0, y = 0; |
| 274 | uint8_t *dat_1, *dat_2; |
| 275 | char crop = td->conf.crop; |
| 276 | |
| 277 | if (t.alpha==0 && t.x==0 && t.y==0 && t.zoom == 0){ |
| 278 | if(vsFramesEqual(&td->src,&td->destbuf)) |
| 279 | return VS_OK; // noop |
| 280 | else { |
| 281 | vsFrameCopy(&td->destbuf, &td->src, &td->fiSrc); |
| 282 | return VS_OK; |
| 283 | } |
| 284 | } |
| 285 | int plane; |
| 286 | for(plane=0; plane< td->fiSrc.planes; plane++){ |
| 287 | dat_1 = td->src.data[plane]; |
| 288 | dat_2 = td->destbuf.data[plane]; |
| 289 | |
| 290 | int wsub = vsGetPlaneWidthSubS(&td->fiSrc,plane); |
| 291 | int hsub = vsGetPlaneHeightSubS(&td->fiSrc,plane); |
| 292 | float c_s_x = (td->fiSrc.width >> wsub)/2.0; |
| 293 | float c_s_y = (td->fiSrc.height >> hsub)/2.0; |
| 294 | float c_d_x = (td->fiDest.width >> wsub)/2.0; |
| 295 | float c_d_y = (td->fiDest.height>> hsub)/2.0; |
| 296 | uint8_t black = plane==0 ? 0 : 0x80; |
| 297 | |
| 298 | float z = 1.0-t.zoom/100; |
| 299 | float zcos_a = z*cos(-t.alpha); // scaled cos |
| 300 | float zsin_a = z*sin(-t.alpha); // scaled sin |
| 301 | float tx = t.x / (float)(1 << wsub); |
| 302 | float ty = t.y / (float)(1 << hsub); |
| 303 | |
| 304 | /* for each pixel in the destination image we calc the source |
| 305 | * coordinate and make an interpolation: |
| 306 | * p_d = c_d + M(p_s - c_s) + t |
| 307 | * where p are the points, c the center coordinate, |
| 308 | * _s source and _d destination, |
| 309 | * t the translation, and M the rotation and scaling matrix |
| 310 | * p_s = M^{-1}(p_d - c_d - t) + c_s |
| 311 | */ |
| 312 | int w = CHROMA_SIZE(td->fiDest.width,wsub); |
| 313 | int h = CHROMA_SIZE(td->fiDest.height,hsub); |
| 314 | int sw = CHROMA_SIZE(td->fiSrc.width,wsub); |
| 315 | int sh = CHROMA_SIZE(td->fiSrc.height,hsub); |
| 316 | for (x = 0; x < w; x++) { |
| 317 | for (y = 0; y < h; y++) { |
| 318 | float x_d1 = (x - c_d_x); |
| 319 | float y_d1 = (y - c_d_y); |
| 320 | float x_s = zcos_a * x_d1 |
| 321 | + zsin_a * y_d1 + c_s_x -tx; |
| 322 | float y_s = -zsin_a * x_d1 |
| 323 | + zcos_a * y_d1 + c_s_y -ty; |
| 324 | uint8_t *dest = &dat_2[x + y * td->destbuf.linesize[plane]]; |
| 325 | td->_FLT(interpolate)(dest, x_s, y_s, dat_1, td->src.linesize[plane], |
| 326 | sw, sh, crop ? black : *dest); |
| 327 | } |
| 328 | } |
| 329 | } |
| 330 | return VS_OK; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Local variables: |
| 335 | * c-file-style: "stroustrup" |
| 336 | * c-file-offsets: ((case-label . *) (statement-case-intro . *)) |
| 337 | * indent-tabs-mode: nil |
| 338 | * c-basic-offset: 2 t |
| 339 | * End: |
| 340 | * |
| 341 | * vim: expandtab shiftwidth=2: |
| 342 | */ |