1.1 Technical Specification VC nano 3D-Z
1.1.1 Framerate calculation
The framerate can be calculated by following these subcalculations:
Calculate the time for a video line: TLine = HMAX*13.468 ns.
Calculate the time for storing the captured image: TCapt = (DY + 33 + FPGADelay)*TLine + 3.3us.
Calculate the total time: TTotal = ShutterTime + TCapt.
FPGADelay in NrOfProcessingLines, between 7 and 38, depending on the filter configuration; main impact has the bgSubKy setting (see the libvclinux documentation).
HMAX vs. DX
DX | HMAX | TLine (us) |
|---|---|---|
1408 | 370 | 4.983 |
1344 | 350 | 4.713 |
1280 | 330 | 4.444 |
1216 | 320 | 4.310 |
1152 | 300 | 4.040 |
1088 | 290 | 3.906 |
1024 | 270 | 3.636 |
960 | 250 | 3.367 |
896 | 240 | 3.232 |
640 | 240 | 3.232 |
320 | 240 | 3.232 |
The following tables show some examples.
frame time (ms) at NrOfProcessingLines=7, shutter=1us
DY/DX | 1408 | 1344 | 1280 | 1216 | 1152 | 1088 | 1024 | 960 | 896 | 640 | 320 |
|---|---|---|---|---|---|---|---|---|---|---|---|
1080 | 5.584 | 5.283 | 4.981 | 4.830 | 4.529 | 4.378 | 4.076 | 3.774 | 3.623 | 3.623 | 3.623 |
1024 | 5.305 | 5.019 | 4.732 | 4.589 | 4.302 | 4.159 | 3.872 | 3.586 | 3.442 | 3.442 | 3.442 |
960 | 4.986 | 4.717 | 4.448 | 4.313 | 4.044 | 3.909 | 3.640 | 3.370 | 3.236 | 3.236 | 3.236 |
800 | 4.189 | 3.963 | 3.737 | 3.623 | 3.397 | 3.284 | 3.058 | 2.832 | 2.718 | 2.718 | 2.718 |
512 | 2.754 | 2.605 | 2.457 | 2.382 | 2.234 | 2.159 | 2.011 | 1.862 | 1.788 | 1.788 | 1.788 |
256 | 1.478 | 1.399 | 1.319 | 1.279 | 1.199 | 1.159 | 1.080 | 1.000 | 0.960 | 0.960 | 0.960 |
128 | 0.840 | 0.795 | 0.750 | 0.727 | 0.682 | 0.659 | 0.614 | 0.569 | 0.546 | 0.546 | 0.546 |
frame time (ms) at NrOfProcessingLines=38, shutter=1us
DY/DX | 1408 | 1344 | 1280 | 1216 | 1152 | 1088 | 1024 | 960 | 896 | 640 | 320 |
|---|---|---|---|---|---|---|---|---|---|---|---|
1080 | 5.739 | 5.429 | 5.119 | 4.964 | 4.654 | 4.499 | 4.189 | 3.879 | 3.724 | 3.724 | 3.724 |
1024 | 5.460 | 5.165 | 4.870 | 4.722 | 4.428 | 4.280 | 3.985 | 3.690 | 3.543 | 3.543 | 3.543 |
960 | 5.141 | 4.863 | 4.586 | 4.447 | 4.169 | 4.030 | 3.752 | 3.475 | 3.336 | 3.336 | 3.336 |
800 | 4.344 | 4.109 | 3.874 | 3.757 | 3.522 | 3.405 | 3.171 | 2.936 | 2.819 | 2.819 | 2.819 |
512 | 2.908 | 2.751 | 2.594 | 2.516 | 2.359 | 2.280 | 2.123 | 1.966 | 1.888 | 1.888 | 1.888 |
256 | 1.633 | 1.545 | 1.457 | 1.413 | 1.325 | 1.280 | 1.192 | 1.104 | 1.060 | 1.060 | 1.060 |
128 | 0.995 | 0.941 | 0.888 | 0.861 | 0.807 | 0.781 | 0.727 | 0.673 | 0.647 | 0.647 | 0.647 |
maximum frame rate (fps) at NrOfProcessingLines=7, shutter=1us
DY/DX | 1408 | 1344 | 1280 | 1216 | 1152 | 1088 | 1024 | 960 | 896 | 640 | 320 |
|---|---|---|---|---|---|---|---|---|---|---|---|
1080 | 179 | 189 | 201 | 207 | 221 | 228 | 245 | 265 | 276 | 276 | 276 |
1024 | 188 | 199 | 211 | 218 | 232 | 240 | 258 | 279 | 290 | 290 | 290 |
960 | 201 | 212 | 225 | 232 | 247 | 256 | 275 | 297 | 309 | 309 | 309 |
800 | 239 | 252 | 268 | 276 | 294 | 304 | 327 | 353 | 368 | 368 | 368 |
512 | 363 | 384 | 407 | 420 | 448 | 463 | 497 | 537 | 559 | 559 | 559 |
256 | 676 | 715 | 758 | 782 | 834 | 863 | 926 | 1000 | 1042 | 1042 | 1042 |
128 | 1190 | 1258 | 1333 | 1375 | 1466 | 1516 | 1628 | 1758 | 1830 | 1830 | 1830 |
maximum frame rate (fps) at NrOfProcessingLines=38, shutter=1us
DY/DX | 1408 | 1344 | 1280 | 1216 | 1152 | 1088 | 1024 | 960 | 896 | 640 | 320 |
|---|---|---|---|---|---|---|---|---|---|---|---|
1080 | 174 | 184 | 195 | 201 | 215 | 222 | 239 | 258 | 269 | 269 | 269 |
1024 | 183 | 194 | 205 | 212 | 226 | 234 | 251 | 271 | 282 | 282 | 282 |
960 | 195 | 206 | 218 | 225 | 240 | 248 | 266 | 288 | 300 | 300 | 300 |
800 | 230 | 243 | 258 | 266 | 284 | 294 | 315 | 341 | 355 | 355 | 355 |
512 | 344 | 363 | 385 | 397 | 424 | 439 | 471 | 509 | 530 | 530 | 530 |
256 | 612 | 647 | 687 | 708 | 755 | 781 | 839 | 906 | 943 | 943 | 943 |
128 | 1005 | 1062 | 1126 | 1162 | 1239 | 1281 | 1376 | 1485 | 1547 | 1547 | 1547 |
The measurements were done without any other CPU load.
Parallel image processing tasks may lead to a lower framerate.These values are only reachable if image capturing is deactivated.