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Functions | |
| void | initAexpCorr (void) |
| int | aexpCorr (int color, int frame, int target_frame) |
| P_AUTOEXP_OVEREXP_MAX - temporary. | |
| int aexpCorr | ( | int | color, | |
| int | frame, | |||
| int | target_frame | |||
| ) |
P_AUTOEXP_OVEREXP_MAX - temporary.
TODO: if there were no new histograms - just skip to the next frame TODO: Add errors until they are above threshold (simplified logariphm)? TODO: Add non-linear function to expand near-saturation area (and then experiment with such a function) TODO: Don't correct colors when large exposure changes were made TODO: fix exposure when the green is not the highest. Or is it a problem with white balance, not the AE? AE - when gain as above ~0x430/0x400 TODO: Maybe switch autoexposure to "color mode" if green is not highest?
lower byte
next byte
don't try to synchronize to availble histograms
autoexposure is turned off
too early to bother
======= 0 here
get (approximate if not updated) percentile for dim (1 scanline exposure) image -to use as a zero point exposure
measure
sets global hist_index, gamma_index
histogram is too old - try again
will request histogram for this frame
repeat up to 8 times trying to get a fresh histogram
sets global hist_index, gamma_index
histogram is too old - try again
will request histogram for this frame
calculate sensor level from gamma_level using gamma table whisth hash32 saved at hist_index
getPercentile() failed
overexposure recovery
global counter
NOTE: Maybe just dividing exposure by 2 /counter is enough?
no overexposition
get_imageParamsThatValid() failed
wrong/obsolete dim level - ignore it to avoid negatives)
*** more aggressive
Add some protection from autoexposure going crazy
for now treat as number of lines TODO: change to usec?
temporary limit
How many frames the exposure correction has to be the same sign before it will be applied (<128)
======= 1 here
try again next frame (extend in HDR)
too little error - no change in exposure
reset error accumulator
Now apply that new exposure ANd request
Definition at line 56 of file aexp_corr.c.
References aex_recover_cntr, DEFAULT_AE_PERIOD_CHANGE, DEFAULT_AE_PERIOD_NOCHANGE, fd_fparmsall, framePars, FRAMEPARS_SETFRAME, G_AE_INTEGERR, G_HIST_DIM_01, G_HIST_DIM_23, G_NEXT_AE_FRAME, gammaReverse(), get_imageParamsThatValid(), getPercentile(), GLOBALPARS, hist_index, histogram_cache, level, LSEEK_FRAME_WAIT_ABS, MDF1, MDF3, P_AE_PERIOD, P_AE_THRESH, P_AEXP_FRACPIX, P_AEXP_LEVEL, P_AUTOEXP_EXP_MAX, P_AUTOEXP_ON, P_VEXPOS, framepars_t::pars, PARS_FRAMES_MASK, poorLog(), SEEK_END, stderr, this_frame, and write.
Referenced by main().
| void initAexpCorr | ( | void | ) |
*************************************************************************** ! FILE NAME : aexp_corr.c ! DESCRIPTION: Autoexposure part of the autoexposure/white balance/hdr daemon ! Copyright (C) 2008 Elphel, Inc. ! -----------------------------------------------------------------------------** ! 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 3 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, see <http://www.gnu.org/licenses/>. ! -----------------------------------------------------------------------------** ! !
NOTE - autoexposure was stuck for a hours when I tried resetting frame number...
Definition at line 34 of file aexp_corr.c.
References G_NEXT_AE_FRAME, and GLOBALPARS.
Referenced by initParams().
1.5.1