tree 2c8c948711d6cff17d9f1fdd6aea8a3324886ebb
parent bf733e6bcfa9599cc81451eb345ab623c1516841
author Neeraj Gadgil <neeraj.gadgil@ittiam.com> 1659689324 +0530
committer Neeraj Gadgil <neeraj.gadgil@ittiam.com> 1659706862 +0530

rtc: Adjust tune_thresh_based_on_qindex_window conservatively

Fixed visual artifacts in desktopqvga clip using source_sad in
prefer_larger_partition_blocks sf. The speed, BD-Rate impact:

 ---------------------------------------------------------
|cpu| Test set |Instr. Count|    BD-Rate Drop (%)         |
|   |          |Reduction(%)|avg. psnr |ovr. psnr|  ssim  |
 ---------------------------------------------------------
| 8 | rtc-derf |  -1.248    | -0.2538  | -0.2606 | -0.2099|
 ---------------------------------------------------------

The worst and best case quality impact is:
 ---------------------------------------------------------
|         Clip                 |     BD Rate Drop (%)     |
|                              |(-ve: Gain, +ve Loss)     |
|                             ----------------------------|
|                              |avg.PSNR |ovr.PSNR| SSIM  |
|---------------------------------------------------------|
|Best  | jimred_320_240        | -2.17  | -2.10  | -1.96  |
|      | desktop1_320_180      | -0.83  | -1.08  | -2.80  |
|---------------------------------------------------------|
|Worst | street180p            |  0.51  |  0.57  |  0.46  |
|      | apprtc_pixel3_320_240 | -0.08  |  0.25  |  0.95  |
 ---------------------------------------------------------
Other speeds and resolutions are not impacted.

STATS_CHANGED

Change-Id: Icc43160deafc823a0bc6f6fbea47c35f37d8ce9c