Doom9's Forum - View Single Post

DTL · 13th October 2022, 17:16

Currently IVS-mask is to decrease level of details blurring on 'important' areas of frame while keeping degraining at no detailed areas good enough. As I see from latest tests the MAnalyse produces significantly different MVs with SAD and SSIM metrics at the non-detailed areas. So it may be additional method to create IVS-mask from even single pairs of frames search - it is faster in compare with many frames analysis for MVs difference for block. So in the new versions the MDegrainN may have 2 additional inputs of MVs clips and separate tr-value for this part of processing. Like mvmultivs2 and MPB_IVStr params. So the mvmulti clips may be created with much smaller tr and less CPU load, may be down to tr=1. Also it may help to reduce issue of current IVS-mask creation algorithm - after scene change it will not produce any good mask at about tr/2 or more number of frames.

MAnalyse with SSIM metric works about 2 times slower in compare with SAD metric even with AVX2 calculation of SSIM (getting sigmas and means in 16..32 bit integer subtraction/addition/multiplication and final processing in float32 including full precision square root). So it is good to decrease amount of processing with SSIM metric if possible for better performance.

13th October 2022, 17:16	#167 \| Link
DTL Registered User Join Date: Jul 2018 Posts: 1,069	Currently IVS-mask is to decrease level of details blurring on 'important' areas of frame while keeping degraining at no detailed areas good enough. As I see from latest tests the MAnalyse produces significantly different MVs with SAD and SSIM metrics at the non-detailed areas. So it may be additional method to create IVS-mask from even single pairs of frames search - it is faster in compare with many frames analysis for MVs difference for block. So in the new versions the MDegrainN may have 2 additional inputs of MVs clips and separate tr-value for this part of processing. Like mvmultivs2 and MPB_IVStr params. So the mvmulti clips may be created with much smaller tr and less CPU load, may be down to tr=1. Also it may help to reduce issue of current IVS-mask creation algorithm - after scene change it will not produce any good mask at about tr/2 or more number of frames. MAnalyse with SSIM metric works about 2 times slower in compare with SAD metric even with AVX2 calculation of SSIM (getting sigmas and means in 16..32 bit integer subtraction/addition/multiplication and final processing in float32 including full precision square root). So it is good to decrease amount of processing with SSIM metric if possible for better performance. Last edited by DTL; 13th October 2022 at 21:40.