Trim 5 frames starting from 160-th frame and write to png sequence ffmpeg -pix_fmt yuv420p -s 1920x1088 -r 1 -i input_video.yuv -r 1 -ss 160 -frames 5 output_sequence_%d.png size of input video is 1920x1088, format YUV420 progressive. UPD: ffmpeg is renamed to avconv. Using it for trimming AVI video: avconv -ss 00:58:00 -t 00:59:30 -i ./video.avi frame_%05d.png UPD2: it seems ffmpeg is back.
I processed depth maps using avisynth 2.5.8 and I found out it causes color degradation I have a depth map (from http://vision.middlebury.edu/stereo/data/scenes2001/data/imagehtml/sawtooth.html) And two scripts1) just_show.avsv = ImageSource( "depth.jpg" ).Trim(0, -1) return v2) overlay.avs v = ImageSource( "depth.jpg" ).Trim(0, -1) return overlay( v, v, mode = "blend", opacity = 0.80) They have slightly different colors. just showoverlayOverlay has chroma componentThe cause was in wrong color conversion in avisynth 2.5.8. I downloaded AVS 2....
in cygwin: PATH=$PATH:~/your_path or PATH=~/your_path:$PATH Add path windows PATH=%PATH%;C:\Your_Path;
Never-Never-NEVER open file for reading until you think twice what mode (text/binary) of operation do you need!!
There are specific databases which were subjectively tested. Ans MOS was calculated for example http://www.ponomarenko.info/tid2008.htm you can download database and compare your metric to MOS by Spearman correlation
See good explanation is in Title: Handbook of image and video processing Author(s): Bovik A. (ed.) Series: Periodical: Publisher: Elsevier Academic Press Year: 2005 Edition: 2ed. Language: English Pages: 1429 ISBN: 9780121197926, 0121197921
Нужно будет тут записать как работает метрика SSIM по человечески
To replace new lines in word use “^13” whild-char. “^p” doesn’t work :(
Assume we have Visual Stusio solution for console that makes some video processing. The console takes two input videos and generates the third video: Console.exe --input1 video1.avi --input2 video2.avi --output result.aviWhile debugging we need to run console on several datasets. 1) dataset1 conststs of videos set1_video1.avi and set1_video2.avi 2) dataset2 conststs of videos set2_video1.avi and set2_video2.avi .... n) .... It seem rather convenient to distrubute videos between folders. One folder for each dataset....
Bjontegaard metric (BD-PSNR) describes the distance between two RD-curved. I is useful to determine how big is the gain between “before” and “after” versions. Or determine what curve is better if they have complex form (for example, intersecting). I found matlab script, that calculates BD-PSNR, but it was not correct. The limits of integration were wrong. Difference between two curves can be calculated only in the area of thein projections intersection....