This program automates the detection of logos in video streams. It will create a PNG image of the logo and print the position and size in the video stream. The logo removal is done by passing these parameters to the ffmpeg.
The detection algorithm starts by getting equally spaced timestamps of the input video file (64 by default). Then from those timestamps it searches the first key frames and saves the Y plane of those frames (for YUV 4:2:0 and 4:2:2 encodings). To speed detection only the 4 corners of an image are saved while the middle bands are discarded. The percentage of these corners are configurable with switch options. To find the logo position all the saved frames are cross-correlated and the constant pixels will emerge. For static videos sometimes the detection fails and then it is better to apply first and edge detection algorithm (Canny) and cross-correlate the edges.
Video Delogo: Find the Logo Position and Size in a Video Stream v1.0 - Zelea
Usage: delogo [options] video_file
- -?,--help show options help
- -i,--info show video info only
- -y,--canny force canny edge detection for logo
- -2,--two_rectangles cover the logo with two overlaping rectangles
- -m,--removelogo generate a mask of the logo instead of a rectangle
- -r,--pixel_ratio switch to mask mode if pixel percentage inside the logo bounding box is bellow (default 0%)
- -a,--aggressive_crop crop video aggressively ignoring some percentage of non-black pixels
- -c,--corner fix logo corner [0-3] (NW,NE,SW,SE)
- -j,--jump_corner logo jumps from corner to corner
- -f,--frames number of frames to process (default 64)
- -W,--width_bands width percentage search band (default 35%)
- -H,--height_bands height percentage search band (default 18%)
- -b,--level_black maximum black level (default 23)
- -d,--level_delta maximum luminance distace for logo detection (default 65)
- -k,--border_black border thickness around logo (default 15)
- -z,--border_band additional border band (default 4)
- -t,--threshold canny edge detection threshold 0-255 (default 170)
- -s,--sigma canny sigma (default 1.2)
- -l,--tlow canny tlow (default 0.3)
- -h,--thigh canny thigh (default 0.8)
- -X,--save_as_pcx save images as PCX rather than PNG