US 12,143,563 B2
Scaling factor detection for compressed images and videos
Vladimir Sireaev, Waterloo (CA); Jiheng Wang, Waterloo (CA); and Ahmed Badr, Waterloo (CA)
Assigned to IMAX CORPORATION, Mississauga (CA)
Filed by IMAX CORPORATION, Mississauga (CA)
Filed on Jun. 23, 2021, as Appl. No. 17/355,645.
Claims priority of provisional application 63/042,705, filed on Jun. 23, 2020.
Prior Publication US 2021/0400256 A1, Dec. 23, 2021
Int. Cl. H04N 17/00 (2006.01); H04N 19/154 (2014.01); H04N 19/33 (2014.01); H04N 19/587 (2014.01); H04N 19/625 (2014.01); H04N 21/234 (2011.01)
CPC H04N 17/004 (2013.01) [H04N 19/154 (2014.11); H04N 19/33 (2014.11); H04N 19/587 (2014.11); H04N 19/625 (2014.11); H04N 21/23418 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method for detecting scaling of compressed videos or images, comprising:
applying a frequency domain transformation along both horizontal and vertical directions of input video or images to generate frequency domain data, the input video or images having been scaled up from an original resolution to a scaled resolution greater than the original resolution;
computing statistics in the frequency domain data for each of the horizontal and vertical directions to extract features;
modeling the features to scores along each of the horizontal and vertical directions; and
identifying the original resolution of the input video or images in the horizontal and vertical directions according to the scores.