US 12,462,352 B2
Method for thermal image processing
Thomas Winzell, Lund (SE); Lidia Gridneva, Lund (SE); and Jimmy Heimdal, Lund (SE)
Assigned to Axis AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Jun. 21, 2024, as Appl. No. 18/749,910.
Claims priority of application No. 23181427 (EP), filed on Jun. 26, 2023.
Prior Publication US 2024/0428382 A1, Dec. 26, 2024
Int. Cl. G06T 5/70 (2024.01); G06T 5/40 (2006.01); G06T 7/73 (2017.01)
CPC G06T 5/70 (2024.01) [G06T 5/40 (2013.01); G06T 7/73 (2017.01); G06T 2207/10048 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for thermal image processing, the method comprising:
obtaining a thermal image acquired by a thermal camera and depicting a scene;
obtaining a frequency distribution based on pixel intensities of the thermal image;
processing the frequency distribution to determine whether the frequency distribution comprises a peak, caused by a hot object in the scene, which is separated from a thermal background of the scene by more than an intensity threshold; and
in response to determining that the frequency distribution comprises the peak which is separated from the thermal background by more than the intensity threshold, processing the thermal image to suppress a ghost image of the hot object in the thermal image, wherein the ghost image is caused by internal reflections of radiation from the hot object in the thermal camera, and wherein the processing of the thermal image comprises:
estimating a location of ghost image pixels forming the ghost image; and
suppressing the ghost image in the thermal image by adjusting intensities of the ghost image pixels.