US 12,266,137 B2
Image quality calibration for multi-degree-of freedom actuator
Tim P. Johnson, Torrance, CA (US); Scott R. Foes, Torrance, CA (US); and Joseph J. Ichkhan, Redondo Beach, CA (US)
Assigned to Raytheon Company, Arlington, VA (US)
Filed by Raytheon Company, Arlington, VA (US)
Filed on Oct. 27, 2023, as Appl. No. 18/384,558.
Claims priority of provisional application 63/419,894, filed on Oct. 27, 2022.
Prior Publication US 2024/0153140 A1, May 9, 2024
Int. Cl. G06T 7/80 (2017.01); H04N 23/695 (2023.01)
CPC G06T 7/80 (2017.01) [H04N 23/695 (2023.01); G06T 2207/10032 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for image quality calibration of an optical system using a multi-degree-of freedom (DOF) compensator, the method comprising:
a) receiving a first plurality of images of a scene including a plurality of targets by the optical system with the compensator at an initial position;
b) selecting an initial pixel window of a first size around each of the plurality of targets in the first plurality of captured images, respectively;
c) measuring an initial ensquared energy (ES) in each of the initial pixel windows;
d) moving the compensator in a first DOF to a new position;
e) capturing a second plurality of images of the scene at the new position of the compensator;
f) repeating d to e for all of the multi-DOFs;
g) utilizing the measured ES in each of the pixel windows as a merit function for a damped least squares (DLS) optimization method to move the compensator in all of the multi-DOFs;
h) repeating c-g until a sum of ES in each of the pixel windows from all targets has reached a maximum;
i) moving the compensator to a position where the ES in each of the pixel windows from all targets has reached the maximum;
j) selecting a pixel window of a second size smaller than the first size; and
k) repeating c to j for a predetermined number of times to obtain the image quality calibration of the optical system.