US 11,985,300 B2
Measurement of an image sensor point spread function (PSF)
Piotr Stec, Galway (IE)
Assigned to FotoNation Limited, (IE)
Filed by FotoNation Limited, Galway (IE)
Filed on Aug. 18, 2021, as Appl. No. 17/405,398.
Claims priority of provisional application 63/067,551, filed on Aug. 19, 2020.
Prior Publication US 2022/0060681 A1, Feb. 24, 2022
Int. Cl. H04N 17/02 (2006.01); G06T 7/80 (2017.01); H04N 17/00 (2006.01); H04N 23/80 (2023.01)
CPC H04N 17/002 (2013.01) [G06T 7/80 (2017.01); H04N 23/80 (2023.01); G06T 2207/20056 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of determining point spread function (PSF) of an image sensor for an imaging apparatus, the method comprising:
generating, by a laser light source, a laser signal;
directing the laser signal through a diffuser toward a pixel of the image sensor;
based on the laser signal, exciting the pixel of the image sensor to generate an image, wherein a frequency band of the excitation is beyond the image sensor's Nyquist frequency;
multiplying pixel intensity values of the image with a windowing function;
performing a fast Fourier transform of the multiplied pixel intensity values of the image; and
calculating the PSF via autocorrelation of the transformed pixel intensity values.