CPC H04N 23/56 (2023.01) [G01B 11/22 (2013.01); G06T 7/50 (2017.01); H04N 23/71 (2023.01); H05B 45/32 (2020.01); G06T 2207/10048 (2013.01)] | 20 Claims |
1. An infrared imaging assembly to capture an infrared image of a scene, the infrared imaging assembly comprising:
an infrared-sensitive image sensor;
an irradiator comprising an array of individually addressable infrared-emitting LEDs, each infrared-emitting LED arranged to illuminate at least one image region of a plurality of image regions of the scene;
a driver configured to actuate the irradiator by applying a switching pulse train to each infrared-emitting LED;
an image analyzer configured to analyze a preliminary image of the scene irradiated by the irradiator to determine exposure levels for each of the plurality of image regions, the driver configured to use pulses of a preliminary switching pulse train to drive each infrared-emitting LED during a scan sequence in which the preliminary image is captured; and
an adjusting unit configured to adjust driving of each infrared-emitting LED based on the exposure levels to obtain a final image, the preliminary switching pulse train having a shorter duration than a final switching pulse train used to drive the infrared-emitting LED to obtain the final image, the pulses of the preliminary switching pulse train having a shorter pulse width than pulses of the final switching pulse train.
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