Patent ID: 11914036
Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A time-of-flight camera system comprising:
an illumination source;
an image sensor comprising one or more sensor pixels each comprising an in-pixel memory;
a logic subsystem; and
a memory comprising instructions executable by the logic subsystem to
operate the illumination source and the image sensor to control a plurality of integration cycles for a readout cycle, wherein during each integration cycle, the instructions are executable to
perform a plurality of pulse width modulated (PWM) illumination cycles, each PWM illumination cycle separated from one or more adjacent PWM illumination cycles by a non-illumination cycle,
temporally modulate the illumination source during each PWM illumination cycle to emit temporally modulated light, the temporally modulated light being modulated at different frequencies for at least two different PWM illumination cycles,
during each PWM illumination cycle, direct photocharge to the in-pixel memory for each pixel that is performing image integration, and
during each non-illumination cycle, conduct photocharge away from the in-pixel memory for each pixel that is performing image integration, and

during the readout cycle, for each pixel that performed image integration, read a charge stored in the in-pixel memory.