Multiple patterns in time-of-flight camera apparatus

A computer system for compensating for light reflected from non-uniform targets, comprising:

• one or more processors;
• and
• one or more computer-readable media having stored thereon executable instructions that when executed by the one or more processors configure the computer system to perform at least the following:
• illuminate, with an illumination unit, a target, wherein:
• during a first frame, the illumination unit is configured to project a uniform pattern onto the target, and
• during a second frame, the illumination unit is configured to project a high spatial-frequency pattern onto the target in such a way as to redistribute spectral energy to higher frequencies;
• acquire, with a sensor unit, first light data reflected from the target within the first frame and second light data reflected from the target within the second frame;
• and
• calculate, with the one or more processors, normalized light data by dividing, within the spatial domain, the second light data by the first 4 light data.

A time-of-flight camera apparatus configured to compensate for multipath interference on non-uniform targets, the apparatus comprising:

• an illumination unit for illuminating a target with a light source, wherein:
• during a first frame, the illumination unit is configured to project no light, and
• during a second frame, the illumination unit is configured to project a high spatial-frequency pattern onto the target in such a way as to redistribute spectral energy to higher frequencies;
• a sensor unit for acquiring first light data reflected from the target using ambient illumination from the scene within the first frame and second light data reflected from the target within the second frame;
• and
• a processing unit for processing the light data, wherein:
• the processing unit is configured to calculate normalized light data by dividing, within the spatial domain, the second light data by the first light data, followed by a high-pass or band-pass filter.