Capturing images under coded illumination patterns to reduce effects of ambient lighting conditions

An imaging system comprising:

• a first illumination source controllable to radiate electromagnetic radiation at multiple wavelength ranges;
• a second illumination source disposed spatially separated from the first illumination source, the second illumination source controllable to radiate electromagnetic radiation at multiple wavelength ranges;
• and
• one or more processing devices configured to:
• receive, from a first sensor, during a first time period, information representing reflected light received from a target, wherein the target is illuminated by the first illumination source radiating electromagnetic radiation in a first wavelength range, wherein the first sensor comprises a red (R) or Blue (B) sensor of an RGB camera,
• receive, from a second sensor, during the first time period, information representing reflected light received from the target, wherein the target is illuminated by the second illumination source radiating electromagnetic radiation in a second wavelength range, which is at least partially non-overlapping with the first wavelength range, wherein the second sensor comprises a green (G) sensor of the RGB camera,
• capture a first image of the target by the first sensor during the first time period,
• capture a second image of the target by the second sensor, wherein the second image is captured concurrently to the first image, wherein the target is illuminated with a first coded illumination sequence radiated from the first illumination source and with a second coded illumination sequence radiated from the second illumination source, and wherein the first sensor is substantially insensitive to the second coded illumination sequence of the second illumination source, and
• generate, based at least on the information received from the first and second sensors, a first final image and a second final image by combining the first image and the second image, wherein reflections in the first final image due to the first and second illumination sources are removed by replacing pixel values from the first image corresponding to a first reflection of the first illumination source with pixel values from an analogous region in the second image, and wherein reflections in the second final image due to the first and second illumination sources are removed by replacing pixel values from the second image corresponding to a second reflection of the second illumination source with pixel values from an analogous region in the first image.

One or more machine-readable storage devices having encoded thereon computer readable instructions for causing one or more processing devices to perform operations comprising:

• receiving, from a first sensor, during a first time period, information representing reflected light received from a target, wherein the target is illuminated by a first illumination source radiating electromagnetic radiation in a first wavelength range, wherein the first sensor comprises a red (R) or Blue (B) sensor of an RGB camera;
• receiving, from a second sensor, during the first time period, information representing reflected light received from the target, wherein the target is illuminated by a second illumination source radiating electromagnetic radiation in a second wavelength range, wherein the second wavelength range is at least partially non-overlapping with the first wavelength range, and the second illumination source is spatially separated from the first illumination source, wherein the second sensor comprises a green (G) sensor of the RGB camera;
• and
• capturing a first image of the target by the first sensor during the first time period,
• capturing a second image of the target by the second sensor, wherein the second image is captured concurrently to the first image, wherein the target is illuminated with a first coded illumination sequence radiated from the first illumination source and with a second coded illumination sequence radiated from the second illumination source, and wherein the first sensor is substantially insensitive to the second coded illumination sequence of the second illumination source, and
• generating, based at least on the information received from the first and second sensors, a first final image and a second final image by combining the first image and the second image, wherein reflections in the first final image due to the first and second illumination sources are removed by replacing pixel values from the first image corresponding to a first reflection of the first illumination source with pixel values from an analogous region in the second image, and wherein reflections in the second final image due to the first and second illumination sources are removed by replacing pixel values from the second image corresponding to a second reflection of the second illumination source with pixel values from an analogous region in the first image.