Optoelectronic modules for distance measurements and/or multi-dimensional imaging
The present disclosure describes optoelectronic modules that, in some implementations, address the need to combine precise measurements of scenes over a range of near and far distances. For example, an optoelectronic module can include a light emitter operable to direct modulated structured light onto a scene. The module includes an imager to receive reflected light signals from the scene. The imager includes demodulation pixels operable to provide amplitude and phase information based on the reflected light signals. Various techniques can be used to derive distance or three-dimensional information about the scene based on the signals from the pixels.
1. An optoelectronic module comprising:
a light emitter operable to direct modulated structured light onto a scene; and
an imager to receive reflected light signals from the scene, the imager comprising a plurality of demodulation pixels operable to provide amplitude and phase information based on the reflected light signals, wherein at least some of the demodulation pixels are binned together in an N×M array of pixels, where each of N and M is ≥2, so that output signals from the binned demodulation pixels collectively provide at least one of the amplitude or phase information.
2. The optoelectronic module of claim 1 operable for dynamic binning in which a number of the demodulation pixels binned together varies over time.
3. The optoelectronic module of claim 1 wherein the light emitter is operable to direct modulated structured light at different modulation frequencies.
4. The optoelectronic module of claim 1 wherein the light emitter is operable to direct different modulated structured light patterns onto the scene at different times.
5. The method of claim 1 including dynamically binning the demodulation pixels such that a number of the demodulation pixels binned together varies over time.
6. A method of obtaining distance or three-dimensional data of a scene, the method comprising:
directing modulated structured light onto the scene;
sensing, by an imager, reflected light signals from the scene, the imager including a plurality of demodulation pixels, wherein at least some of the demodulation pixels are binned together in an N×M array of pixels, where each of N and M is ≥2, so that signals generated by the binned demodulation pixels collectively provide at least one selected from a group consisting of amplitude and phase information; and
deriving the at least one selected from the group consisting of amplitude and phase information from the signals generated by the demodulation pixels.
7. The method of claim 6 including directing onto the scene modulated structured light of a first modulation frequency during a first time period, and directing onto the scene modulated structured light of a second modulation frequency during a different second time period.
8. The method of claim 6 including deriving the distance or three-dimensional data of the scene from at least one of the amplitude or phase information.
9. A method of obtaining distance or three-dimensional data of a scene, the method comprising:
directing a respective modulated structured light pattern onto the scene at different times, wherein the modulated structured light pattern directed at a particular time differs from at least some of the modulated structured light patterns directed at other times;
sensing, by an imager, reflected light signals from the scene during the different time frames, the imager including a plurality of demodulation pixels; and
deriving distance or three-dimensional information about the scene based on signals from the demodulation pixels.
10. The method of claim 9 including deriving the distance or three-dimensional information using one or more of the following: (i) distortion between illuminated pixels of the imager; (ii) triangulation; or (iii) a time of flight technique.