Calibration circuitry and method for a time of flight imaging system

A time-of-flight, imaging system technology, applied in the components of TV system, radio wave measurement system, TV and other directions, can solve the problems of difficulty and complexity of small devices

Active Publication Date: 2016-07-13
OMNIVISION TECH INC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

A disadvantage of this triangulation technique is that it is difficult to create 3D images using small devices, because in order to create a 3D image, there must be a minimum

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  • Calibration circuitry and method for a time of flight imaging system
  • Calibration circuitry and method for a time of flight imaging system
  • Calibration circuitry and method for a time of flight imaging system

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Embodiment Construction

[0014] Methods and circuits for calibrating time-of-flight pixel units in time-of-flight imaging systems are disclosed. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein may be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.

[0015] Reference throughout this specification to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not nec...

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Abstract

The application relates to a calibration circuitry and method for a time of flight imaging system. The time of flight imaging system includes a light source coupled to emit light pulses to an object in response a light source modulation signal generated in response to a reference modulation signal. Each pixel cell of a time of flight pixel cell array is coupled to sense light pulses reflected from the object in response a pixel modulation signal. A programmable pixel delay line circuit is coupled to generate the pixel modulation signal with a variable pixel delay programmed in response to a pixel programming signal. A control circuit is coupled to receive pixel information from the time of flight pixel array representative of the sensed reflected light pulses. The control circuit is coupled to vary the pixel programming signal during a calibration mode to synchronize the light pulses emitted from the light source with the pulses of the pixel modulation signal.

Description

technical field [0001] The present invention relates to image sensors. In particular, embodiments of the invention relate to three-dimensional image sensors. Background technique [0002] As 3D applications become more popular in applications such as multimedia, gesture-based human-machine interfaces, automobiles, and the like, interest in three-dimensional (3D) cameras is also increasing. A typical passive way of creating a 3D image is to use multiple cameras to capture a stereoscopic image or images. Using the stereoscopic image, objects in the image can be triangulated to create a 3D image. A disadvantage of this triangulation technique is that it is difficult to create a 3D image using a small device because there must be a minimum separation distance between each camera in order to create a three-dimensional image. Additionally, this technique is complex and thus requires significant computer processing power in order to create 3D images in real time. [0003] For a...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N5/374G01S17/894
CPCG01S7/483G01S7/497G01S17/894G06F3/017
Inventor 郭健王睿代铁军
Owner OMNIVISION TECH INC
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