公开(公告)号：US10777589B2

公开(公告)日：2020-09-15

申请号：US16285299

申请日：2019-02-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Subhash Chandra Sadhu ,  Vamshi Krishna Reddy Ani Reddy

IPC: H01L27/146 ,  H01L31/0232

Abstract: A time-of-flight camera calibration system includes a time-of-flight camera and a calibration processor. The calibration processor is coupled to the time-of-flight camera. The calibration processor is configured to receive an input phase image captured by the time-of-flight camera, and generate a blurred phase image by applying a low pass filter to the input phase image. The calibration processor is also configured to generate a crosstalk correction matrix based on the blurred phase image, and provide the crosstalk correction matrix to the time-of-flight camera.

公开(公告)号：US11543523B2

公开(公告)日：2023-01-03

申请号：US16235667

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Subhash Chandra Sadhu ,  Bharath Patil ,  Nithin Jose ,  Shubham Agrawal

IPC: G01S17/10 ,  G01S17/89 ,  G06T7/521 ,  G01S17/08

Abstract: A time of flight (ToF) system includes a light source, a photosensor, a signal generator and a processor. The signal generator outputs a reference signal corresponding to a modulation function for modulated light and a modified transmitted light signal corresponding to a phase shift of the reference signal. The light source outputs the modified transmitted light signal and pixels in the photosensor receives its reflections off the scene. The reference signal is applied to the pixels and the processor determines a depth map for the scene based on values recorded by the pixels. In some examples, the phase shift is implemented using a phase locked loop controller. One or more component phases of the phase shift and an exposure time for each component phase are determined and output by the phase locked loop controller.