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Imaging apparatus and solid-state image element used for same

By modulating the period, length and sequence of the luminescence and exposure signals in the TOF camera, the problem of the inability to homogenize the interference light components in the TOF camera is solved, achieving high-precision ranging and maintaining a high frame rate.

Active Publication Date: 2018-06-08
NUVOTON TECH CORP JAPAN NAGAOKAKYO CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, even if the difference calculation included in the distance measurement calculation is performed, the influence of interference light cannot be eliminated, and a distance measurement error will occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] figure 1 It is a functional block diagram showing an example of a schematic configuration of the imaging device (distance measuring imaging device) according to the first embodiment. The imaging device 1 shown in the figure measures the distance to the subject (or senses the subject) by emitting light and receiving reflected light from the subject. Furthermore, the imaging device 1 includes a light source unit 11 , a light receiving unit 12 , a control unit 13 , and a TOF calculation unit 14 . Also shown in this figure is an object OB whose distance to the imaging device 1 is measured (sensed) by the imaging device 1 .

[0039] The light source unit 11 is a light source that irradiates light (irradiation light, pulsed light, light emission signal) at a timing indicated by a light emission control signal. In the present embodiment, the light source unit 11 irradiates the subject OB with light at the timing of receiving the light emission control signal generated by the...

Embodiment approach 2

[0087] Hereinafter, the imaging device according to Embodiment 2 and the configuration and operation of a solid-state imaging device used therein will be described focusing on differences from Embodiment 1 with reference to the drawings.

[0088] Figure 7 It is a diagram showing the sequence of light emission exposure timings of the imaging device according to the second embodiment. Figure 7 (a) shows the timing of the light emission control signal and the exposure control signal in the light emission exposure period. In addition, the period (T A OFF) is fixed.

[0089] In this embodiment, the control unit 13 outputs a light emission control signal that modulates the period (Duty) of the light emission and exposure states while maintaining the phase relationship between the light emission signal and the exposure control signal during A0, A1, and A2 light emission and exposure periods. and exposure control signals.

[0090] Figure 7 (b) is an example of the operation of...

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PUM

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Abstract

An imaging apparatus (1) measures a distance to an object (OB) by irradiating the object with a light to receive a reflected light therefrom. The imaging apparatus (1) comprises: a control unit (13) that outputs a light emission control signal and an exposure control signal; a light source unit (11) that performs light irradiation at the timing of the light emission control signal; a light receiving unit (12) that is exposed by the reflected light from the object irradiated with the light at a plurality of different timings by means of the exposure control signal, and that outputs a pluralityof exposure signals generated by the exposure at the plurality of different timings; and a calculation unit that calculates the distance by using the plurality of exposure signals as inputs. The control unit (13) outputs the light emission control signal and the exposure control signal for adding modulation to at least the length and / or the repetition order of a light emission period and an exposure period.

Description

technical field [0001] The present invention relates to an imaging device and a solid-state imaging device used therein. Background technique [0002] In TOF (Time Of Flight: time of flight) ranging calculation, at least two or more exposure signals are obtained for the reflected light from the subject, and the time difference between light emission and light reception is calculated based on the obtained exposure signal amount or The phase difference (the time required for light to go back and forth to the target object) is used to perform distance measurement calculations. [0003] In addition, the distance measurement calculation usually includes a differential calculation to suppress the influence of the background light that illuminates the subject with a predetermined amount of light during the exposure period, such as sunlight, by canceling the difference. Or the light incident on the imaging device (TOF camera). [0004] However, when there are multiple TOF cameras,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/10G01S17/89G01C3/06G01S7/4865G01S17/894
CPCG01C3/06G01S17/10G01S7/4865G01S17/894H04N23/72H04N23/73H04N23/74H04N25/59G06T7/514
Owner NUVOTON TECH CORP JAPAN NAGAOKAKYO CITY