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Distance measurement device and distance measurement method

A distance and measurement technology, applied in the field of distance measurement devices, can solve problems such as insufficient depth of field, difficulty in distance measurement, and difficulty in DFD application

Inactive Publication Date: 2015-06-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] According to Equation 1 and Equation 2, it can be seen that the smaller the change of PSF at different focus positions, the greater the difference between photographic images I and I 2 The smaller the difference, it is difficult to find the subject distance d
That is, the deeper the depth of field, the more difficult it is to measure the distance by DFD
Especially when the focal length of the lens is short, even if the aperture is opened to the maximum, the depth of field cannot be shallow enough. It can be said that the application of DFD is inherently difficult

Method used

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  • Distance measurement device and distance measurement method
  • Distance measurement device and distance measurement method
  • Distance measurement device and distance measurement method

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Embodiment approach 1

[0054] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a block diagram showing the functional configuration of the distance measuring device according to Embodiment 1 of the present invention.

[0055] The distance measurement device 10 has an imaging unit 12 , a frame memory 14 , a distance measurement unit 16 , and a control unit 18 .

[0056] The imaging unit 12 includes an imaging element 20 , a diffractive optical element 24 , an optical system 22 , an optical filter 26 , and an actuator 28 , and the imaging unit 12 captures a subject image and outputs the image.

[0057] The imaging element 20 captures an image and is configured using a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

[0058] The diffractive optical element 24 diffracts the subject image. The material of the diffractive optical element 24 is not particularly limited, but a material such as transparent glass tha...

Embodiment approach 2

[0103] The distance measuring device according to Embodiment 2 of the present invention has a structure capable of maintaining the intervals of diffraction images uniformly in the diffraction direction. Specifically, the diffractive optical element 24 has a curved shape. The other components are the same as those in Embodiment 1. The reason for adopting such a structure will be described below.

[0104] exist figure 2 and image 3 Consider the case where the subject o is on the optical axis. In contrast, consider the Figure 8 Shown is a case where the subject o is located at the position of the angle of view θ. and figure 2 and image 3 Similarly, among the light emitted from the object o, the light incident on the diffractive optical element G ( 24 ) at a specific angle is bent by diffraction, and then enters the imaging surface I through the pinhole P. At this time, the distance d' between the position where a diffraction image can be formed on the imaging surface...

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Abstract

A distance measurement apparatus includes: an imaging device which captures an image; a diffractive optical device which diffracts a subject image; an optical system which forms, on the imaging device, the image from the subject image diffracted by the diffractive optical device; and a distance measurement unit which measures a distance to a subject using the image captured by the imaging device. The distance measurement unit measures the distance to the subject based on an interval between diffraction figures of the subject image which are created by the diffractive optical device. The interval is on the image captured by the imaging device.

Description

technical field [0001] The present invention relates to a distance measuring device for measuring the depth of a scene based on a plurality of images captured from one viewpoint. Background technique [0002] Various methods have been proposed to measure the depth of a certain three-dimensional scene, that is, the distance to each subject, in a non-contact manner. These methods are roughly divided into active methods and passive methods. The active method is to irradiate the subject with infrared rays, ultrasonic waves, or laser beams, etc., and calculate the distance based on the time until the reflected wave returns or the angle of the reflected wave. The passive method is a method of calculating the distance from the image of the subject. Especially in the case of calculating a distance using a camera, a passive method that does not require a device for irradiating infrared rays or the like is widely used. [0003] Many passive methods have been proposed, one of which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C3/06G02B5/18G02B5/20G02B7/28G03B13/36H04N5/232
CPCG01S11/12G01C3/06H04N23/67
Inventor 木村雅之
Owner PANASONIC CORP