Method for measuring distance based on single image

A technology of distance measurement and single image, which is applied in the field of distance measurement based on single image, which can solve the problems of not being able to use camera equipment with variable focal length and large amount of calculation, and achieve the effect of fast speed and small amount of calculation

Inactive Publication Date: 2009-09-30
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The disadvantages of this method are: 1. It is only suitable for lenses with a fixed focal length, and cannot be applied to camera equipment with a variable focal length.
2. Each image area needs to be Fourier transformed and multiplied b

Method used

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  • Method for measuring distance based on single image
  • Method for measuring distance based on single image
  • Method for measuring distance based on single image

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Embodiment Construction

[0019] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0020] This embodiment uses a single defocused image, extracts the blurred edge in the image, measures the approximate value of the blurred edge width and the gray level difference on both sides of the blurred edge, and uses the corresponding relationship between the two and the distance information, focal length, and aperture diameter to train the BP neural network. Network, and then use the trained BP neural network to obtain distance information.

[0021] This embodiment includes the following steps:

[0022] In the first step, the location of blurred edges in the image is dete...

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Abstract

The invention relates to a method for measuring the distance based on a single image in the field of application software of photographic equipment. The method comprises the following steps: using a single defocus image to extract a fuzzy edge in the image and measure an approximate value of the width of the fuzzy edge and the gray scale difference of two sides of the fuzzy edge; training a BP neural network by using the corresponding relation of distance information of the approximate value and the gray scale difference, the focal distance and the aperture diameter; and calculating the distance information by using the well-trained BP neural network. The method can be applied to equipment with variable focal distance and aperture, the measurement of the distance only needs one defocus image, the calculation amount is not large, and the speed is quicker.

Description

technical field [0001] The present invention relates to a distance measuring method in the technical field of photography equipment, in particular to a distance measuring method based on a single image. Background technique [0002] The distance information of the object in the image is the distance from the captured object to the lens. It is very important to measure the distance information in the fields related to machine vision such as automatic focusing and three-dimensional reconstruction. Distance measurement methods can generally be divided into active and passive methods. Active methods include infrared ranging method, structured light method, moiré fringe method, etc. Passive methods include mobile ranging, zooming, and defocus ranging. The advantages of the active method are high precision and strong anti-interference ability, but it uses the sending and receiving of light waves for distance measurement, which requires additional equipment and high cost. The ac...

Claims

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Application Information

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IPC IPC(8): G01C11/00G06N3/02
Inventor 杨锟诚赵群飞冶建科涂意韩静亮
Owner SHANGHAI JIAO TONG UNIV
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