Fast three-dimensional appearance measuring method and device

A three-dimensional topography and fast technology, applied in measurement devices, optical devices, image analysis, etc., can solve the problems of poor noise tolerance, high measurement environment and equipment requirements, and achieve improved projection speed, good generalization, and reliability. The effect of 3D optical measurement method

CN101482398BInactive Publication Date: 2011-03-30PEKING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a rapid three dimensional appearance measuring method and apparatus thereof. The method comprises the following steps: 1) coding the projection lines by computer and inputting the result into the projection equipments; 2) collecting the projection line images; 3) dividing out the projection lines in the demarcating image and the measuring image and determining the position of the center projection line; 4) recognizing the projection line code by using mode recognition method; 5) comparing the demarcating image and the measuring image to obtain height difference data of the corresponding points between the demarcating image and the measuring image; 6) adjusting the height difference data of the corresponding points of the demarcating image and the measuring image, and combining the height difference data of the projection equipments into the final three dimensional appearance data to abtain the three dimensional appearance measuring result. the multi-line projection coding method is a pseudorandom sequence coding of the space containing redundant codes; the constrained conditions is the single coding condition that the same coding of adjacent projection line appears only onec; the redundant code is time pseudorandom sequence coding, is used for verifying the correctness of the spatial pseudorandom sequence coding recognized in the step 4).
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Description

technical field

[0001] The invention relates to a machine vision method and device, in particular to a method and device for rapid three-dimensional shape measurement. Background technique

[0002] Three-dimensional object surface profile measurement is an important means to obtain the morphological characteristics of objects. It is not only of great significance in military, industrial and other fields, but also has broad application prospects in civilian fields such as medicine, health, art and entertainment. Optical non-contact 3D shape measurement has the advantages of full field, fast, high resolution and rapid data extraction, so it is widely used. At present, the commonly used optical non-contact 3D shape measurement methods include laser triangulation projection method, Moiré projection method and structured light method, etc. Among them, the structured light method can measure data in a short period of time by adding coding and covering the entire field of mode pro...

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Such as figure 1 As shown, a single set of the device of the present invention includes two or more projection devices 1 , an image acquisition device 2 , a reference plane 3 and a computer (not shown in the figure). The projection device 1 can be a common projector such as DLP, LCD, or a special-purpose laser projection device; the image acquisition device 2 is a camera for collecting static images or a video camera for collecting dynamic images; the reference plane 3 is arranged on the opposite side of the image acquisition device 2 of a white plane. The projection device 1 projects from different directions on the side of the measured object 4 to the measured object 4 respectively, which can eliminate shadows caused by single-side projection. The projection device 1 is connected to the computer, and through the control of the built-in soft...