Fast three-dimensional appearance measuring method and device

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).

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...

AI Technical Summary

Problems solved by technology

Their disadvantage is that the coding method of temporal neighborhood uses multiple projection modes and can only measure static objects; the coding method of spatial neighborhood generally uses one projection mode, but a certain point on the mode needs to rely on its own information and spatially adjacent The point information is encoded, that is, there is a problem of matching ambiguity; although the direct encoding method directly uses the information of the point itself for encoding, it has high requirements for the measurement environment and equipment, and has poor tolerance to noise, and it is also sensitive to the surface of the object. very demanding

Images