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US 7,733,503 B2Granted
Method and system for optical measurement of the shape of an article
AssigneeMapvision Oy Ltd.
InventorsMikko Himmi, Mikko Järvi, Antti Knuuttila
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AssigneeMapvision Oy Ltd.
InventorsMikko Himmi, Mikko Järvi, Antti Knuuttila
Estimating the term…
The present invention relates to a method and system for measuring articles made of a material that is difficult to measure, such as glass. In the system, an elastic film (19) is arranged on top of an article (110). A number of measurement points have been arranged on the film that are imaged using a machine vision system. The location of the measurement points imaged are calculated with respect to one another, and based on this, the shape of the article can be measured.
A method for measuring the shape of an article, in which method at least two cameras take images of the article to determine the location of measurement points arranged on the surface of the article, wherein the method comprises the steps of:
A system for measuring the shape of an article, the system comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
For measuring contours or curvatures: using a plurality of fixed, simultaneously operating transducers
Measuring arrangements characterised by the use of optical techniques: for measuring contours or curvatures
Interpretation of pictures: by comparison of two or more pictures of the same area
Characterised by the material or shape of the object to be examined: inspecting transparent materials or objects, e.g. windscreens
Term ended 31 Aug 2026 (estimated)
This application is a 371 of PCT/FI2005/000493 filed on Nov. 21, 2005, published on Jun. 8, 2006 under publication number WO 2006/058954 A1 and claims priority benefits of Finnish Patent Application No. 20041545 filed Nov. 30, 2004, the disclosure of which is hereby incorporated by reference.
The present invention relates to machine vision systems and measurement of articles in quality control. In particular, the invention relates to the measurement of mirror-like and transparent articles that are difficult to measure.
The present invention relates to machine vision systems and measurement of articles in quality control. In particular, the invention relates to the measurement of surfaces that are difficult to measure, including mirror and glass surfaces. Surfaces of this kind include automotive glasses that reflect light very poorly.
FIG. 1 represents one system in accordance with the invention shown in the initial state of preparing the measurement;
FIG. 2 represents one system in accordance with the invention shown in the intermediate phase of preparing the measurement;
FIG. 3 represents one method in accordance with the invention shown in the measurement standby state;
The present invention relates to machine vision systems and measurement of articles in quality control. In particular, the invention relates to the measurement of surfaces that are difficult to measure, such as mirror and glass surfaces. Surfaces of this kind include automotive windscreens that reflect light very poorly. FIGS. 1-3 describe one preferred embodiment of the invention, as well as the phases of utilising the embodiment. The reference numerals used in FIGS. 1-3 correspond to each other.
The system as shown in FIGS. 1-3 includes at least two cameras 10 and 11, as well as a central processing unit arranged to calculate the actual measurement results from the views perceived by the cameras. As the camera and central processing unit part used in the system of the invention one can use a conventional machine vision system that is obvious to a person skilled in the art.
Further, the system comprises an article being measured 110, which is placed on a measurement support. All suitable measurement supports may be suitable for use as a measurement support, and are obvious to a person skilled in the art. For example in the case of a windscreen, the windscreen is placed on the measurement support using the same spots by which the windscreen is attached to the car. Due to this, the measurement support is selected based on the article being measured.