The advantages of machine vision inspection system mainly manifest in non-contact inspection measurement,long-time stable work and so on,use machine vision solution will save a huge amount of labor resources and bring considerable interest for company,as a result,it is more and more widely used in every field.

Machine vision system has measuring capacity,it can automatically measure the external dimension of the products,such as contour,aperture,height,area and other dimensions measurement.Dimensions Measurement is the undispensable procedure in production process and quality inspection after product production,the machine vision has its unique technology advantage in dimension measurement.

For example,the non-contact measuring method can not only avoid damage of measuring object but also be fit for the untouchable situation such as high temperature,high pressure,fluid,dangerous environment and etc;Meanwhile,machine vision system can measure several dimensions simultanously to achieve fast completement of measuring tasks,it is suitable for on-line measuring;besides,as for micro dimension measurement is the strong point of machine vision system,it can magnify the measuring object with high-magnification lens to make the measurement accuracy to micron level or smaller.

Machine vision is based on relative measuring method,it can infer to the object dimension through tracing,magnification calibration,automatic tracing-edge.In precision measurement,35* of magnification is required to get micron level accuracy,at this time,the line width of vision is less than 5mm,as for object dimension above 5mm,the combination of shift analytical reading and window measuring is required to finish the measuring process.

As for the accuracy measurement of micro dimension,machine vision system can be adpoted with high-magnification industrial lens or microscopy lens,machine vision system can be applied to all fields ranging from tiny biological cell diameter,quantity to the small assembly gaps and to relatively small mechanical spare parts,electronic producs dimension measurement.

Although there are many ways to realize dimension measurement,most measurement perform not so good in repeatability,high efficiency and robustness.The fact manifest that,the dimension measurement based on machine vision technology has good continuity and high accuracy,it significantly improved the real-time and accuracy of industry and boost the production efficiency and product quality control.