Does not require new investment in measuring equipment
Allows the implementation of different standards for measuring quality
Accurately defines distortion at any point of the glass
Eliminates subjectivity of the personnel during the measurement process
Implemented PDM system manages measurement results and supporting documents

Image Pre-Processing

For each test, TOPINS requires two images: one image with a clear view of the grid board (Background Grid Picture), and one or more images with a view of the same board as seen through a transparency (Foreground Glass Picture). Because of this, all Foreground Glass Pictures used in a single test share the same Background Grid Picture.

Preprocessing of a Background Grid Picture needs to be done only once per test, but the procedure needs to be repeated separately for each transparency. In order to avoid any image imperfection, TOPINS has dedicated tools to correct it – Sensitivity Threshold and Minimum Length.

image008Sensitivity threshold parameter-  the effects of changing

During the PREPROCESSING stage, TOPINS analyzes the image of the reference grid and an image of the reference grid as seen through the examined transparency, extracts the locations of the lines on the grid, and creates internal vectorization interpretations of them. With a clear view of the grid, those vectors will be almost straight lines. When the grid is viewed through a transparency, those vectors will usually be distorted in some zones.

Image before Pre-Processing
Image after Pre-Processing 


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