Square pixel tool allows us to optimize scanning speed of a line-scan camera system to assure identical true dimensions of image pixels in direction of movement and across the table/belt.


It assumes that a structured pattern is placed on the stage table and its start and end positions are fixed in the Stage panel (using the controls for white reference).


Starting the square pixel tool

When the start and end positions of the structured pattern are adjusted in the Stage panel, press the Scan button.


Square pixel tool feedback

In the screenshot below, you can see that our stage speed was set to 32 mm/sec . The acquired structured pattern image shows significant distortion of the circle shapes. The estimated excenicity is displayed at and the proposed solutions in terms of optimal stage speed or camera frame rate at.


The user needs to choose the desired solution and explicitly confirm it by pressing the Apply button.



Confirming the correctness of the solution found.

When re-running the tool once more, we can observe (below), that the speed was changed to 17 mm/sec , which leads to proper circular shapes of the scanned pattern . The newly estimated excentricity is now close to 1.0. We may either press Cancel or simply leave the Square pixels tool to keep this setting.



TIP Should the square tool not find the desired solution, it may be due to blur, low scan resolution or its inability to segment the structure pattern bar from the background. In such cases, you may use any other circle pattern printed in higher resolution.