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MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > General Topics > Line-Scan Inspection Topics > Basic Resolution Issues > Axial Resolution

Axial Resolution

The downweb resolution of the image system is determined by the distance between two adjacent pixels on the inspected web in the downweb direction . Let us call this distance the "line pitch".

Contrary to the crossweb resolution, the downweb resolution is not dependent on the CCD sensor geometry nor on the optical setup.

The downweb resolution corresponds to the gap between two successively scanned lines.

The time between two video line readout processes is the line period. Considering the motion speed of the web, the distance traveled by the web during one line period is easily computed. This distance is the line pitch. It purely reflects the downweb resolution.

or equivalently

For instance, consider a camera working at the line frequency of 1 kHz. The line period is 1 ms.

Consider that the transport mechanical system moves the web at 50 cm/s.

In this situation, the downweb resolution, i.e. the line pitch, is 0.5 mm.