The native resolution of an optical line scan camera is defined by the number of pixels – the row of photosensitive elements in the sensor line. Line scan cameras are available with more than 8000 pixels.
Optical resolution of Line Scan Cameras
The pixel resolution is defined by the pixel width w and the image scale β'
Also, to maintain the correct aspect ratio for an image, the pixel resolution p’‚ in the direction of the sensor X-axis must be identical to that in the direction of the transport Y-axis, perpendicular to the sensor. The resolution in the direction of transport is a function of transport speed and the line frequency of the camera .
An identical resolution in both the X and Y-axis
directions is an absolute prerequisite for the
accurate geometrical measurement of the surface characteristics of the test object. The optical resolution of the scanner system is often reported in dots per unit length, usually dots per inch or dpi.