VideoMTF Image Analysis Module

The VideoMTF ® Image Analysis Module is used in conjunction with a two-dimensional imager to provide real-time measurement of MTF. The VideoMTF ® module can be configured for use with most industry standard video format cameras to provide high-speed laboratory quality measurement  capabilities. While typically used in the visible wavelength range, there are the image analyzers for the near-infrared, mid-wave infrared, and longwave infrared. A Image Analysis-based testing system is recommended for visible applications or for high-speed production testing at any wavelength. The Image Analysis Module comes equipped with the appropriate framegrabber.

VideoMTF®
Revolutionizes MTF Testing

Classical MTF testing is performed by scanning a physical edge across an image produced by an optical system edge or slit. The resultant “knife-edge scan” is a graph of the amount of light passing the edge as a function of its position. The derivative of the knife-edge function is the Line Spread Function (LSF), a onedimensional profile of the image. The MTF of the system is the magnitude of the Fourier transform of the LSF. The VideoMTF® module uses an innovative acquisition technology to capture the entire image instantly. The area of interest, the image, is fixed within two rectangular “crosshairs” on the screen. The location of the crosshairs can be adjusted manually by the operator or automatically by the VideoMTF® module. The image area defined by the crosshairs is mapped into the computer memory through a framegrabber board. Two orthogonal LSFs are derived from the “grabbed” images and the MTF is calculated and graphically displayed. It all happens in a fraction of a second, and is continuously updated so that the MTF is displayed in real-time.

Features

• Real-time measurements
•  3D point spread function display
•  Frame refresh rates up to 30 Hz,
• supports RS-170, CCIR, Fire Wire
•  Framegrabber gain and offset control
•  Background/dark current
• correction
•  Sloping slit/edge correction
•  Video camera