Like line doublers and quadruplers, a video scaler combines the information in the odd and even fields of an incoming video signal into a combined, non-interlaced picture. Then, taking advantage of the latest electronics technology , the video scaler uses sophisticated, processing algorithms to manipulate the image, changing its resolution, refresh rate, and even aspect ratio, to exactly match the desired output specifications. The advantages of video scaling are obvious. Video scaling eliminates the many limitations imposed by line doubling and quadrupling technology. When using a video scaler, a projector or display device is not forced to crop, distort, or further process the image in order to display it.
Video scalers can provide outputs at multiple refresh rates.
One example of how this might be beneficial is in providing the ability to display converted PAL video on projectors that do not support 50 Hz refresh rates. Another example would be displaying converted video at 75 Hz, eliminating all visible flicker, improving the light output of the display or projector, and easing eye strain. In addition to these many advantages, there is one more that requires a bit of explanation. Video scalers allow you to generate an output that exactly matches the native resolution of your LCD or DLP projector or plasma display something impossible when using a line doubler or quadrupler. LCD and DLP projectors and plasma displays are the types of products most commonly used in conjunction with line doublers, quadruplers and video scalers.