|
Scalers and upconverters take one video resolution and adjust it to another resolution. Scalers/upconverters can use several techniques to do this: de-interlacing, line duplication, line averaging, and motion interpolation. Some of these techniques produce a better image than others. To read about these techniques in detail, see the article:Line Doubling/Quadrupling Techniques. The difference between a scaler and an upconverter is a scaler can adjust resolutions up or down, while an upconverter can only increase resolution.
When selecting a scaler/upconverter, look for these features:
- Aspect ratio control: This feature means the scaler can horizontally and vertically resize the video image to match a specified aspect ratio, filling the display, and improving the overall perception of the displayed image.
- Preprogrammed for plasma displays: The scaler is designed to output video that will best match the abilities of the most common plasma displays.
Autoscanning: Allows the scaler to automatically recognize a range of input frequencies. The scaler is not limited to defined resolutions.
- Memory presets: This feature saves size, centering, and filter settings so that when the same signal is selected again, all settings will be recalled.
Horizontal and vertical filtering: These adjustments allow the user to reduce image jitter, improve image stability, and prevent detail loss.
- IP Link™ and RS-232 Control: Allows the scaler to be remotely controlled via Ethernet by a control system.
|
