Compression

Many projectors capable of projecting images with resolutions higher than his right. Just skip lines and columns. As the image quality is affected, many manufacturers have been devoted to improving special compression methods. Virtually all projectors and plasma screens have the ability to accept higher resolution inputs than they are designed for (the exception is purely video projectors). Compression is also used in video systems. For example DVD's use MPEG-2 compression to fit reasonable amounth of video onto a disk.

The new image compression algorithm and wireless network technology developed at this time not only achieves high image quality in decompressed images but, thanks to the Vector Quantization technique, also enables significantly faster image decompression processing compared to the JPEG method. This makes it possible to achieve real-time wireless presentations, a feat which previously had been difficult to achieve.

Compression technology--which allows a projector to display at a resolution higher than its native one--may be problematic because the projected image is not what appears on your computer screen. An SVGA projector compressing a 1024x768 image must drop 224 vertical lines and 168 horizontal lines to fit the same data into an 800x600 projection.

So for example, let's assume you have a  video projector with a native resolution of 1280x720 that is capable of displaying an HDTV 1080i signal. That means that the projector's physical pixel matrix is 1280 pixels wide by 720 pixels in height.

However, each frame of video in an HDTV 1080i signal contains 1920x1080 pixels, which is a lot more than the projector has on its physical display. So in order to display the 1080i signal the projector must compress it into a 1280x720 format. It can do this because it has been programmed to do the compression from 1920x1080 to 1280x720. Furthermore, if 1920x1080 is the highest resolution that your projector has been programmed to recognize and compress into its native display, then 1920x1080 is known as the maximum resolution of that projector.