Algolith XVC-1001-DC Manuale Utente

XVC-1001-DC

Guide to installation and operation

34

More advanced de-interlacing techniques include frame-based, motion-

adaptive de-interlacing. This is essentially the same technique described 

above however, by using a simple motion calculation, the video processor 

can determine when no movement has occurred in the entire picture. If 

nothing in the image is moving, the processor combines the two fields 

directly. With this method, still images can have the complete 1080 lines 

of vertical resolution, but as soon as there is any motion, half of the data 

is discarded and the resolution drops to 540 lines. So, while static images 

look sharp, moving images does not.

The most advanced de-interlacing techniques available are pixel-based 

and motion-adaptive. With this type of processing, motion is identified 

at the pixel level rather than the frame level, discarding only the pixels 

that would cause combing artifacts and displaying everything else at full 

resolution.  Pixel-based motion-adaptive de-interlacing avoids artifacts in 

moving objects and preserves full resolution of non-moving portions of the 

screen even if neighbouring pixels are in motion.

An upconverter converts video with a higher picture resolution to one 

with a lower definition. Typically, it refers to taking programming in high-

definition (1080i or 720p) and making it into standard definition (480i 

or 576p). Converting high-definition video to  standard definition video 

involves resizing an image to contain as much as six times less the 

number of pixels it had originally. This is done through interpolation, which 

discards pixels that aren’t needed to render the lower resolution image.