| IEEE 1394 |
See firewire |
| Image format |
Aspect ratio from image width to image height. All video formats have the conventional 4:3 format. Also for data formats VGA, SVGA and XGA this ratio is maintained. The calculation of the image diagonal is very easy: Width to height to diagonal is 4:3:5. SXGA has a 5:4 image size while HDTV has the 16:9 standard size. |
| Image size |
With an aspect ratio of 4:3 (VGA-, SVGA-,SXGA resolution) the image size values of a digital projector are determined as follows: Image diagonal = image width x 1,25; Image width = image diagonal : 1,25; image height = image diagonal x 0,6 or image width x 0,75. |
| Inline magazine projector (slide) |
Is equate by many with amateur projector as it is the most common projector type. The slide is tugged laterally by a slide feed in the optical path. Disadvantage for dissolve projections. Since the slide is pulled against a stop unit (for example a spring), a bounce effect will result. Hence, the collateral positioning varies even though it is only by a fraction of a millimetre. At the large projection, however, a fraction of an inch is visible on the screen. Inline magazine projectors operate with 150 W or 250 W lamps and are mostly small-picture projectors. |
| Interchangeable lenses |
Thanks to interchangeable lenses with different focal width the projection image can easily be adjusted to the screen - or room size. |
| Interlaced |
This is an image formation where initially a half image (every second image line) is produced and thereafter the second half image is placed in the gap. Due to the double image frequency the flickering is reduced. All normal video norms work according to this principle while HDTV is working without line skip. Interlace is no longer common with data images. |
| Interpolation |
Mathematical process to approximate out of known data the values of unknown data. The process plays a decisive roll in the magnified or decreased reproduction of images, particularly when adjusting the resolution to the module size of the data projectors. Magnified reproduction is called Resizing, decreased reproduction is called compression. |
| IR |
Infrared, invisible light with large wave length, used for the transmission of remote control signals |
| IR mouse remote control |
The PC mouse can be controlled via the remote control of the projector. |
