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| Terms Infusion - v. |
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H |
| HDTV |
| High-definition Television (1035, 1080 and 1125 lines interlace, and 720 and 1080 line progressive formats with a 16:9 (i.e. 1.77) aspect ratio. |
| Horizontal Frequency |
| The frequency at which scan lines are generated, which varies amongst sources. Also called horizontal scan rate or line rate. |
| Horizontal Offset |
| The difference between the center of the projected image and the center of the projector lens. For clarity, offset is often expressed as the maximum amount of the image that can be projected to one side of the lens center without degrading the image quality. Horizontal offset ranges can be affected by the type of lens in use, and whether or not the image is offset vertically at the same time. |
| Hot Spot |
| A circular area of a screen where the image appears brighter than elsewhere on the screen. A hot spot appears along the line of sight and “moves” with the line of sight. High gain screens and rear screens designed for slide or movie projection usually have a hot spot. |
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