| OFF-LINE |
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| A cost-effective preliminary stage of video editing, using low-grade copies of the edited material mainly for control and edit-design purposes. |
| OIRT |
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| An obsolete eastern European broadcasters union, which merged with the EBU in 1993. The name was also used to describe the broadcasting system in the Eastern Block - a modified SECAM system. |
| ON-LINE |
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| Actual video editing, using high quality materials usually based on decisions made during the Off-Line stage. |
| OVERLAY |
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(рус. Наложение)
Keyed insertion of one image into another. Overlay is used, for example, to super-impose computer generated text on a video image for titling purposes. The overlay procedure requires genlocked sources for proper operation. In the computer field, overlay files are accessory files containing mainly graphics information, following or within computer programs.
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| OVERSAMPLING |
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| When a signal is digitally sampled at frequencies much higher than the NYQUIST frequency. When this method is used, filtering the signals is easier and less expensive, although sampling at higher frequencies is more problematic. |
| OVERSCAN |
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| Displaying a video or computer generated image in a size exceeding the physical screen, therefore showing only part of the information. Overscan normally stretches the image in both directions, and is used to fill up a screen with an image initially smaller than the screen, like some computer generated graphics images in formats smaller than video (CGA or EGA images.) |
| OVERSHOOT |
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(рус. Перерегулирование)
A distortion in a signal due to imperfections in the processing in the signal path. For example, when a square wave has sharp spikes at its edges. The overshoot level is measured as the percentage of the spikes relative to the original signal. Sometimes overshoot is done on purpose, emphasizing the edges of a video signal to create a sharpness effect.
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