Glossary: O
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- Object (PREMIS term)
- A discrete unit of information in digital form. From Introduction and Supporting Materials from PREMIS Data Dictionary, p. 6. The associated footnote adds: " . . . differs from the definition of digital object commonly used in the digital library community, which holds a digital object to be a combination of identifier, metadata, and…
- See Also File format; Digital file
- OCR
- Optical Character Recognition (OCR) is a technology that allows dots or pixels representing machine generated characters in a raster image to be converted into digitally coded text. In addition to recognizing and coding text, OCR programs attempt to recognize and code the structural elements of a document page, such as columns and non-text graphical elements.…
- See Also HCR; ICR
- OCR zoning
- Zoning in OCR is the process of creating zones that correspond to specific attributes of a page element. A zone can be identified as a non-text graphic, alphanumeric or numeric. OCR applications generally allow for automatic or manual zoning.…
- OCR, voting
- A method of improving OCR recognition accuracy through the use of multiple OCR engines, taking the highest combined confidence score to select the letter or word represented in the scanned image.…
- OECF
- Opto-Electronic Conversion Function (OECF) - the average large area digital response of an electronic imaging device to light stimuli.…
- OMR
- Optical Mark Recognition (OMR) is a technology for extracting data from marked fields, such as checkboxes on printed tests, surveys or ballots. Since OMR technology only recognizes the mark and not the context of a form, positional data where marks are expected to appear must be pre-established.…
- Open archival information system (OAIS)
- A high-level model that describes the components and processes necessary for a digital archives, including six distinct functional areas: ingest, archival storage, data management, administration, preservation planning, and access. The OAIS model provides a foundation in the form of a taxonomy of information objects and packages for archived objects, as well as the structure of…
- See Metadata
- Open captions
- Non-XML timed text intended for display over a timeline, in synchronization with image and sound essence, usually written in the same language as the sound essence and permanently embedded or integrated into the video stream. They cannot be delivered in a sidecar file. Like closed captions, open captions are designed for viewers who are unable…
- See Also Closed captions; Subtitles
- Optical Character Recognition
- See OCR
- Optical density
- Optical density generally refers to the opacity of an object, or the transmisson density.…
- Optical Mark Recognition
- See OMR
- Optical resolution
- See Resolution
- Opto-Electronic Conversion Function
- See OECF
- Original-referred
- See Image state
- Output-referred
- See Image state