A block of data that (a) may contain, in standardized format, data concerning production, ownership, access, previous processing, etc. , relevant to the basic interpretation of the data, and (b) enhances the utility of the main data for the user.

A compact label for image files, created using a universally accepted algorithm, that (a) identifies the encoding standard, (b) specifies the length of the file, (c) indicates whether a readable descriptor is included, (d) permits random interception of data stream, and (d) offers optional error protection.

The defining file format for exchange of digital motion-picture information on a variety of media between computer-based systems.
Note: This flexible file format describes pixel-based (raster) images with attributes defined in the binary file descriptor—which identifies (a) generic file information, image information, data format, and image orientation information; (b) motion-picture and television industry-specific information; and (c) user defined information. The… (Read More →)

A recommended practice intended to provide a method of coding video index information in which various picture- and program-related source data can be carried in conjunction with the video signal.
Note: There are three classes of video index data based on type and use of the data. Class 1 contains information that is required to know how to use the… (Read More →)

In radio reception using heterodyning in the tuning process, an undesired input frequency that is capable of producing the same intermediate frequency (IF) that the desired input frequency produces.
Note: The term image arises from the mirror-like symmetry of signal and image frequencies about the beating-oscillator frequency.

Synonym image rejection ratio.

The creation of an image from an image concept.
Note: The image can be created with computer-graphics software or photography, for example.

A Web page feature in which hyperlinks are assigned ("mapped") to different portions of a graphic image, thereby allowing users to access links by clicking with a mouse on the mapped areas.
Note: Image map requests are processed by CGI scripts on the server.

In reception using heterodyning in the tuning process, the ratio of (a) the intermediate-frequency (IF) signal level produced by the desired input frequency to (b) that produced by the image frequency.
Note 1: The image rejection ratio is usually expressed in dB.
Note 2: When the image rejection ratio is measured, the input signal levels of the desired and image… (Read More →)

Collectively, the representations of objects reproduced electronically or by optical means on film, electronic display devices, or other media. [JP1]