(Society of Motion Picture and Television Engineers) - An industry organization which sets technical standards and specifications in the film and television industries.

Spatial resolution refers to the camera’s ability to sharply and clearly define the extent or shape of features within an image. It describes how close two features can be within an image and still be [..]

By looking at and comparing the value of pixels in a sample “bright” area of an image, the average value of all the pixels is calculated showing the variance of each pixel from the mean. This gives a [..]

Videocassette recorder.

A form of oscilloscope which graphically displays the levels of a video signal.

A lens which has a continuously variable focal length from wide angle to telephoto.

The opening which allows light to pass through a camera lens. An adjustable diaphragm is used to control the size of the opening.

A side effect in video or audio caused by signal processing. In video, artifact is usually a term describing a defect or flaw in the image.

The aspect ratio is the ratio of the width of an image to its height. A standard NTSC image has a 4:3 aspect ratio. Most enhanced and high definition video systems have a 16:9 aspect ratio.

The average signal level with respect to blanking during the active picture time. APL is expressed as a percentage of the difference between the blanking and reference white levels.