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Test card. SMPTE color bars: common NTSC test pattern. PM5544: common PAL test pattern. EBU colour bars (4:3) A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at sign-on and sign-off ). [ 1]
The Indian-head test pattern is a test card that gained widespread adoption during the black-and-white television broadcasting era as an aid in the calibration of television equipment. It features a drawing of a Native American wearing a headdress surrounded by numerous graphic elements designed to test different aspects of broadcast display.
Angle of view (photography) A camera's angle of view can be measured horizontally, vertically, or diagonally. In photography, angle of view ( AOV) [ 1] describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view . It is important to distinguish the angle of view ...
Bechdel test. The American cartoonist Alison Bechdel incorporated her friend's "test" into a strip in Dykes to Watch Out For. The Bechdel test ( / ˈbɛkdəl / BEK-dəl ), [ 1] also known as the Bechdel-Wallace test, is a measure of the representation of women in film and other fiction. The test asks whether a work features at least two female ...
In digital photography, the image sensor format is the shape and size of the image sensor . The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras ...
A webcam is a video camera which is designed to record or stream to a computer or computer network. They are primarily used in video telephony , live streaming and social media , and security . Webcams can be built-in computer hardware or peripheral devices , and are commonly connected to a device using USB or wireless protocols .
A gamma camera ( γ-camera ), also called a scintillation camera or Anger camera, is a device used to image gamma radiation emitting radioisotopes, a technique known as scintigraphy. The applications of scintigraphy include early drug development and nuclear medical imaging to view and analyse images of the human body or the distribution of ...
Camera. Leica camera (1950s) Hasselblad 500 C/M with Zeiss lens. A camera is an instrument used to capture and store images and videos, either digitally via an electronic image sensor, or chemically via a light-sensitive material such as photographic film. As a pivotal technology in the fields of photography and videography, cameras have played ...