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The face may also include a second hand, which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has ...
Chronometer circa 1844-1860. A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.
Surveillance cameras on the corner of a building. Surveillance camera in a residential community. Dome camera in Rotterdam central metro station. Closed-circuit television ( CCTV ), also known as video surveillance, [1] [2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors.
This category is for images (including graphics and photographs) taken or made by members of the U.S. military or Department of Defense during the course of the person's official duties. Under United States copyright law, such images are public domain . The preferred destination for such uploads is Commons Category:PD US Military.
An event camera, also known as a neuromorphic camera, [1] silicon retina [2] or dynamic vision sensor, [3] is an imaging sensor that responds to local changes in brightness. Event cameras do not capture images using a shutter as conventional (frame) cameras do. Instead, each pixel inside an event camera operates independently and asynchronously ...
This image was selected as picture of the day on Wikimedia Commons for 20 November 2013. It was captioned as follows: English: The Prague astronomical clock (in Old Town Square) was installed in 1410 by clock-makers Mikuláš of Kadaň and Jan Šindel, and is the oldest functioning Astronomical clock in the world.
These cameras do not require a video capture card because they work using a digital signal which can be saved directly to a computer. The signal is compressed 5:1, but DVD quality can be achieved with more compression (MPEG-2 is standard for DVD-video, and has a higher compression ratio than 5:1, with a slightly lower video quality than 5:1 at best, and is adjustable for the amount of space to ...
Thermography. Thermogram of a traditional building in the background and a "passive house" in the foreground. Infrared thermography ( IRT ), thermal video and/or thermal imaging, is a process where a thermal camera captures and creates an image of an object by using infrared radiation emitted from the object in a process, which are examples of ...