Search results
Results from the WOW.Com Content Network
A video light is a powerful light source used primarily for shooting video in environments with insufficient natural light, but can also be used as the primary light source for still photography. Placement of the video light follows the same recommendations as for flash photography, with the advantage that the illumination can be clearly seen ...
They are generally not important for dive safety, but are required for the video camera to get an acceptable image quality, either for video recording, or for the surface team to monitor the work done by the diver. Modern underwater video lights are now relatively small, have run times of 45–60 minutes and output 600–8000 lumens.
In 1909, Albert Samama Chikly took the first underwater shot. [1] In 1910, he filmed Tuna fishing in Tunisia under the patronage of Albert I, Prince of Monaco. [2] In 1940 Hans Hass completed Pirsch unter Wasser (i.e. Stalking under Water) which was published by the Universum Film AG, lasted originally only 16 minutes and was shown in theatres before the main movie, but would eventually be ...
Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water. They are also blurred by scattering of light between the object and ...
Snell's window (also called Snell's circle [1] or optical man-hole [2]) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. [3] This phenomenon is caused by refraction of light entering water, and is governed by Snell's Law. [4]
Underwater writing slates and pencils are used to transport pre-dive plans underwater, to record facts while underwater and to aid communication with other divers. Dive lights , which are usually waterproof and pressure rated torches or flashlights , are essential for safety in low visibility or dark environments such as night diving and wreck ...
A video plankton recorder (VPR) is towed underwater video microscope system, which photographs small to fine-scale structure of plankton, from 50 micrometers and up to a few centimeters in size. [ 1 ] [ 2 ] A VPR consists of five general components: cameras (with magnifying optics [ 3 ] ), strobe, additive sensor and flight control, underwater ...
Underwater computer vision is a subfield of computer vision. In recent years, with the development of underwater vehicles ( ROV, AUV, gliders), the need to be able to record and process huge amounts of information has become increasingly important. Applications range from inspection of underwater structures for the offshore industry to the ...