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28629-4. A visual field test is an eye examination that can detect dysfunction in central and peripheral vision which may be caused by various medical conditions such as glaucoma, stroke, pituitary disease, brain tumours or other neurological deficits. Visual field testing can be performed clinically by keeping the subject's gaze fixed while ...
Indian-head test pattern. 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 ...
Screen Tests. The Screen Tests are a series of short, silent, black-and-white film portraits by Andy Warhol, made between 1964 and 1966, generally showing their subjects from the neck up against plain backdrops. The Screen Tests, of which 472 survive, depict a wide range of figures, many of them part of the mid-1960s downtown New York cultural ...
The blue–white screen is a screening technique that allows for the rapid and convenient detection of recombinant bacteria in vector -based molecular cloning experiments. This method of screening is usually performed using a suitable bacterial strain, but other organisms such as yeast may also be used. DNA of transformation is ligated into a ...
SMPTE ECR 1-1978 (SDTV) In a SMPTE color bar image, the top two-thirds of the television picture contain seven vertical bars of 75% intensity. In order from left to right, the colors are white or gray, yellow, cyan, green, magenta, red, and blue. [18] The choice of white or gray depends on whether that bar's luminance is 100% or not.
In the double-slit experiment, the two slits are illuminated by the quasi-monochromatic light of a single laser. If the width of the slits is small enough (much less than the wavelength of the laser light), the slits diffract the light into cylindrical waves. These two cylindrical wavefronts are superimposed, and the amplitude, and therefore ...
Display contrast. Contrast, in physics and digital imaging, is a quantifiable property used to describe the difference in appearance between elements within a visual field. It is closely linked with the perceived brightness of objects and is typically defined by specific formulas that involve the luminances of the stimuli.
The plain white background behind the bowler enables the batsman to spot the red ball. In cricket, a sight screen is an apparatus, often comprising wooden or poly-carbonate slats, or cloth sheeting, on a large frame made of wood or another material, that is positioned alongside the cricket field to provide the batsmen a clear view of the bowler ...