| 释义 |
gray scale
gray′ scale`
n. a scale of achromatic colors having equal gradations ranging from white to black. gray scale
gray scale[′grā ‚skāl] (optics) A series of achromatic tones having varying proportions of white and black, to give a full range of grays between white and black; a gray scale is usually divided into 10 steps; however, electronic scanners can typically differentiate 16 to 256 levels. gray scaleA series of achromatic samples in discrete steps in lightness from white to black.gray scaleA series of shades from white to black. The more shades, or levels, the more realistic an image can be recorded and displayed, especially a scanned photo. Scanners differentiate typically from 16 to 256 gray levels, and high-resolution gray scale is widely used for medical x-rays.
At a resolution of 300 dpi, each square inch comprises 90K pixels (300x300). At one byte per pixel (256 levels), a 10x10" image would take up 9MB of storage (90K x 100). See halftone.gray scale
scale [skāl] 1. a thin flake or compacted platelike body, as of cornified epithelial cells. See also squama.2. a scheme or device by which some property may be measured (as hardness, weight, linear dimension).3. to remove incrustations or other material from a surface, as from the enamel of teeth.absolute scale (absolute temperature scale) 1. one with its zero at absolute zero (−273.15°C, −459.67°F).2. Kelvin s.ASIA scale a descriptive tool developed by the American Spinal Injury Association (ASIA) as a part of the complete classification of patients with spinal cord injuries. Called also Frankel Classification. See accompanying table.Bayley S's of Infant Development a psychological test for assessing development of infants, using motor, mental, and behavioral developmental scales.Borg scale a numerical scale for assessing dyspnea" >dyspnea, from 0 representing no dyspnea to 10 as maximal dyspnea.Brazelton Neonatal Behavioral Assessment scale a behavioral assessment scale used to evaluate the interactive behavior of a newborn by its responses to environmental stimuli.Celsius scale (C) a temperature scale with zero at the freezing point of water and the normal boiling point of water at 100 degrees. The abbreviation 100°C should be read “one hundred degrees Celsius.” (For equivalents of Celsius and Fahrenheit temperatures, see Appendix.)centigrade scale one with 100 gradations or steps between two fixed points, as the Celsius scale.Fahrenheit scale (F) a temperature scale with the freezing point of water at 32 degrees and the normal boiling point of water at 212 degrees. The abbreviation 100°F should be read “one hundred degrees Fahrenheit.” (For equivalents of Fahrenheit and Celsius temperatures, see Appendix.)French scale one used for denoting the size of catheters, sounds, and other tubular instruments, each French unit (symbol F) being approximately 0.33 mm in diameter.Glasgow Coma scale a standardized system for assessing response to stimuli in a neurologically impaired patient, assessing eye opening, verbal response, and motor ability. Reaction scores are depicted in numerical values, thus minimizing the problem of ambiguous and vague terms to describe the patient's neurologic status. (See accompanying Table.) The total score is obtained by adding E, M, and V; a score of 7 or less indicates coma and a score of 9 or more rules out coma.Global Assessment of Functioning (GAF) scale a hundred-point scale used as axis V of DSM-IV to assess a client's recent and current levels of social, psychological, and occupational functioning.gray scale a representation of intensities in shades of gray, as in gray-scale ultrasonography.interval scale a scale having equal numerical distances between intervals in addition to mutually exclusive categories, exhaustive categories, and rank ordering but no zero point.Karnofsky scale (Karnofsky performance scale) a widely used scale" >performance scale, assigning scores ranging from 0 for a nonfunctional or dead patient to 100 for one with completely normal functioning.Kelvin scale an absolute scale in which the unit of measurement, the kelvin, corresponds to that of the Celsius scale; therefore the ice point is at 273.15 kelvins.Likert scale a tool used to determine opinions or attitudes; it contains a list of declarative statements, each followed by a scale on which the subject is to indicate degrees of intensity of a given feeling.Neonatal Behavior Assessment scale Brazelton Neonatal Behavioral Assessment Scale.performance scale a scale that measures a patient's status" >performance status, serving as a prognostic indicator of seriousness of disease or disability. The most widely used scale is the scale" >Karnofsky scale.Problem Rating scale for Outcomes see problem rating scale for outcomes.semantic differential scale a measurement device that consists of two opposite adjectives with a seven-point scale between them; each item under examination is assigned to a specific point on the scale.temperature scale one for expressing degree of heat, based on absolute zero as a reference point, or with a certain value arbitrarily assigned to such temperatures as the ice point and boiling point of water.gray-·scale ul·tra·so·nog·ra·phythe display of the ultrasound echo amplitude or signal intensity as different shades of gray, improving image quality compared to the obsolete black and white presentation.
lat·i·tude (la'ti-tūd), The range of light or x-ray exposure acceptable with a given photographic emulsion. See: latitude film. Synonym(s): digital gray scale, gray scale [L. latitudo, width, fr. latus, wide] A description of the number of colours or shades of gray a monitor can display or a scanner can process; the higher the bit depth, the higher the number of colour hues that can be supportedgray scale Imaging See Ultrasonography InformaticsSee Bit depth. gray-scale ul·tra·so·nog·ra·phy (gră'skāl ŭl'tră-sŏ-nog'ră-fē) The display of the ultrasound echo amplitude or signal intensity as different shades of gray, improving image quality compared with the obsolete black-and-white presentation. FinancialSeescale |