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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
A method of motion estimation. A search for the picture area that best matches a specific macro block of preceding and/or subsequent pictures.
Industry:Entertainment
Used to indicate the amount and color of light being given off by an object and is based on the concept of a “black body.” A black body is one which absorbs all incident light rays and reflects none (therefore, a theoretical concept only). If the black body is heated, it begins to emit visible light rays, first dull red, then red, then through orange to “white heat.” It can be likened to the heating of metal. If a metal object is heated enough, the metal body will emit the array of colors mentioned above until the object achieves a bluish-white light. The amount of light being emitted by the body can then be correlated to the amount of “heat” it would take to get the body that hot and that heat can be expressed in terms of degrees Kelvin. Objects that give off light equivalent to daylight have a Kelvin temperature of about 6,500 degrees Kelvin. Colors with a bluish tint, have a color temperature of about 9,000 degrees Kelvin.
Industry:Entertainment
The process of moving blocks of data from one place to another rather than a byte at a time in order to save processor time and to expedite screen display in operations such as vertical rolling of video.
Industry:Entertainment
Over a wide range of conditions of observation, many colors can be matched completely by additive mixtures in suitable amounts of three fixed primary colors. The choice of three primary colors, though very wide, is not entirely arbitrary. Any set that is such that none of the primaries can be matched by a mixture of the other two can be used. It follows that the primary color vectors so defined are linearly independent.
Therefore, transformations of a metameric match from one color space to another can be predicted via a matrix calculation. The limitations of color gamut apply to each space. The additive color generalization forms the basis of most image capture, and of most self-luminous displays (i.e., CRTs, etc.).
Industry:Entertainment
An artifact that refers to the tile-like appearance of a compressed image where the 8x8 blocks have become visible due to a (too) hard compression.
Industry:Entertainment
a) The colors of three reference lights by whose additive mixture nearly all other colors may be produced. b) The primaries are chosen to be narrow-band areas or monochromatic points directed toward green, red, and blue within the Cartesian coordinates of three-dimensional color space, such as the CIE x, y, z color space. These primary color points together with the white point define the colorimetry of the standardized system. c) Suitable matrix transformations provide metameric conversions, constrained by the practical filters, sensors, phosphors, etc. employed in order to achieve conformance to the defined primary colors of the specified system. Similar matrix transformations compensate for the viewing conditions such as a white point of the display different from the white point of the original scene. d) Choosing and defining primary colors requires a balance between a wide color gamut reproducing the largest number of observable surface colors and the signal-to-noise penalties of colorimetric transformations requiring larger matrix coefficients as the color gamut is extended. e) There is no technical requirement that primary colors should be chosen identical with filter or phosphor dominant wavelengths. The matrix coefficients, however, increase in magnitude as the available display primaries occupy a smaller and smaller portion of the color gamut. (Thus, spectral color primaries, desirable for improved colorimetry, become impractical for CRT displays.) f) Although a number of primary color sets are theoretically interesting, CCIR, with international consensus, has established the current technology and practice internationally that is based (within measurement tolerances) upon the following: Red – x = 0.640, y = 0.330; Green – x = 0.300, y = 0.600; Blue – x = 0.150, y = 0.060.
g) SMPTE offers guidance for further studies in improving color rendition by extending the color gamut. With regard to color gamut, it is felt that the system should embrace a gamut at least as large as that represented by the following primaries: Red – x = 0.670, y = 0.330; Green – x = 0.210, y = 0.710; Blue – x = 0.150, y = 0.060.
Industry:Entertainment
a) Occurs in a multistage routing system when a destination requests a source and finds that source unavailable. In a tie line system, this means that a destination requests a tie line and receives a tie line busy message, indicating that all tie lines are in use. b) Distortion of the received image characterized by the appearance of an underlying block encoding structure.
Industry:Entertainment
Subtractive colorimetry achieves metameric matching by removing portions of the spectrum from white light. The subtractive counterparts to the additive color primaries are those which when removed from white leave the red, green, and blue accordingly cyan, magenta, and yellow. Combinations of these subtractive colors in various add mixtures provide metameric matches to many colors. Subtractive color principles are employed in all hard-copy color images and in light-valve systems such as color transparencies, LCD panel display, motion-picture films, etc.
Industry:Entertainment
This effect is sometimes called whiter-than-white. Blooming occurs when the white voltage level is exceeded and screen objects become fuzzy and large.
Industry:Entertainment
a) Characteristics of color reproduction including the range of colors that a television system can reproduce. Some ATV schemes call for substantially different colorimetry (with a greater range) than NTSC’s.
b) The techniques for the measurement of color and for the interpretation of the results of such computations. Note: The measurement of color is made possible by the properties of the eye, and is based upon a set of conventions.
Industry:Entertainment
