pixel block

pixel block

A rectangular group of screen pixels. In the digital video world, the data are compressed in blocks of pixels to reduce transmission bandwidth and decompressed for display. When the incoming transmission signal is impeded on action scenes, the decompression circuit cannot keep pace, and some pixels momentarily display in an oversized grid on screen. See blocking artifacts.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Khodaei and Faez [10] proposed a hybrid approach by combining LSB substitution and PVD in 1x3 pixel block. It was further extended to 2x2 size block in [11] to achieve better performance.
The third is to use a pixel block instead of a single pixel as the input signal.
Hence, a pixel block smoothness measuring function needs to be constructed to select appropriate pixel blocks.
The operation of LBP works on 3 x 3 pixel block consisted of eight neighborhood pixels and converting their values into the binary 0 or 1 by comparing with the value of their center pixel of the pattern.
Cross-section of a white 10x10 pixel block on black background before/after application of a 15x15 Gauss blur filter
LFSR engenders random sequence for user's given value to choose one M x N pixel block among an N number of blocks.
The transformed coefficients are encoded using a zigzag sequence of each 8 x 8 pixel block of the image and are thus represented by a stream (linear string of data) of numbers (eg, 19, 13, 13, 9, 11, 45, etc.) including several zeros.
Each pixel block is classified into the regular group R, the singular group S, and the unusable group U by a flipping function and mask M.
In the calculation of the MB-LBP, the comparison between the pixel values of the LBP operator is replaced by the average gray value of the pixel block. MBS-LBP represents an LBP operator with a pixel block that measures SxS.