Download E-books Video Codec Design: Developing Image and Video Compression Systems PDF

Video compression coding is the permitting know-how in the back of a brand new wave of conversation functions. From streaming net video to broadcast electronic tv and electronic cinema, the video codec is a key development block for a bunch of recent multimedia functions and providers. Video Codec layout units out to de-mystify the topic of video coding and current a pragmatic, design-based method of this rising field.

Featuring:
* assistance at the sensible layout and implementation of video coding technology.

* rationalization of the key video coding criteria, together with MPEG-2, MPEG-4, H.263 and H.26L.

* precise insurance of key video coding options and center algorithms.

* exam of serious layout matters together with transmission, caliber of carrier and processing platforms.

* A wealth of illustrations and useful examples, together with quantitative comparisons of layout alternatives.
Video Codec layout presents communications engineers, method designers, researchers and technical managers with a necessary guide to photo and video compression expertise. The transparent presentation and emphasis on real-life examples make this publication a good instructing device for laptop technology and digital engineering teachers.

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Y). T reconstructs a block of picture samples horn an array of BCT coe~ficients. The IDCT takes as its enter a block of X x eight DCT coefficients F , , and r c c o ~ s ~ i ~acblock ts of X x eight picture samples ,LJ(Equation 7. 2). C(x) and C ( y ) are an identical constrams as for the FDCT. ~i~~~~ 7. three DCT foundation services (plotted as surfaces) 1 DISCRETE COSlNE TKANSFOKIVl DCT foundation styles determine 7. five indicates an eight x X block of samples (b) taken from snapshot (a). The block i s tsansFoonned with a 2-D DCT to supply the coefficients proven in photograph (c). 7hc six nicsst s i ~ ~ ~ f i ccoef~cien~s ant are: (0, 0), ( I , 0),( I , l), (2, 01, (3, zero) and (4, zero) and those are h i ~ ~ ~ ion~ the h t desk e ~ of coefficients (Table 7. 1). re 7. five (a) unique snapshot; (b) eight x eight block OP samples; (c) 2coefficients 132 remodel CODMG determine 7. five (Continued) 33 DISCRETE WAVELET rework ble 7. 1 DCT coefficients I thirteen. 6 I 1. 2 1 1. eight four. 2 1-1. eight 2. three 1-0. 6 I I i 2. zero 1 2. nine zero. 2 I- 1. 6 zero. 7 I-0. 6 zero. 4-0. 5-0. 1 1. zero - -O. G zero. 1 -0. three 1. zero A ~ e a s o ~ a bapproximation ~e to the unique snapshot block name be r e c ~ ~ n ~from ~ ~ simply ~ ~ t e d those six coefficients, as proven iu determine 7 6. First. coefficrent (0, zero) i s mulliplied through a weight of 967. five and t r a n s f o r ~ ewith ~ the inverse DCT. This coefficient ~ e ~ r e s ethe ~ts avcrnge ‘shade‘ of the block (in this situation, mid-grey) and is ofie 6: coefficient is mostly e most important in ched block shaped via the DC c o e ~ ~ C ~only e n t (I cient (1, zero) is ~ ~ ~ lby ~a ~weight ~ ? of l i ~ ~ pattena). The weighted has15 ern i s proven within the moment roir: of and the sum of the 1st p ms is proven on tlie correct. As each one of styles is further to the recotislruction, extra element i\ additional to the reconstructed block. the ultimate end result (shown o wing simply 6 out o f the sixty four ~ o c ~ ~ ~i e n ~ s ) i ~ l u s ~ r a {he ~ e stwo key ~ r ( ~of the f ~ e ~ ~ ~ ~ ~ tion) and the block may well bc r ~ ~ ~ ~ ~ s tusing r u c ordy t e ~a ~ n t i l l ~~1~~~~ of c o ~ f ~ ~ i ~ ~ ~ ~ ~ I remodel CODWC DISCRETE WAVELET rework determine 7. 7 (a) unique photograph: (b) single-stage wavelct decomposition a hundred thirty five dimensions. The top-right nook (‘ L‘) involves residual vertical frequencies (i. e. the vertical c o ~ ~ o n e of n t the adaptation among the subsa~pled‘U’image and the unique image). The ~ o t t o I n - ~corner e ~ ‘LH’ includes residual horizontal frequencies the accordion keys are very obvious here), while the bottom-right nook ‘ residual diagonal f r e ~ ~ ~ ~ ~ i e s . This d e c o ~ p o strategy ~ ~ ~ ~may ~ nbe repeated for the ‘LE CoKL~olleKltto produce one other set of 4 compianents: a brand new ‘Lk‘ compoiient that may be a additional subsampled model of the ating the decomposio r ~ ~ i nimage, al plus t e extra residual frequency parts. he small photo within the tion thrice provides wavelet r e p r e s ~ n t a t ~shown o ~ in determine filtered unique and the rest sq sntain steadily best left is h e low-p h i ~ ~ e r - f r e ~ ~ eresidual n c y elements.

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