Wireless Data Technologies reference phần 7 pptx

... it changes frequently. 134 WIRELESS DATA NETWORKS 25 24 22 20 18 16 14 12 10 8 6 4 2 23 21 19 17 15 11 9 7 5 3 1 SNR 10–15 dB, datarate >= 5.5 Mb SNR > 15 dB, datarate = 11 Mb Figure 8.20 ... decode sniffed data packets. If the intruding WLAN user manages to capture WEP 144 WIRELESS DATA NETWORKS Once there is an Association with the AP and a proper IP address and subnet ma...

Ngày tải lên: 14/08/2014, 16:20

... to facilitate handling such data rates. Compression is the reduction of redundancy in data. Generic lossless compression algorithms, which assure the perfect reconstruction of the initial data, could be used ... CODING AND COMPRESSION Visual data in general and video in particular require large amounts of bandwidth and storage space. Uncompressed video at TV-resolution has typical data...

Ngày tải lên: 09/08/2014, 19:21

... in 0 1 2 3 4 5 6 0 .78 0 .79 0.8 0.81 0.82 0.83 0.84 0.85 0.86 Minkowski summation exponent Correlation Pearson Spearman Pearson Spearman 0 20 40 60 80 100 0 .7 0 .72 0 .74 0 .76 0 .78 0.8 0.82 0.84 0.86 Histogram ... 2 .7) , the PDM implements a decomposition of the input into a number of channels based on the spatio-temporal mechanisms in the visual system. As discussed in 0 .7 0...

Ngày tải lên: 09/08/2014, 19:21

... 1 .7 to 40 GHz. The lower frequencies are most commonly used by carriers for backhaul INTRODUCTION 179 2 X Milk @ $4.00/each = $8.00 1 X Vngr @ $3. 27/ each = $3. 27 4 Ib Chkn @ $1.99/Pound = $7. 96 Total ... technology. Wireless Broadband offers tremendous flexibility and improving performance but it does have some limitations. Wireless broadband uses radio spectrum, which Wireless...

Ngày tải lên: 09/08/2014, 19:22

... BTS binary phase shift keying 10 Bluetooth 1 47, 149, 151, 153, 155, 1 57 broadcast channels (BCH) 42 broadcast control channel (BCCH) 43 BS 47 BSC 47 BSS 47 BTS 47 Burst Formats 44 C Cape Cod, Massachusetts ... November 15, (18 97) . Marconi Telegraphy, London Electrician. (Reprint). Brady, J.T. (1920) Talking by wireless as you travel by train or motor. Boston Sunday Post, November...

Ngày tải lên: 09/08/2014, 19:21

... Performance 68 3.6 Summary 70 4 Models and Metrics 71 4.1 Isotropic Contrast 72 4.1.1 Contrast Definitions 72 4.1.2 In-phase and Quadrature Mechanisms 73 4.1.3 Isotropic Local Contrast 76 4.1.4 Filter Design ... Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England Telephone (+44) 1243 77 977 7 Email (for orders and customer service enquiries): cs-books@wiley.c...

Ngày tải lên: 09/08/2014, 19:21

... Local Reference Appl. (1) Space (2) Lightness (3) form (4) Contrast CSF (5) Masking (6) Pooling (7) Eval. (8) Comments Mannos and Sakrison (1 974 ) IQ, IC Lum. L 0:33 F L 2 R Faugeras (1 979 ) IQ, ... front and back 2 3 4 5 6 7 8 5 10 15 20 25 30 D/H Visual angle [deg] 2 3 4 5 6 7 8 5 10 15 20 25 30 35 40 D/H Resolution [cpd] HDTV (1080 lines) HDTV (72 0 lines) PAL ( 576 lines) NTS...

Ngày tải lên: 09/08/2014, 19:21

... was defined on the basis of the subjective data to provide a quantitative upper limit on prediction performance (VQEG, 2003). 0 .75 0.8 0.85 0.9 0.95 1 0 .75 0.8 0.85 0.9 0.95 1 Pearson linear correlation Spearman ... must use the so-called Riesz transforms (Stein and Weiss, 1 971 ), a series of transforms that are quite difficult to handle in practice. 76 MODELS AND METRICS the objective o...

Ngày tải lên: 09/08/2014, 19:21

... resolution). Table 4.2 Contrast gain control parameters bk pq W-B 6.968 0.2 977 8 2.1158 2 R-G 21.904 0.11 379 2.34 47 2 B-Y 13.035 0. 077 12 2. 278 8 2 98 MODELS AND METRICS 10 –1 10 0 10 1 –45 –40 –35 –30 –25 –20 –15 Spatial ... LP 5.0 19.2 139.5 478 .6 496.5 W-B, BP 112.8 141.0 179 .4 205 .7 120.0 R-G, LP 154.2 354.0 404.0 184.6 27. 0 B-Y, LP 125.6 332 .7 381.4 131.5 28.6 PERCEPTUAL DIS...

Ngày tải lên: 09/08/2014, 19:21

... ARTIFACTS 1 27 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 10 20 30 40 50 60 70 80 Scene 1 Scene ... 5 Scene 6 Scene 7 Scene 8 Scene 9 Condition DMOS 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9...

Ngày tải lên: 09/08/2014, 19:21