trueImage=double(trueImage)/512; 为什么一定要除以512源程序如下： %读入原始图像 size=512; block=8; embedded=zeros(size); trueImage=imread('a.bmp' ); subplot(2,2,1); imshow(trueImage); title('原始图像'); trueImage=double(tru_作业帮
trueImage=double(trueImage)/512; 为什么一定要除以512源程序如下： %读入原始图像 size=512; block=8; embedded=zeros(size); trueImage=imread('a.bmp' ); subplot(2,2,1); imshow(trueImage); title('原始图像'); trueImage=double(tru
trueImage=double(trueImage)/512; 为什么一定要除以512源程序如下： %读入原始图像 size=512; block=8; embedded=zeros(size); trueImage=imread('a.bmp' ); subplot(2,2,1); imshow(trueImage); title('原始图像'); trueImage=double(trueImage)/512;%读入水印图像 waterMark=imread('add2.bmp' ); subplot(2,2,2); imshow(waterMark); title('水印图像'); %嵌入水印 for p=1:size/block for q=1:size/block x=(p-1)*block+1;y=(q-1)*block+1; block_dct=trueImage(x:x+block-1,y:y+block-1); block_dct=dct2(block_dct); if waterMark(p,q)==0 a=-1; else a=1; end block_dct(1,1)=block_dct(1,1)*(1+a*0.01); block_dct=idct2(block_dct); embedded(x:x+block-1,y:y+block-1)=block_ end end subplot(2,2,3); imshow(embedded,[]); title('嵌入水印图像');imwrite(embedded,'embedded.bmp');%提取水印 for p=1:size/block for q=1:size/block x=(p-1)*block+1;y=(q-1)*block+1;block1=embedded(x :x + 8 - 1 ,y :y + 8 - 1) ;block2=trueImage(x :x + 8 - 1 ,y :y + 8 - 1) ;block1 = dct2 (block1) ;block2 = dct2 (block2) ;a= block1(1 ,1) / block2(1 ,1) - 1 ;if a
可能是把trueImage图像分成512个单位 每个单位大小即block为8512/8=64,大概就是64=8*8,分成一个8行8列的网格吧.您当前的位置： &
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40/315 E=15MM(KUGELLAGERRAD
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RV11-12-S-0-50
VICTOR-0014
S 82 K312BBTS42K+F
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P-EWV 22L-SV
VOLLMER-0011
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FX62.XXAGB1HKMXX &L=6M
WEIDMULLER-0151
WSI6 订货号101100
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NH00C KTF 35A
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W21-112M-04 &4kw &立式
702.01.100-E-KPaBG-DE-AJ3ZIV
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T-Verschraubung 408-407 阀
PS68.XXDGD2HKMXX
VOGEL-1150
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DG4V-5-2A-M-U-H6-60
双金属温度计TM52.01外径100mm0-
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指示表 VEGA MET 601
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WEBER-0219
WBI412QI-10A/10V
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GSI 130 M2 O/N.244-130-000-20
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WEIDMULLER-0008
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DGMFN-5-Y-B2W-30
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CP70QXVT80
VOITH-0382
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电源模板1X00024H01
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2AI/750-456
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L5L1&1 CANADA &MODEL DC-3500
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161-21.5-103C
VON SCHEVEN-0001
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VIBRO-0019
EA402 913-402-000-012-1-040-0-
VICKERS-1032
DGMC-3-AT-CW-40
VECTRON-0002
BR 1330/48
WALDMANN-0045
VICKERS-0438
DG17S-V4-012C-10
HGI490-06331S
ODG532 G130
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EFO.1ARO 14V-PNP
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McCrometer V-Cone VB10UE01N
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WEIGEL-0061
PQ48K &0-40MICROA
VS1/0.05-80LPM
WEIDMULLER-0282
WOS1/12-28VDC/f=100KHZ/
VOGEL-0505
345-122-222
VUHZ A.S-0103
SH7-S10用SYMETRIC HOLDER,VUHZ
VOGEL-1383
VICKERS-1057
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DG5V 7 6BL V M U H7 30
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S25CP29MDM1
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799150替代1098 图号179387
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WACHENDORFF-0060
WDG58B-100-ABN-I05-S3
214.11 方形：96&96 0-16BAR
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VAHLE-0099
UDV25 C K 4 phase NO:171067
VOGEL-0427
MKU2-KW3-0VAC
VICKERS-0625
DG4V-3-8C-VM-U-D6-61
VICKERS-1637
&DKE1711/A-D24DC &
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NL125/250-15/4
VSENSORS-0002
MODEL 111 P/N445A S/N 252-9
VONSCH-0002
VQFREM 230 004-3M 1*230V
WILLY VOGEL-0015
WARNER-0130
WEIDMULLER-0265
UNICO-0064
312.595 &Puise rate:30000
UNIGATE-0009
SC232/485-PBDP
WEBER-0054
0 S100/S110/650℃
ULVAC-0061
DA-30D 220V 单项
UNILUX-0012
70-1137灯头镜门互锁开关
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DSA13NP40/CIR-06
WENGLOR-0539
WIELAND-0005
WISTRO-0006
B30 IL-2-2/112 30MF 73W 220V
VOGEL-0420
MFE5-BW7 &泵
VICKERS-0754
DG4V-5-2CJ-M-U-H6-20
WACHENDORFF-0098
WDG58B-1000-ABN-I24-S5
WILDEN-0031
TZ4 04-1010-51
VATRON-0032
VMIPCI-55795A
HG136C134M4 7.5KW n=10rpm
WINDHOFF-0003
与WINDHOFF-0002配套使用
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WDG100H-38-4096-ABN-105-K3-B59
WACHENDORFF-0145
WDG50B-100-ADN-124-L3
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IGBT PART NO.
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VAHLE-0009
DSWNG918013
VOGEL-2197
3~MOT PV100-310+140
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CG5V6GWDMUHS20（24V）
VOITH-0426
R16K400M-4220826
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PXA0219GGS521L01AA
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WALDRTCH-0008
UNILUX-0105
UPN05-1517
WALTHER-0127
EC-006-0-WR017-13-2-00-P20
K21R 250M 4 TWS HW
VICKERS-1301
CG5V-8FW-D-VM-U-H5-20
VOGEL-0349
GS6011-S50
VOGEL-1328
N2-4-4X2.3-FUO1
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PVQ40B2RA9SS2F20C21V11
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switch head for flow switch
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DGMX2-5-PP-GW-B-30
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TF88PA3S201
WEIDMULLER-0102
VS4GP012V-32N11/6
WEIGEL-0297
EQ72K & 72*72mm &AC30/5A
J120-190-M446-M201--XY
VOGEL-1530
传感器IR-3002-ARKGN4A
VICKERS-0928
DGFN-X-08-50
UNILUX-0042
LAMP ASSEMBLY FORHD851
VOGEL-1038
28.0E.176.112.800
WEIDMULLER-0100
0Hz 3-12V / 5-48V
VOGEL-0888
VICKERS-1434
XG-03-B-20-JA
VICKERS-2311
C 507826 （220V 50 P07/08）
WHITE-0015
规格：PX60
VOITH-0106
40 M12X12 180℃
WEBER-0224
0，s102,350,degre
WEBER-0065
1342.43V L100 S100 650℃
LBM-FF-NPT
VICKERS-0111
插装阀CVI-40-D20-2M-10
WATLOW-0002
ACJCJOAO50 UJ000 热电偶
VOGEL-0292
VPG-5 通经P006 Zentral-schmier
WACHENDORFF-0192
WDG58H122048ABNI05SC8
WICHITA-0025
VICKERS-2101
DG4V-3-2C-MFTJL-B6-60
VAHLE-0156
PS-19/3.0KW
背向表面直径60 0-40BAR
D85XGG4121AC3LX
VICKERS-1662
VOGEL-1626
WICHITA-0009
ATD-330LIC
HW/C06 16 16
VICKER-0001
DGMA-3-B-40
VOGEL-1418
IR5038 &常闭
VOGEL-1427
PSH95C-350+MYQ
UNIGATE-0002
SC232/485-D9-GT-PBDPV
WAYCON-0092
SX50-50-420A-SA-SE
VICKERS-1150
KDG5V-7-33C170N-70-7-M-V-H1-10
WAGNER-0004
115-10/37.8-11FE-1 DC24V 1.6A
VOGELE-0002
S-Nr：4.54.04.2/4049
UNITEC-0022
TIPO &UN/PR5
WALDRICH-0139
DU/BUSH,2/5550500,MB/5040/DU,
WEIDMULLER-0070
VOGEL-0065
143 012 231
IL100/150-15/2
VICKERS-1823
VMP16G1002
WAYCON-0192
SERIE SX 量程：1250MM 24V供电
VICKERS-0601
RV3-16-S-0-50
VOGEL-0047
Type：212.20.100
VICKERS-0276
PVBQA20-LS-22-C-11-PRC
WHITE-0019
VOGEL-0263
355 055 555
VICKERS-2333
FT-257/1-14 &BAR400
WENGLOR-0523
SG4-301E135C1
VISHAY NOBEL-0063
KOSD40/20KN
VICKERS-1379
C2-830UB 单向阀
WALDRICH-0189
FREEFLEXPIVOT
IE1-K21R 280S 4 LL TWS HW 75KW
K21R180L4 SPM TWS VL HW
WALTERSCHEID-0033
WF-WD16SVI &C型圈
VICKERS-0412
DG5V-10-H-6C-2-E-M-U-H-10
225SM2-09-
WALDRIGH-0001
PREINSTALPAIR+2.0HARDDISK
12NN-K5-N4-BIA 温度0～100℃
WALTER-0039
TYEP:SXE SERIE:9114/3
K21R 132S4 HW
WENGLOR-0466
111-132-104
VICKERS-0929
F6-DG17V4-016N-10
WERMA-0035
851.100.38/115VAC
VOGEL-2175
0.120KW 1320min-1 NM:60 21min
WENGLOR-0034
CP70QXVT80 光电开关及连接线
8WA1808连接器
VESTER-0011
VICKERS-1060
PVH74QPC-RBM-13S-10-C16-14-31
VANEL-0049
RESSORT DE COMPRESSION DE=6
VICKERS-0011
VICKERS DG5S-8-0A-E-W-D-20
VAISALA-0037
VICKERS-0123
VERSA-0130
VAG-2-D024
VALEO-0004
403.475 24V 20104
WEFORMA-0002
WP-M 0.25-3
VICKERS-1058
DG5S-8-31C-E-T-M-U-HL7-B-13-30
VICKERS-1651
KDG5V 5 33C60N40 X VM U H1 10
WILDEN-0032
T2 &02-1010-51
K21R &280 M4 LL HW &13 90KW
VIDEOJET-0077
VICKERS-2189
CVCS-25-N-B29-10
VALBIA-0010
DN150 PN1.0MPA 300N.M
VOGEL-2060
WVN715-RO4*0.85
VIBCO-0001
BV-250振动器
TE225SM-4 45KW B3/B5
WEIDMULLER-0147
WEIGEL-0374
FQ96 230V 45-50-55HZ
VICKERS-0046
CVCS-32-A-S2-W-10插装阀盖板
VOITH-0103
M18*1.5 125C
VOITH-0256
用在R17K500M里面的油泵
VOGEL-2082
MFE2-S13-140
VOGEL-2086
SP/SMB3A2E2/370
DSF500L192-6 890KW 660V 915A
WELWYN-0003
WDBR 5L 25RKI
K21F 80K 4WIS IL TPM140/0405
VOGEL-1964
MKU2-KW3-22011
WIRTH-0004
PROP.WAY VALVE SLF3-A2H25/25/E
VICKERS-2350
PVH131QIC-RSF-13S-10-C25-31
WETRON-0026
WTS 35 FA/HA
VICKERS-1387
PVQ20-B2R-SE1S-21-C21-12-S2
VAHLE-0017
KDS 2/40-8-14/168086
VOGEL-1575
DS-W20-2-V57 24V
WATTSREGULATOR－0001
FS10-C &120V &7.4AMP
VIBRO-0138
APF 196 P/N957.07.21.2002
VIBRO-0142
VIEGA-0003
Model: 22999
UNILUX-0080
S10-9072-02　
WENGLOR-0247
VOITH-0138
WSR-D16118
WENGLOR-0485
光纤放大器 ODX202P0007
UNIOP-0023
WEBER-0330
VICKERS-0551
PVM081 ER10ES02AAA AOA
HPU4-20MA ITEM NO:182170
WATANABE-0028
HLE45-1024H-3F.AC编码器
VOGEL-0411
VIDEOJET-0003
RS1A23D25 IN220VAC OUT4032VDC
UNISONINDUSTRIES-001
VOITH-0238
IPC-7-250-111
NW5030YC-C02ID-AAI=119
WAYCON-0013
SX-50-500-420A-SA-00(IP67)
ULVAC-0112
WALDRICH－0067
752.490-62
ULVAC-0368
BEFTM401 油雾过滤器
VICKERS-2236
DG4V-5-2AJ-M-U-H6-20带灯插头
VIGORGEAR-0002
PG-50 I:1/30 STEDL2
VOGEL-0211
UNIPULSE-0009
WALTER-0016
AT-002 标准型（中套）
WEISHAUPT-0105
WEIDMULLER-0218
HDC 04A KOLU 1M20G
UNIVER-0019
BE-5940 &BE-5700
VOITH-0156
366TV*+EEK180M&55H7/&40H7
WARNER-0041
ERS-68 P/N:
CL66.XXNGSHAMXX(l=4.2m)
WAGNER-0040
colora 20040BURAGOM-MIL ANITAL
2649ABYN00022AD2-AR1
WALTER-0014
WELL72.XMDX4P13CT L= 30m
WAGNER+GRIMM-0012
typ EE2760 NR.60337
VICKERS-0228
DG4V-5-2AJ-MU-H6-20
MN-BSE-250LM-16-32V1 0-AIND-C
VICKERS-1749
DG4S-5-2A-W-T-11
WEIGEL-0149
AIU2.2 输入0-1A（48-62HZ）
VICKERS-1433
DG4S4-012C-UD-60
型号：26420 &技朮规格：PN25MPA
PA 6.0 O2 S ZR 只要配套的硬质
WICHITA-0038
6 018 300 101 0999
WEIGEL-0321
PI36DC CONNECT3 FOR 24-90V
VISHAY-0107
REC139L36E & 900MM
K21R 280M 4 TWS LL
WALTHER-0142
SP-009-0-WR017-21-4
WARNER-0095
P/N:70-723400 & REV-1
VOITH-0128
压力开S-10/GD A4+A-A-1 0-6BAR
EN837-1 0-6BAR &接口材质 316L
VENTAPP-0002
serial no:
UNICO-0150
VICKERS-0868
PVXS-066M02RAD
433.50-E-BG410Z-FS-TT-CSZ-ZZZZ
WEBER-0342
NH GR 00 125A
184.076000 NO & 30 bar 0 0876
WEBER-0396
订货号624850
UNI-GERATE-0020
MRK Ma125-U-550-2.15.32
VOGEL-1682
TPY:H2 I=1.0 &ID:205701
WAYCON-0010
SX-50-500-420A-SA-IP67
VICKERS-1233
DG4V-2-6C-M-U-H6-10
B21R 90 L4 STR EL230
VISHAY-0141
REC 38 L 3 C（或D）102
WEIDMULLER-0148
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本产品网址：/b2b/sh_xuanang/sell/itemid-.htmlMost books aren’t printed on 8 1/2 x 11 paper so why are these the standard paper dimensions? Paul Stanley :
…we have ended up with paper sizes that were never designed or adapted for printing with 10-12 point proportionally spaced type. They were designed for handwriting (which is usually much bigger) or for typewriters. Typewriters produced 10 or 12 characters per inch: so on (say) 8.5 inch wide paper, with 1 inch margins, you had 6.5 inches of type, giving … around 65 to 78 characters: in other words something pretty close to ideal. But if you type in a standard proportionally spaced font (worse, in Times — which is rather condensed because it was designed to be used in narrow columns) at 12 point, you will get about 90 to 100 characters in the line.
The standard paper dimensions are thus not optimized for reading using printed fonts so typographers try to make adjustments. One adjustment is to abandon the standard paper size which is what books do. Another is to make the margins very wide which is the Latex default.
[Another] answer — which is what most wordprocessors did — was to stick to the standard “document design” (margins of an inch or so) and just use proportionally spaced fonts as if they were typewriter text. This produces very long lines, which are not comfortable to read. But that discomfort can be somewhat alleviated by increasing the space between lines (1.5 or double space), which helps prevent “doubling”, and by avoiding type sizes below about 11 or 12 points (depending very much on the design of the font).
Another possibility is to use the margins for marginalia, which I like. (Stanley points to the Latex
as a way to do this.) One could also a two-column format or just make the text bigger.
Stanley concludes:
These are all potentially valid design choices. I happen to think that the most conventional one (stick with 1 inch margins, and add line spacing to prevent doubling) is probably the worst of them, and that it only seems “right” because we are accustomed to it. And it doesn’t generally save paper, because unless you use single spacing you lose vertically the extra space that you gain horizontally.
We need to fix this problem. Now is the time for a margin revolution.
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