攝像頭與視頻算法處理ov6620中文

1、)OV6620 CMOSCIF 彩色OV6120 CMOSCIF 黑白頭頭特101376像素（352x288）,1/4棱鏡，CIF/QCIF格式數據格式：YCrCb4:2:2GRB4:2:2,RGBRawData(RGB原始數據8/16數據：CCIR601、CCIR656、ZV 端/5V 80)OV6620 CMOSCIF 彩色OV6120 CMOSCIF 黑白頭頭特101376像素（352x288）,1/4棱鏡，CIF/QCIF格式數據格式：YCrCb4:2:2GRB4:2:2,RGBRawData(RGB原始數據8/16數據：CCIR601、CCIR656、ZV 端/5V 80 SCCB可

2、編程（400kb/s）概OV6620(彩色)和 OV6120(黑白色)CMOS 圖像傳感器是單/352x288 SCCB(SerialCameraControl式4-、8-16-bit 、PC。第 1 2009-6-356x(176xGammaPixel9.0 x8.2Image3.1x2.5S/Noff,Gamma=MaxFrame/= =(forselectedDark0.2Scan Dynamicer5VDC,+-5VDCor80mW 30uW48pin)管腳*說明：UV0-UV7 輸出在 0V6120 中不可用。但是相應管腳上的其他功能依然有效管腳描第 2 2009-6-)管腳*說明：

3、UV0-UV7 輸出在 0V6120 中不可用。但是相應管腳上的其他功能依然有效管腳描第 2 2009-6-功能/陣列電源（缺省復位，（缺省 SCCB（缺省控制 0.1uF模擬電源)第 3 2009-6-（缺省 0.1uF1uF（缺省SCCB 模擬電源FODDHREF 輸出。在上電時，讀作B8ABKEN)第 3 2009-6-（缺省 0.1uF1uF（缺省SCCB 模擬電源FODDHREF 輸出。在上電時，讀作B8ABKENMIRBit4Bit3QCIFCC656GAMMAIO數字電源數字接口輸出緩沖電源CS0CS2SHARPCS1)第 4 2009-6-RGBG2XBit1CBAR)第 4

4、2009-6-RGBG2XBit1CBARCHSYNC 輸出。在上電時，作為取樣信號地電源ISCCBSCCB（缺省SCCB 使能多（8個）)1功能描（OV6120 不適用)1功能描（OV6120 不適用1.1 總1所示。OV6620/OV6120CMOS圖像傳感器方框圖如下，OV6620傳感器包356x292 8位模/數轉換器，模擬視頻復用器，數字數據格式器和 端口，SCCB接口和寄存器，數字控制包括時鐘模塊、曝 RG / GB 陣列。第 5 2009-6-)1.2 模擬信號產生電1.2.1 綜356 x 292 Y=0.59G+0.31R+0.11B U = R-YV = B- )1.2 模

5、擬信號產生電1.2.1 綜356 x 292 Y=0.59G+0.31R+0.11B U = R-YV = B- Y=0.59G+0.31R+0.11B Cr = 0.713 x (R- Y)Cb=0.564x(B-YCrCb/RGB（Raw Data）8 后發(fā)送到用戶所選 16-,8-或者 4-Y/RGB240CrCb峰值/RGB（Rawdata）(說明：0255 保留用于同步標志處不是非常亮的情況下，可以調整自控制（AEC）白24dB的場紅/第 6 2009-6-)1.2.3 窗口OV6620/OV6120 (像素)2x 2 356 )1.2.3 窗口OV6620/OV6120 (像素)2

6、x 2 356 x 292356 x 292OV6620/OV6120 改HREF 352 x 288。1.2.4 變端口PortOV6620/OV6120 圖像傳感器包含（ZV）變焦 ZV端口。ZV2.1變VSYNC ：垂直同步脈沖8.86MHz時。PCLK16bitY7:0 ：8UV7:0：8第 7 2009-6-)2 、所有的定時參數見13端流參數1.2.5 QCIF格減少一半。缺省的分辨率是 176 x 144 7-QCIF 數字輸出格式（YUV，開始行）8-QCIF 數字輸出格式（RGB 始行）輸OV6620/0V6120 輸出端提供了一系列輸出格式/許多不同的應用需求。表 2-)2

7、 、所有的定時參數見13端流參數1.2.5 QCIF格減少一半。缺省的分辨率是 176 x 144 7-QCIF 數字輸出格式（YUV，開始行）8-QCIF 數字輸出格式（RGB 始行）輸OV6620/0V6120 輸出端提供了一系列輸出格式/許多不同的應用需求。表 2-數字輸出格式，如下，指明了可用的輸出格式。這些格式用戶SCCB 接口（3.1 SCCB 總線協(xié)議格式）編程選擇。OV6620/0V6120 支持CCIR601 CCIR656 輸出格式如下配置（參見表3-4:2:2 格式16-bit4:2:2 （60/50HzCCIR601時序標準。參見316bit8-bit （Cb Y Cr

8、YUV4-4:2:28-bit4-bitnibble（輸出數據出現在 Y4-Y7。時鐘速率是黑/白模式正常輸出速度24704x288（在此模式下，OV6620/0V6120 的像素時鐘加倍輸出順序是見 OV6620/OV6120VSYNC，HREF ，PCLK ，FODD ，CHSYNCOV6620/OV6120圖像傳感器也可以編程提供16-bit/8-bit/4-bit格式的RGB原始數據的OV6620（見4（RGB）Y 通道輸出序列是 GRG UV BGB 8RGB在RGB 原始數據CCIR656 模式OV6620/OV6120 能夠確認SAV(Start of 開始)EAV(End of

9、 結束)HREF 束。因此，SAV EAV 改變有效像素窗口。8 位的RGB 原始數據在沒有SAV 和EAV 的信OV6620/OV6120YUV輸出格式上提供很大的靈活性。這些設備可以編程為標YUV 4:2:2U V序列可以交換。當交換時，UV通道的 16-bit 配置的輸出格式變成:-VUVU第 8 2009-6-)bit VYUOV6620/OV6120 8-bit Y)bit VYUOV6620/OV6120 8-bit YUYVY端口提供（pins34:41）UV端口是三態(tài)模式。數據16-bit 模式時一樣的。OV6620/OV6120 Y/UV RGB （MSBLSB）可以翻轉。Y

10、7-Y0Y7MSB，Y0LSB 1RGBCCI6568bit 。SAV和EAVHREF （沒有 VSYNC 和 CHSYNC）可能被使用2Y/UV8-bit 模式下有效。YYUYV3YUV格式，U/VUV通道輸出序列交換。16-bit V U V U；8-VYU4RGB格式，U/VB RRGB第 9 2009-6-)第 10 2009-6-)第 10 2009-6-)TclkOV662017.73MHz，)TclkOV662017.73MHz，Tclk112ns 16-bit輸出Tclk56ns8 - bit輸出。TsuHREF15ns;ThdHREF保持15ns。Figure3.PixelD

11、ataBus(YUV第 11 2009-6-)Tclk是像素時鐘周)Tclk是像素時鐘周期OV6620 17.73MHz 系統(tǒng)時鐘，Tclk = 112ns 16-bit 的輸出Tclk56ns8-bit的輸出。TsuHREF15ns;ThdHREF保持15ns。Figure4.PixelDataBus(RGB第 12 2009-6-)Y通道輸出 Y2Y3)Y通道輸出 Y2Y3Y6Y7Y10UVU2V3U6V7U10176144RGBYG0R1G4R5G8UVB0G1B4G5B8每行輸出一半的數據（176像素144YGYG0R1G4R5G8UVB0G1B4G5B8每行輸出一半的數據（176像素

12、144QCIFYY2Y3Y6Y7Y10UVU2V3U6V7U10每行輸出一半的數據（176像素144第 13 2009-6-)1.2.7模OV6620/OV6120傳感器可編程運行在從模式下（COMI6=1，默認情況下是主模式。HSYNC VSYNC )1.2.7模OV6620/OV6120傳感器可編程運行在從模式下（COMI6=1，默認情況下是主模式。HSYNC VSYNC 輸出信號。 （1）CLKXCLK1引腳水平同步信號，Hsync CHSYNC tivetiveassertion當工作在從模式下，OV6620/OV6120 CHSYNC（引腳 42）和 VSYNC（引腳 16）為三態(tài)輸

13、出引腳，可被用來作為輸入引腳。為了同步多個設備，OV6620/OV6120圖像傳感器使用外部系統(tǒng)時鐘 CLK，來同步外部水平同步信號 HSYNC，然后用來同步外部垂直幀同步號 Vsync。見圖 5-從模式外部同步時序1、Ths6*Tclk;ThsTvsTprTinTin時間設置方法是Ths(Figure6.Frameure第 16 2009-6-)v第 17 2009-6-)v第 17 2009-6-)2.電學特第 18)2.電學特第 18 2009-6-)（t8)（t8 第 19 2009-6-)（t8（2）在 VSYNC 下)（t8（2）在 VSYNC 下降沿之后，ov6620 將會輸出黑

14、色參考水平，行號是 Tvs，它是在 VSYNC下降沿之后的第一個 HREF 上升沿和第一個有效數據 CHSYNC 上升沿之間。接下來就是有效數據，然后又是黑色參考水平，行號是 Tve，它是在 VSYNC 上升沿后的第一個 CHSYNCCHSYNC 上升沿之間。黑色參考輸出行號由垂直窗口(vertical window )設置。（3在默認設置時，Tvs14*TlineVS7.0改變而改變。VS7:0 1（4Tve= 4 *TlineTve= 3 *TlineVE7.0 1第 20 2009-6-)第 21 2009-6-)第 21 2009-6-)3.SCCB總OV6620/OV6120 圖像傳

15、感器的許多功能和可配置寄存器可通過 SCCB 接口實現。 SCCB 端口可以通過SBB 管腳（pin 12）10K ohm 的電阻到VDD 來使)3.SCCB總OV6620/OV6120 圖像傳感器的許多功能和可配置寄存器可通過 SCCB 接口實現。 SCCB 端口可以通過SBB 管腳（pin 12）10K ohm 的電阻到VDD 來使能SCCB 啟用（SBB1）OV6620/OV6120400kbps的串行傳輸速率，使7位地址/數據傳輸協(xié)議。因此，OV6620/OV6120傳感器在寫周期前讀子地址。期內獲得連續(xù)的地址。多字節(jié)循環(huán)覆蓋原來的子地址;3.1SCCB總線格每一個字節(jié)，MSB 總是先

16、傳輸。讀/寫控制位是第一個字節(jié) LSB 位。協(xié)議要求在 SIO-1高電平期間 SIO-0 保持不變。只有在在 SIO-1 為低電平時，每個 bit 才允許改變。 因此，OV6620/OV6120 傳感器在寫周期前讀子地址。OV6620/OV6120 可以編程一個的8 位34）CS2:0OV6620/OV61208 配置。由 MULT（管腳 47）高電平時，該傳地址。MULTOV6620/OV6120 在寫周期，SCCB 總線上的第二個字節(jié)是子地址（subaddress）的子地址。讀未實現的子地址返回unknown。3.2 寄存 關于寄存器，還是不要翻譯了，以免小錯引大錯的為主第 22 2009

17、-6-)第 23 2009-6-)第 23 2009-6-AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL RegisterTheelowprovidesalistanddescriptionofableSCCBregisterscontained image sensor.heTable16.SCCB13MaySaturationSAT7:0saturationadjustment.“FFh”-highest,“00h”-Note:ThisAdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR

18、AND B/W DIGITAL RegisterTheelowprovidesalistanddescriptionofableSCCBregisterscontained image sensor.heTable16.SCCB13MaySaturationSAT7:0saturationadjustment.“FFh”-highest,“00h”-Note:ThisfunctionisnotavailableontheOV6120Image-ContrastCTR7:0contrastadjustment.“FFh”-highest,“00h”-BrightnessBRT7:0brightn

19、essadjustment.“FFh”-highest,“00h”-SharpnessSHP7:4Thresholdofsharpness.Range:080mV,Step:5mV SHP3:0 Sharpness control. Range: 0 8x, Step: 0.5x-AWB-WhiteBalanceBackground:BlueChannel ABLU7:6 - rsvdABLU5-Sign“0”-decreasebackgroundbluecomponent “1” - increase background blue componentABLU4:0-Whitebalance

20、blueratioNote:ThisfunctionisnotavailableontheOV6120ImageAGCGainGC7:6-unimplementedbit,returnsXwhenread. GC5:0StorageforthecurrentAGCGainThisregisterisupdatedautomatically.IfAGCisenabled,the ernalcontrolstorestheoptimal gainvaluehis register. IF AGC is not enabled, a “00” is storedhisregister.BlueGai

21、nBLU7“0”decreasegain,“1”increasegain. BLU6:0 blue channel gain balance value.Note:ThisfuncionisnotavailableontheOV6120ImageRedGainRED7“0”decreasegain,“1”increasegain. RED6:0 red channel balance value.Note:ThisfuncionisnotavailableontheOV6120ImageAdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIG

22、ITAL 13MayRAutomatic Exure Control AEC7:0 - Set exuretimeerlaced: Tex = Tline x AEC7:0 Progressive:Tex =Tline xAEC7:0 x2AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayRAutomatic Exure Control AEC7:0 - Set exuretimeerlaced: Tex = Tline x AEC7:0 Progressive:Tex =Tline xAEC7:0 x2RClock

23、RateCLKRC7:5 Sync output polarity selection “00”-HSYNC=Neg,CHSYNC=Neg,VSYNC=“01”-HSYNC=Neg,CHSYNC=Neg,VSYNC=Neg “10” - HSYNC=, CHSYNC=Neg, VSYNC= “11” - HSYNC=,CHSYNC=,VSYNC=CLKRC50ClockCLK=(CLK_main/(CLKRC5:0+1)x2)/CommonControlCOMA7 - SRST, “1” initiates soft reset. Initiate soft reset. All regist

24、ers are set to default val- uesandchipisresettoknowns eandresumesnormaloperation.Thisbitisautomatically cleared after reset.COMA6-MIRR,“1”selectsmirrorimage COMA5 - VSFR, “1” enables AGC,COMA4 - Digital output format, “1” selects 8-bit: Y U Y V Y U Y V COMA3 - Selectdataoutput:“1”-selectRGB,“0”-sele

25、ctYCrCb COMA2 - Auto White Balance “1” - Enable AWB, “0” - Disable AWB COMA1 - Color Bar Test Pattern: “1” - Enable color bar test pattern COMA0-Note:COMA3isnotprogrammableontheOV6120ImageCommonControlS COMS7:6-COMS5:4-Blackexpanding“00”-1.2V,“01”-1.26V,“10”-1.3V,“11”-COMS3:2-Sethighthreshold“00”-1.

26、9V,“01”-2.0V,“10”-2.1V,“11”-COMS1:0-Setlowthreshold“00”-1.3V,“01”-1.45V,“10”-1.5V,“11”-AWB-WhiteBalanceBackground:RedChannel ARED7:6 - rsvdARED5-Sign“0”-decreasebackgroundred“1”-increasebackgroundredABLU4:0-WhitebalanceredratioNote:ThisfunctionisnotavailableontheOV6120ImageCommonControlCOMR7-ogsigna

27、l2xgaincontrolbit.“1”-Additional2xgain,“0”-normal COMR6:0-AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayCommonControlB COMB7-COMB6COMB5-AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayCommonControlB COMB7-COMB6COMB5-Selectdataformat.“1”-Select8-bitformat,Y/CrCbandRG

28、Bismultiplexedto8-bit Y bus, UV bus is tri-s ed, “0” - Select 16-bit formatCOMB4-“1”-enabledigitaloutputinCCIR656COMB3 - CHSYNC output: “1” - Horizontal sync, “0” - comitesync COMB2 - “1” - Tris e Y and UV busses. “0” - enabothbusses COMB1 - “1” - Initiate single frame transferCOMB0-“1”-Enableautoad

29、justNote:COMB5isnotprogrammableontheOV6120ImageCommonControlC COMC7-COMC6COMC5-QCIFdigitaloutputformatselection.1-176x144;0-COMC4-Field/FrameverticalsyncoutputinVSYNCportselection:1-framesync,only ODD field vertical sync; 0 - field vertical sync, effect in erlaced modeCOMC3 - HREF polarity selection

30、: 0 - HREFitiveeffective,1-HREFnegaive. COMC2 - gamma selection: 1 - RGB Gamma on ; 0 - gamma is 1.COMC1COMC0Common Control D COMD7-COMD6-PCLKpolarityselection.“0”O(jiān)V6620outputdataatPCLKfallingedgeanddatabus will be stable at PCLK rising edge; “1” rising edge output data and stable at PCLK falling ed

31、ge. When OV6620 work as CCIR656 format, COMB4=1, this bit is disable and should use PCLK rising edge latch data bus.COMD5:1COMD0-UVdigitaloutputsequenceexchangecontrol.1-UVUV.for16-bit,UYVY. for 8-bit; 0 - V U V U . for 16Bit and V Y U Y . for 8 Bit.Note:COMD0isnotprogrammableontheOV6120ImageFieldSl

32、otFSD7:2 - Field erval selection. Odd Even mode defined by FD1:0 000000-disabledigitaldataoutput,onlyoutputblackreferencelevel. 000001 - divide to 2 slots, HREF iive one in every 2 field/frame 000010 - divide to 4 slots, HREF iive one in every 4 field/frame 000100 - divide to 8 slots, HREF iive one

33、in every 8 field/frame 001000 - divide to 16 slots, HREF iive one in every16 field/frame 010000 - divide to 32 slots, HREF iiveoneinevery32field/frame 100000-divideto64slots,HREFiveoneineveryFSD1:0-fieldmodeselection.Eachframeconsistsoftwofields:Odd&Even,thesebits defines the assertion of HREF in re

34、lation to the two fields.-OFFmode;HREFisnotassertedinbothfields,oneexceptionisthesingleframe transfer opera ion (see the description for the register 13)- ODD mode; HREF is asserted in odd field only. 10-EVENmode;HREFisassertedinevenfield11-FRAMEmode;HREFisassertedinbothoddfieldandevenfield.FD7:2Hor

35、izontalHREFHS7:0 - selects the starting po of HREF window, each LSB represents two pixels for CIF resolution mode, onxelsforQCIFresolutionmode,thisvalueissetbasedonan ernal column counter, the default value corresponds to 352 horizontal window. size is 356. see window description below. HS7:0 progra

36、mmable range is 38- EB, and shouldlessn HE7:0. HS7:0 should be programmable to value largern or equal to 38. Value largern EC is invalid. See window description below.HorizontalHREFHE7:0 - selectsing po of HREF window, each LSB represents two pixels for full resolution and onxelsforQCIFresolution,th

37、isvalueissetbasedonan ernalcolumn counter, the default value corresponds to the last availablxel. The HE7:0 programmable range is 39 - EC. HE7:0 should be larger han HS7:0 and lessnor equal to EC. Value largern EC is invalid. See window description below.VerticalLineVS7:0 - selects the starting row

38、of vertical window, in full resolution mode, each LSB represents1scanlineinoneframe.seewindowdescriptionbelow.Min.is03,max.is93 and should lessnVE7:0.VerticalLineVE7:0-selectsing row of vertical window, in full resolution mode, each LSB represents1scanlineinoneframe,seewindowdescriptionbelow.Min.is0

39、4,max.is94 and should largernVS7:0.AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayPixelPS7 0 - to provide a way to fine tune the output timing of thxel data relative totof HREF, it physically shifts thedata output time late in unit of pixel clock as shown figurebelow.Thisfunctionisd

40、ifferentfromAdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayPixelPS7 0 - to provide a way to fine tune the output timing of thxel data relative totof HREF, it physically shifts thedata output time late in unit of pixel clock as shown figurebelow.Thisfunctionisdifferentfromchangingthe

41、sizeofthewindowasisdefinedby HS7:0 & HE7:0 in register 17&18.n default number shifts thxelindelay(right)direction,thehighestnumberis “FF”.soum shift number is: Late: 256 pixels.RManufactureIDByte:MIDH7:0-readonly,alwaysreturns“7F”asmanufacturersIDRManufactureIDByte:MIDL7:0-readonly,alwaysreturns“A2”

42、asmanufacturersIDRRCommonControlCOME7-HREFpixelnumberselection.“1”-HREFinclude704PCLK,everydataoutput COME6COME5 - “1”rturecorrectionenable.Correctionstrengthwillbedecidedby register 07. “0” disablerturecorrection.COME4 - “1” Second stagerture correction enable. Correction strengndthreshold value wi

43、ll be decided by COMF7 COMF4.COME3 - AWB smart mode enable. 1 - Drop out pixel when comparxel red, blue and green component level to change register 01 and 02, which luminance level is higher presetting level and lowern presetting level, this two level is set by register 0F.0-calculateallpixelstoget

44、AWBresult.ValidonlywhenCOMB0=1andCOMA2=1 COME2 - AWB stop when field/frame image average luminance level is lowernapresettinglevelenable.1-enablestopAWBwhenimageluminancelevelislow.0-AWBis independentwithfield/frameluminancelevel.ValidonlywhenCOMB0=1andCOMA2=1. Average compare level is set by GAM7:5

45、.COME1 - AWB fast/slow mode selection. “1” - AWB is always fast mode,t is register 01 and02ischangedeveryfield/frame.“0”AWBisslowmode,01and02changeevery16/ 64 field/frame decided by COMK1. When AWB enable, COMA2=1, AWB is working as fast mode at1024field/frame,n as slow mCOME0-Digitaloutputdrivercap

46、abilityincreaseselection:“1”Doubledigitaloutputdriver current; “0” low output driver current s us.Note:COME3(AWBSmartMode),COME2(AWBStop),andCOME1(AWBFast/Slow)are not programmable on the OV6120 Image Sensor.YChannelOffsetYOFF7-Offsetadjustmentdirection0-AddY6:0;1-SubstrateYOFF6:0 -Y channel digital

47、 output offset adjustment. Range: +127mV -127mV. If COMG2=0,thisregisterwillbeupdatedby ernalautoA/DBLCcircuit,andwriteavalue tothisregisterwithSCCBhasnoeffect.IfCOMG2=1,Ychanneloffsetadjustmentwilluse the register stored value which can be changed by SCCB. If COMF1=0, this register hasadjustmenteff

48、ecttoA/Doutputdata.IfoutputRGBrawdata,thisregisterwilladjustR/G/B UChannelOffsetUOFF7: - Offset adjustment direction: 0 - Add U6:0; 1 -Substrate U6:0. UOFF6:0-Uchanneldigitaloutputoffsetadjustment.Range:+128mV-128mV.COMG2=0,thisregisterwillbeupdatedby ernalautoA/DBLCcircuit,andwriteavalue tothisregi

49、sterwithSCCBhasnoeffect.IfCOMG2=1,Uchanneloffsetadjustmentwilluse the register stored value which can be changed by SCCB. If COMF1=1, this register hasno effecttoA/Doutputdata.IfoutputRGBrawdata,thisregisterwilladjustR/G/BNote: ThisfunctionisnotavailableontheOV6120Image REFC7:6 - Select different cr

50、ystal circuiterlevel(11=minimum). REFC5:4-REFC3:0:ReferenceVoltagerangeselection.2.5V-3.5VandsAutomaicureControl:BrightPixelRatioAEW7:0 - Used as calculate bright pixel ratio. OV6620 AEC algori hm is count whole field/ frame bright pixel (its luminance level is highern a fixed level) and black pixel

51、 (its luminance level is lowernafixedlevel)number.Whenbright/blackpixelratioissameas theratiodefinedbyregister25and26,imagestable.Thisregisterisusedtodefinebright pixel ratio, default is 25%, each LSB represent step: 1.3% Change range is: 01 CA; Increase AEW7:0 will increase bright pixel ratio. For

52、same light condition, the image brightness will increase if AEW7:0 increase.Note:AEW7:0mustcombinewithregister26AEB7:0.Therelationmustbeas AEW7:0 + AEB7:0 CA.AdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayAdvancedTECHNOLOGIES, SINGLE IC CMOS COLOR AND B/W DIGITAL 13MayAutomaticureCo

53、ntrol:BlackPixelRationAEB7:0 - used as calculate black pixel ratio. OV6620 AEC algorithm is count whole field/ frame bright pixel (its luminance level is highern a fixed level) and black pixel (its luminance level is lowernafixedlevel)number.Whenbright/blackpixelratioissameas theratiodefinedbyregist

54、er25and26,imagestable.Thisregisterisusedtodefineblack pixel ratio, default is 75%, each LSB represent step: 1.3%; Change range is: 01 CA; Increase AEB7:0 will increase black pixel ratio. For same light condition, the image brightness will decrease if AEB7:0 increase.Note:AEB7:0mustbecombinedwithregi

55、ster25Therelationmustbeas follows: EW7:0+AEB7:0CommonControlCOMF7:6-rturecorrectionthreshold00-Differenceofneighborpixelluminanceisn8mV,correction01- 1610- 3211- 64COMF5:4-rturecorrecionstrength00and01-Strengthis50%ofdifferenceofneighborpixelluminance. 10 - 100%.11-COMF3-UVBLCswap.“1”swap;“0”noCOMF2

56、-DigitaldataMSB/LSBswap.“1”LSB-Bit7,MSB-Bit0;“0”normal. COMF1 - “1” A/D Black level calibration enable. “0” Disable A/D BLC.COMF0 - “1” Output4lineblacklevelbeforevaliddataoutput.HREFnumberwill increase 4 relatively. “0” no black level output.CommonControlG COMG7-COMG6COMG5 - Select CKOUT pin output

57、 V flag. 1 - CKOUT output V flag signal. CKOUT=1, meansrelatedUVchanneloutputVcomponent(orRedcomponent),CKOUT=0po edto U component (or Blue component). 0 - CKOUT output buffered XCLK2COMG4COMG3COMG2-“1”A/Doffsetadjustmentmanuallymodeenable:1-A/Ddatawillbeadd/substrate avaluedefinedbyregister21and22,

58、whichcontentiswrittenbySCCB.0-A/Ddataadded/substrateavaluedefinedbyregister21and22,whichisupdatedby ernal COMG1-Digitaloutputfullrangeselection.OV6620outputdatavaluerangeis10-F0,if COMG1 -1, range change to 01 - FE with signal overshoot and undershoot level.COMG0CommonControlCOMH7:-“1”selectsOne-Lin

59、eRGBrawdataoutputformat,“0”selectsnormaltwo-lineRGB raw data output, effective only in Progressive Scan mode.COMH6: - “1” enablack/White mode. When OV6620 working as BW camera, its vertical resolution will be highern color mode. At this mode, cant set OV6620 working at 8 bit outputmode.OV6620outputd

60、ataYUV/RGBfromYport.UVportwillbetri-s e.COMB5 and COMB4 will be set to “0”. “0” normal color mode.COMH5:COMH4:-FreezeAEC/AGCvalue,effectiveonlywhenCOMB0=1.“1”-register00and10 will not be updated and hold latest value. “0” - AEC/AGC normal working s us.COMH3: - Aisable.1-whenCOMB0=1andCOMA5=1, ernalc