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MV-D752-28  User’s Manual 

 

 

 

 

 
 

REV: 1.0 

      Page 20/61 

7

 

Variation of the amplification 

 

The MV-D752-28 camera contains several possibilities for amplifying the video signal. On 
the one hand the CMOS sensor can be operated in skim mode, corresponding to a non-

linear amplification. In this mode low intensities are amplified more strongly than high 
intensities (small signal amplification). The resulting response is similar to a gamma 

correction. Fig. 10 shows an example of sensor response for a fixed skim voltage in 
comparison with the linear response of the sensor. The right hand figure represents a 
zoom of the lower intensity region. The small signal amplification is the relation between 

the sensor output voltages of both modes at constant low illumination. The skim voltage 
can be varied via DAC channel 3 in the voltage range 0 – 4V (see Appendix E). An 

unsuitable choice of parameters can lead to image lag with high contrast scenes, 
resulting in smearing of the image and reduced image quality. A skim voltage of 1.4V, 

corresponding to a small signal amplification of about 2, turns out to be a reasonable 
value in practice. 

In Skim mode, please note: 

Exposure time <10ms; LinLog voltage < 1V. To 

increase the shutter efficiency a LinLog value of 25 should be used! 

Furthermore, 

when using this mode constant frame time the frame time should be set to a value that 
allows the sensor a reset time of at least 10 

µ

s. 

 
 

Fig. 10:  Sensor response in Skim mode compared with linear response 

 
On the other hand, it is possible to switch the amplification of the video amplifier of the 

sensor module between amplification factors 1 and 4 by activating bit 7 register 7. The 
offset correction for the amplifier must then be adjusted. If option EN_TOGGLE bit 4 

register 6 is activated, the switch occurs automatically. In this case switching occurs 
between two preset offset values. If the automatic offset correction is deactivated, the 

user is responsible for suitably adjusting the correction. This is achieved for every 
operating mode by adjusting the video signal offset via DAC channel 5 (see Appendix E). 

Moreover, in the 8-bit output mode of the camera, digital amplification factors 2 and 4 
can be set using bit shift operations. For this purpose, the two LUTs have been factory 
pre-programmed (see Appendix B). It is important to note that, when using these LUTs 

with a maximum gray level value of 255, the LinLog

TM

 modes perform a compression of 

the upper gray level values and the contrast improvement cannot be attained with the 

pre-programmed LUTs. By suitably adjusting the LUTs, non-linear responses can be 
realized, allowing the gray level range of interest to be spread to suit the application. 

Moreover, response ranges of the LinLog

TM

 modes can also be transferred to the 8-bit 

output resolution. 

 

Содержание MV-D752-28

Страница 1: ...MV D752 28 CMOS area scan camera Camera User s Manual REV 1 0...

Страница 2: ...ic CMOS sensors LinLogTM Technology was recognized with the Stuttgart Vision 2000 prize for innovation and more recently the Photonics Award of Excellence With these technologies blooming and smear be...

Страница 3: ...e 9 10 2 7 Registers 18 20 for LinLog2 9 10 2 8 Registers 21 23 Frame time 9 10 2 9 Registers 24 31 ROI 9 10 2 10 Register 32 Line pause 9 10 2 11 Calculation of Frame time 9 10 2 12 Register 33 Line...

Страница 4: ...9 23 Revisions and State of Product development 9 23 1 Revisions 9 23 2 State of Product development 9 24 Service information 9 24 1 Contact for product enquiries and quotations 9 24 2 Product informa...

Страница 5: ...nfiguration needs no external control signals to acquire images The integration time and the read out window ROI are pre programmed in the camera via the configuration interface and can be changed by...

Страница 6: ...8 bit Dynamic range in LinLogTM Mode 120 dB Analog amplification 1 or 4 Spectral range 400 nm 900 nm see Fig 1 Optical Fill factor 35 Data interface LVDS and CameraLink Data resolution 10 bit 8 bit or...

Страница 7: ...MV D752 28 User s Manual REV 1 0 Page 7 61 2 Mechanical Dimensions The Front plate is compatible with the Microbench System of LINOS AG www linos de MB2002 Interface Camera Link 46 Interface L VDS...

Страница 8: ...ELD Shield 2 O N_XD0 Negative LVDS Output CameraLink DataD0 3 O N_XD1 Negative LVDS Output CameraLink DataD1 4 O N_XD2 Negative LVDS Output CameraLink DataD2 5 O N_XCLK Negative LVDS Output CameraLink...

Страница 9: ...ig 2 Connector socket Nr 09 0408 90 03 for the voltage supply Table 5 Data bit assignments for the 8 bit configuration Data bit CameraLink Port and bit LSB A0 LSB 1 A1 LSB 2 A2 LSB 3 A3 LSB 4 A4 LSB 5...

Страница 10: ...e pin assignments for the LVDS interface of the Photonfocus camera series The interface definition contains the following 16 data signals 8 handshake signals for camera control by the frame grabber an...

Страница 11: ...GND Ground 30 PW GND Ground 31 O NDATA1 Negative LVDS Output Data bit 1 32 O NDATA3 Negative LVDS Output Data bit 3 33 O NDATA5 Negative LVDS Output Data bit 5 34 O NDATA7 Negative LVDS Output Data b...

Страница 12: ...ATA13 PDATA15 NDATA15 GROUND GROUND VDD VDD RX_RS232 TX_RS232 GROUND GROUND VDD VDD VDD2 VDD2 12 11 10 9 8 7 57 56 55 40 54 39 53 38 52 37 51 36 50 35 49 34 48 33 47 32 46 31 6 5 4 3 2 1 15 14 13 59 5...

Страница 13: ...ut can be interrupted by a new trigger In this mode the user should ensure that the trigger rate and the frame rate correspond Fig 4 illustrates the function of the parameter constant image data rate...

Страница 14: ...f the image information begins afresh The data are output on the rising edge of the pixel clock The signals FRAME_VALID FVAL and LINE_VALID LVAL mask valid image information The signal SHUTTER indicat...

Страница 15: ...at of the frame grabber by means of the flag POLARITY_SYNC_EXPOSURE bit 3 mode register 3 The data are output on the rising edge of the pixel clock The signals FRAME_VALID FVAL and LINE_VALID LVAL mas...

Страница 16: ...EXSYNC signal can be matched to that of the frame grabber by means of the flag POLARITY_SYNC_EXPOSURE bit 3 mode register 3 The image is read out after the exposure time has elapsed After readout the...

Страница 17: ...grabber by means of the flag POLARITY_SYNC_EXPOSURE bit 3 mode register 3 The image is read out after the exposure time has elapsed After readout the sensor returns to the reset state and the camera...

Страница 18: ...Falling Edge of signal Polarity TRIGGER START EXPOSURE START EXPOSURE STOP EXSYNC Mode internal exposure time via Register 1 FE_EXSYNC FE_EXSYNC EXPOSURE_END 1 RE_EXSYNC RE_EXSYNC EXPOSURE_END EXSYNC...

Страница 19: ...ponse can be smoothly adjusted and is continuously differentiable This setting is achieved via DAC channel 4 in the voltage range 0 4V see Appendix E For many applications the logarithmic compression...

Страница 20: ...onstant frame time the frame time should be set to a value that allows the sensor a reset time of at least 10 s Fig 10 Sensor response in Skim mode compared with linear response On the other hand it i...

Страница 21: ...I the restriction described above can be removed by deactivating the pre load of line addresses This is achieved by deactivating bit 5 of mode register 3 address 0DH i e set EN_PRELOAD 0 and also sett...

Страница 22: ...0 581 751 581 X0_ROI Y0_ROI X1_ROI Y0_ROI X1_ROI Y1_ROI X0_ROI Y1_ROI Fig 12 A single ROI bounded by X0_ROI Y0_ROI and X1_ROI Y1_ROI 64 Pixels valid ROI Line pause 8 EN_PRELOAD 1 valid ROI Line pause...

Страница 23: ...rances of the centering of the optical axis on the sensor can be corrected For ideal centering of the optical axis of the camera on the sensor the following values of X_OFF and Y_OFF are used X_OFF 10...

Страница 24: ...ode 8 bit resolution and linear response An example of initial sensor control values is summarized in Table 27 Since every camera is individually set up before delivery parameters will vary from those...

Страница 25: ...djust camera modes 15 F R W LSB Exposure Time 16 10 R W MSB 1 Exposure Time 17 11 R W MSB Exposure Time 18 12 R W LSB LinLog Time 19 13 R W MSB 1 LinLog Time 20 14 R W MSB LinLog Time 21 15 R W LSB Fr...

Страница 26: ...sed 46 2E Not used 47 2F R W Choice of a RAM bank for read write access 48 30 R W Byte0 of a 16x8 RAM Bank 49 31 R W Byte1 of a 16x8 RAM Bank 50 32 R W Byte2 of a 16x8 RAM Bank 51 33 R W Byte3 of a 16...

Страница 27: ...rror bits in status register 4 can be reset by writing a logical 1 to the corresponding bit The definitions of the individual bits of these registers are summarized in Table 11 and Table 12 Bit 0 and...

Страница 28: ...a in operation 1 1 ENABLE1 Invert Pixel Clock 1 phase shift of 180 degrees 0 2 ENABLE2 0 3 ENABLE3 These bits are responsible for resolution access to the LUT s and the LFSR interface test 0 4 EN_TOGG...

Страница 29: ...d not be set in this mode Bit 7 register 6 activates the LinLog mode It is used by the internal state machines to generate the LinLog characteristic Consequently this value toggles between 0 and 1 whe...

Страница 30: ...e Description Voltage range V 0 VB1 External force VB1 pixel bias 0 6 0 8 1 VB2 External force VB2 column bias 2 0 2 4 2 VB3 External force VB3 output bias 0 7 0 9 3 VSH Shutter voltage 0 0 4 0 4 VLOG...

Страница 31: ...of a line 0 7 EN_HOLD_READOUT 1 enable HOLD function in development 0 Table 19 Mode register 4 register address REGADDR 14D 0EH Register address 14 MODE4_REG bit Name Description Default 0 SLAVE_ACTI...

Страница 32: ...n increments of the pixel clock 35 ns in case of the internal camera clock as both of the above time values The frame pause is used to keep the frame rate constant independent of the exposure time NOT...

Страница 33: ...u must match the frequency used A calculator for calculating frame rate is available at www photonfocus com 10 2 12 Register 33 Line jump and pixel jump This register contains the value for the interl...

Страница 34: ...rors can be identified in the complete image processing system LOG Mode Pure logarithmic mode the pixels function as simple photo diodes and are continuously exposed to the light source Because of the...

Страница 35: ...ble After accessing the ADC module the camera must be reset to slave mode where the external clock is used Table 22 Register 0 to 63 of the ADC module REG DEC REG HEX W or C Function during WRITE R Fu...

Страница 36: ...cause otherwise incorrect information will get into the internal camera register The PROM_BUSY state indicates an uncompleted writing cycle active memory load during write access to the EEPROM EEPROM...

Страница 37: ...LUT1 0 2 POWER_SAVE 1 power save mode ADC module 0 3 Not used 0 4 Not used 0 5 Not used 0 6 Not used 0 7 Not used 0 11 2 Instructions for control of the ADC Module Table 25 displays the defined comma...

Страница 38: ...ks It is imperative that no pressure be applied to the surface of the sensor or to the Globe Top surrounding the optically active surface during the cleaning process The use of pointed or sharp object...

Страница 39: ...ly the byte 00H is the factory setting in the EEPROM The factory settings contain all parameters which are needed for the operation of the camera after power up or reset Table 27 shows the EEPROM addr...

Страница 40: ...DAC0 Channel Register 6 W 11 8 10 Chan6_Ctl_MSB MSB DAC0 Channel Register 6 W 12 9 5A Chan7_Ctl_LSB LSB DAC0 Channel Register 7 W 13 8 10 Chan7_Ctl_MSB MSB DAC0 Channel Register 7 W 14 9 5E Chan0_Mai...

Страница 41: ...ter 3 R W 36 D 20 MODE4 7 0 Mode register 4 R W 37 E 00 EXPOSURE_TIME 7 0 LSB Exposure time R W 38 F E0 EXPOSURE_TIME 15 8 MSB 1 Exposure time R W 39 10 93 EXPOSURE_TIME 23 16 MSB Exposure time R W 3A...

Страница 42: ...BYTE5 7 0 No LinLog MSB LL2 R W 62 35 30 BANK0_BYTE6 7 0 Log Parameter LSB R W 63 36 F4 BANK0_BYTE7 7 0 Log Parameter MSB R W 64 37 31 BANK0_BYTE8 7 0 LinLog Parameter LSB LL1 R W 65 38 BC BANK0_BYTE9...

Страница 43: ...C0 Channel 2 Main register Base 0A LSB DAC0 Channel 2 Sub register Base 0B MSB DAC0 Channel 2 Sub register Base 0C LSB DAC0 Channel 3 Main register Base 0D MSB DAC0 Channel 3 Main register Base 0E LSB...

Страница 44: ...ues higher than 511 will be displayed as a gray values of 511 Clamping LUT1 contains a LUT with a digital amplification of 4 and a gray scale clamping of 255 Fig 13 shows the clamping of the initial v...

Страница 45: ...to the 8 bit RS232 limitation it is not possible to distinguish between data and address transfers The protocol in Table 31 is implemented to allow access to the 64 internal camera registers Table 31...

Страница 46: ...rite Low Data Nibble 5 4 TX 0000 0110 06 Successful receipt camera transmits ACK 06H 5 RX 1100 0101 C5 Write High Data Nibble 5 6 TX 0000 0110 06 Successful receipt camera transmits ACK 06H 7 RX 0100...

Страница 47: ...g is shown in Table 34 In order to be able to write to the EEPROM the write protection must be disabled The PROM_BUSY and the AUTOLOAD flag in the EEPROM register address 4 bit 1 or bit 0 must also be...

Страница 48: ...n register address 02H 4 Read status register address 04H wait for state not PROM_BUSY or AUTOLOAD 5 Write in register address 03H command SEND_PROM 6 Read status register address 04H wait for state n...

Страница 49: ...Table 37 Table 37 Individual control parameters BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 System control X 0 0 X X X X X 0 BIN PD SSTBY SCLR 0 X X Channel control X 1 0 A2 A1 A0 MX1 MX0 X X X STBY CL...

Страница 50: ...5A10 Active output external reference Vref 1 25V Channel register 7 5E10 Active output external reference Vref 1 25V The output voltage is determined by the following equation 4096 128 1024 512 875 1...

Страница 51: ...0100100 42 3C8 0001001111 74 0FF 1111111100 106 2BB 1101110101 11 126 0110010010 43 391 1000100111 75 1FF 1111111110 107 177 1110111010 12 24D 1011001001 44 323 1100010011 76 3FF 1111111111 108 2EF 11...

Страница 52: ...0100 142 17F 1111111010 174 291 1000100101 206 233 1100110001 238 14F 1111001010 143 2FF 1111111101 175 123 1100010010 207 067 1110011000 239 29F 1111100101 144 1FE 0111111110 176 246 0110001001 208 0...

Страница 53: ...Code signal REG STD_LOGIC_VECTOR 9 downto 0 signal DATAIN STD_LOGIC SR10R process ICLK 10 bit LFSR begin if ICLK event and ICLK 1 then if RESET 1 then reset shift register is loaded with 1 REG 000000...

Страница 54: ...MV D752 28 User s Manual REV 1 0 Page 54 61 19 Appendix G CE Test Compliance...

Страница 55: ...N 0 9651934 3 8 20 2 Files on the web server www photonfocus com AN001 Application note LinLog2 AN001 Photonfocus AG CLO2000 Specifications of the Camera Link Interface Standard for Digital Cameras an...

Страница 56: ...ss REGADDR 12D 0CH 9 Table 18 Mode register 3 Register address REGADDR 13D 0DH 9 Table 19 Mode register 4 register address REGADDR 14D 0EH 9 Table 20 Camera control commands 9 Table 21 Overview of the...

Страница 57: ...Diagram Free Running Mode 9 Fig 6 Timing Diagram Trigger Mode 9 Fig 7 Timing Diagram Trigger Mode with external edge triggered exposure control 9 Fig 8 Timing Diagram Sync Exposure Mode 9 Fig 9 Respon...

Страница 58: ...MV D752 28 User s Manual REV 1 0 Page 58 61 23 Revisions and State of Product development 23 1 Revisions Table 40 Document revisions REV Changes Date 1 0 First edition 30 07 03...

Страница 59: ...rmware revision camera serial number software revision and revision of the user manual This table indicates firmware documents and software revisions Table 41 Correlation between firmware software and...

Страница 60: ...amera from its packing and ensure that it is complete and undamaged If any damage has occurred during transport please immediately contact the transport company and your distributor The camera is deli...

Страница 61: ...of damage If the equipment is defective return it in the original packing and with a copy of the receipt to the following address Photonfocus AG Bahnhofplatz 10 CH 8853 Lachen Important Include a writ...

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