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autofocus_standalone [2016/09/07 15:12]
asiadmin ↷ Page moved from documentation:autofocus_standalone to autofocus_standalone
autofocus_standalone [2016/10/04 15:13] (current)
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-[{{ :​documentation:​af_stand1.png?​direct&​300 |Figure 1: ASI Video Auto-focus card Block Diagram}}] ​+[{{ af_stand1.png?​direct&​300 |Figure 1: ASI Video Auto-focus card Block Diagram}}] ​
  
  
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   * Dual I2C controlled digital pots control the circuit gain at two locations in the signal chain to allow for large dynamically variable visual scenes. On board I2C address ''​0x5A (0101110x)''​.   * Dual I2C controlled digital pots control the circuit gain at two locations in the signal chain to allow for large dynamically variable visual scenes. On board I2C address ''​0x5A (0101110x)''​.
  
-[{{ :​documentation:​af_stand3.png?​direct&​300 |Figure 2: Autofocus Card IOs}}]+[{{ af_stand3.png?​direct&​300 |Figure 2: Autofocus Card IOs}}]
  
  
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 Please refer to the AD5252’s manual for details on communication with the IC. Please refer to the AD5252’s manual for details on communication with the IC.
  
-[{{ :​documentation:​af_stand4.png?​direct&​300 |Figure 3: I2C write and read patter from AD5252 datasheet}}]+[{{ af_stand4.png?​direct&​300 |Figure 3: I2C write and read patter from AD5252 datasheet}}]
  
 Connecting a monitor to the Monitor out of the autofocus card shows the sampled video as a highlighted rectangle. Two mechanical trim potentiometers are provided to let the user centering the sampled video. ​ Connecting a monitor to the Monitor out of the autofocus card shows the sampled video as a highlighted rectangle. Two mechanical trim potentiometers are provided to let the user centering the sampled video. ​
  
-[{{ :​documentation:​autofocus_video.png?​direct&​300 |Figure 4: Output of Mon Out, Video Sampling shown}}]+[{{ autofocus_video.png?​direct&​300 |Figure 4: Output of Mon Out, Video Sampling shown}}]
    
  
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 The second channel/​potentiometer controls the amplitude of the video signal applied to the focus signal extractor circuitry. During normal operation RDAC3 register is written with ''​0xFF'',​ to let all the video signal pass, but during calibration this channel is set to ''​0x00'',​ to help in setup of zero adjust potentiometer of channel one.  The second channel/​potentiometer controls the amplitude of the video signal applied to the focus signal extractor circuitry. During normal operation RDAC3 register is written with ''​0xFF'',​ to let all the video signal pass, but during calibration this channel is set to ''​0x00'',​ to help in setup of zero adjust potentiometer of channel one. 
  
-[{{ :​documentation:​af_stand5.png?​direct&​300 |Figure 5: Video Gain arrangement}}]+[{{ af_stand5.png?​direct&​300 |Figure 5: Video Gain arrangement}}]
    
 ==== ADC ==== ==== ADC ====
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-[{{ :​documentation:​af_stand6.png?​direct&​300 |Figure 6: I2C reading pattern from ADS1000 datasheet}}]+[{{ af_stand6.png?​direct&​300 |Figure 6: I2C reading pattern from ADS1000 datasheet}}]
  
 ===== ASI’s Focusing Routines ===== ===== ASI’s Focusing Routines =====
  
-[{{ :​documentation:​autofocus_scan.png?​direct&​300 |Figure 7: ASI’s Focusing Routine, scan showing a stage’s focus-axis position in tenths of microns, and the focus signal and filtered focus signal (focus-value)}}]+[{{ autofocus_scan.png?​direct&​300 |Figure 7: ASI’s Focusing Routine, scan showing a stage’s focus-axis position in tenths of microns, and the focus signal and filtered focus signal (focus-value)}}]
    
  
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 Before shipping, ASI uses a series of test video patterns to test and calibrate the cards. ​ Before shipping, ASI uses a series of test video patterns to test and calibrate the cards. ​
  
-[{{ :​documentation:​af_stand7.png?​direct&​300 |Figure 8: Test video patterns}}]+[{{ af_stand7.png?​direct&​300 |Figure 8: Test video patterns}}]
    
  
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   * Turn off any Automatic Gain Control (AGC) settings on your video system and use a Manual or Fixed Gain setting instead.   * Turn off any Automatic Gain Control (AGC) settings on your video system and use a Manual or Fixed Gain setting instead.
   * The illumination might be insufficient;​ increase the lighting on your sample.   * The illumination might be insufficient;​ increase the lighting on your sample.
-  * Limiting the background might help; decrease the width of the actively sampled video as described in [[documentation:​autofocus_standalone#​Video Sampling|Video Sampling section]]+  * Limiting the background might help; decrease the width of the actively sampled video as described in [[autofocus_standalone#​Video Sampling|Video Sampling section]]
  
 == Focus signal ramps up and saturates (5Volts for analog signal, 2047 if read digitally through ADC)when the sample is motionless and the focus controller is quiescent. == == Focus signal ramps up and saturates (5Volts for analog signal, 2047 if read digitally through ADC)when the sample is motionless and the focus controller is quiescent. ==
  
  
-This problem occurs when the Zero Potentiometer (First channel of 2nd potentiometer) is incorrectly set.  This can be corrected by calibrating the potentiometer again as described in [[documentation:​autofocus_standalone#​Settings Zero Adjust|Settings Zero Adjust section]]+This problem occurs when the Zero Potentiometer (First channel of 2nd potentiometer) is incorrectly set.  This can be corrected by calibrating the potentiometer again as described in [[autofocus_standalone#​Settings Zero Adjust|Settings Zero Adjust section]]
  
 == Focus signal is saturating (5Volts for analog signal, 2047 if read digitally through ADC) == == Focus signal is saturating (5Volts for analog signal, 2047 if read digitally through ADC) ==
  
-Try reducing the width of actively sampled video as described in section [[documentation:​autofocus_standalone#​Video Sampling|Video Sampling section]]. Or try reducing the amount of video signal applied to focus signal generator circuitry as described in [[documentation:​autofocus_standalone#​Video Gain|Video Gain section]]+Try reducing the width of actively sampled video as described in section [[autofocus_standalone#​Video Sampling|Video Sampling section]]. Or try reducing the amount of video signal applied to focus signal generator circuitry as described in [[autofocus_standalone#​Video Gain|Video Gain section]]
  
  
 {{tag>​manual autofocus}} {{tag>​manual autofocus}}
autofocus_standalone.txt · Last modified: 2016/10/04 15:13 (external edit)