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bdev:2dreader [2020/11/13 00:13]
richard 		bdev:2dreader [2021/08/16 22:22] (current)
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 When running the camera for 2D matix code reading and (likely dealing with different types of plates in general), depending on the environment and type of plate, you should be prepared to adjust the variable to assure the image is still in focus and there is sufficient lightly. There are at least 3 variables to consider in order to get good quality images for 2D matrix code reading:  When running the camera for 2D matix code reading and (likely dealing with different types of plates in general), depending on the environment and type of plate, you should be prepared to adjust the variable to assure the image is still in focus and there is sufficient lightly. There are at least 3 variables to consider in order to get good quality images for 2D matrix code reading: 
- +  
-Correct lighting - the LEDs underneath the plate are run by 12V power supply, there is a voltage controller that adjusts the voltage from 11.5V to 12V. Its not much of a range but the LEDs turn off below 11.5V. There are 3 settings if you are in a bright room you probably need the lowest setting but this also depends on how bright you want the camera to be which leads to the next setting.  +  - Correct lighting - the LEDs underneath the plate are run by 12V power supply, there is a voltage controller that adjusts the voltage from 11.5V to 12V. Its not much of a range but the LEDs turn off below 11.5V. There are 3 settings if you are in a bright room you probably need the lowest setting but this also depends on how bright you want the camera to be which leads to the next setting.  
- +  - Brightness - the camera is run by the picamera library - https://picamera.readthedocs.io/en/release-1.13/. This is a programmable setting that is used in the camera optimization script.  
-Brightness - the camera is run by the picamera library - https://picamera.readthedocs.io/en/release-1.13/. This is a programmable setting that is used in the camera optimization script.  +  - Focus - This is controlled by the Arducam,  enable_i2c_vc.sh that comes with the github package- https://github.com/ArduCAM/RaspberryPi - Connect to preview 
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-Focus - This is controlled by the Arducam,  enable_i2c_vc.sh that comes with the github package- https://github.com/ArduCAM/RaspberryPi - Connect to preview +
  
 So how this works is that you have a “Driver” computer that sends commands to the 2 RaspberryPi computers “Client”, each running the Arducam focusing camera. Initially I tried to just use ssh and have the clients share the Driver public key (the recipe for sharing keys on windows is here: VisionTracker Legacy 2D matrix scanner )but the focusing feature was not working. So now the Clients are both MQTT subscribers and the Driver is the MQTT publisher.  So how this works is that you have a “Driver” computer that sends commands to the 2 RaspberryPi computers “Client”, each running the Arducam focusing camera. Initially I tried to just use ssh and have the clients share the Driver public key (the recipe for sharing keys on windows is here: VisionTracker Legacy 2D matrix scanner )but the focusing feature was not working. So now the Clients are both MQTT subscribers and the Driver is the MQTT publisher. 
bdev/2dreader.1605226416.txt.gz · Last modified: 2021/08/16 22:21 (external edit)

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