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Assumptions
The Image Aquisition System will be a payload on the BenchBot, and can rely on the BenchBot meeting its stated requirements.
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Another way to increase the applied light onto the plants is by changing the flash distance. As it is setup today, the flash is 1.65 meters above the potting area to provide a close to even illumination of the plants within the allowable supported plant heights. As a flash distance is decreased, more light will be applied to the potted plants, but the light distribution from the top of the plant to lower parts will worsen. Another way to increase the applied light, while maintaining the light distribution, is by focusing the emitted light from the flash either using a reflector or a different light source.
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Id | Requirement name | Description | Category | Allowable Limits | Status | Justification |
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A.1 | Automation | Shall minimize day to day adjustments during data acquisition and postprocessing. | Automation | |||
A.2 | Color checker | Shall tag the color checker image | Automation | |||
D.1 | Plant size | Shall reliably support plant sizes with a planar radius of 30 cm at soil level, centered at each pot. | Data | |||
D.2 | Could support multiple sensors simultaneously | Data | ||||
D.3 | Images shall overlap | Data | 65% | |||
D.4 | File type | Shall output RAW and JPG files | Data | |||
D.5 | File architecture | Shall create a folder per data collection day and save files in such folder | Data | |||
D.6 | Plant size | Shall support plant sizes with a height ranging from 0 cm to 40 cm above the pot soil | Data | |||
D.7 | Plant width | Shall support plant widths up to 24 inch diameters (nice to have up to 30 inches) | Data | |||
G.1 | Internet connection | Good to have | ||||
IQ.1 | Flash (Roller shutter) Intensity | Image Quality | Minimum 200,000 lux | |||
IQ.2 | Flash (Roller shutter) Duration | Image Quality | Minimum of 1/200 sec | |||
IQ.3 | Flash (Global shutter) Intensity | Image Quality | Minimum 1.2M lux | |||
IQ.4 | Flash (Global shutter) Duration | Image Quality | Minimum 1/5000 sec | |||
IQ.5 | Auto focus | Camera shall have auto focus | Image Quality | TRUE/FALSE | ||
IQ.6 | Automatic manual focus | If auto focus FALSE then this one is needed | Image Quality | z positional accuracy of 3 cm | ||
IQ.7 | ISO | The camera shall be configured to avoid analog amplification of pixel values to avoid ISO noise. | Image Quality | ISO=BASE (100 for Sony full frame sensors) Analog amplification of 0dB on pixel readings on non-consumer cameras | Image noise must be kept to a minimum by using the camera’s base ISO while still have an acceptable exposure histogram | |
IQ.8 | Relative Image Resolution | The camera should provide a minimum soil-level Ground Sample Distance (GSD) | Image Quality | 7-9 pixels per mm (emergence) | ||
IQ.9 | Depth of field | Image Quality | Minimum 15 cm | |||
IQ.10 | Color temperature | The color temperature shall be consistent | Image Quality | +/- 200K | ||
IQ.11 | Color rendering index | Image Quality | 90 or greater | |||
M.1 | Species ID | Shall provide species ID for each pot in X, Y position | Metadata | |||
M.2 | Weather info | Shall have accurate local weather data information for each run | Metadata | Captured from on site weather station | ||
M.3 | Light information | Shall provide incident light information per image | Metadata | Sensor positioned near camera | ||
M.4 | Camera position | Shall provide absolute and relative camera position and orientation | Metadata | +/- 1 cm +/- 1o | ||
M.5 | Image metadata | Shall provide ISO and Shutter Speed | Metadata | |||
Shall allow the user to change camera settings | Not a general requirement | |||||
ST.1 | Image throughput | Shall be able to capture images of 500 pots in less than 4 hours (500 images) | Speed and Throughput | |||
ST.2 | Data transfer speed | Shall be such that does not jeopardize the minimum required image throughput. | Speed and Throughput | |||
UI.1 | Visual feedback | Should provide visual feedback to the user for manual inspection of errors during data collection | User Interaction | |||
UI.2 | Shall allow the user to enter metadata | User Interaction | ||||
UI.3 | Shall allow the user to share data | User Interaction | ||||
UI.4 | Shall allow the user to trigger camera independently | User Interaction | ||||
Shall have a method for ensuring |
Emergent design properties
Camera position | RTK | Shall have individual images tagged with RTK position information (x,y,z) |
Camera position | IMU | Shall have IMU data for camera position at each capture event |
Weather information | Weather station | |
Incident light information | Light sensor | Shall have incident light sensor positioned near camera |
Out of Scope
Goal: Industrial camera, auto focus, global shutter