On-the-go Caliper andCounter Device for Shade andFruit Tree Nursery Inventory Management J.S. Owen Jr., W. Shi, S. Singh, H.M. Stoven, K. Lewis
Seasonal Counts for Inventory Images by Jim Robbins
Automation of InventoryProcesses for Nurseries Dr. James Robbins – Extension Specialist Image by Jim Robbins
Caliper as an Estimate of Grade Tallymaster – 2003
On-the-Fly Tree CaliperMeasurement 2 Class 3 lasers, 60 Hertz camera
On-the-Fly Tree CaliperMeasurement Capture multiple frames per tree at varying angles
Caliper 2 Class 3 lasers Caliper estimation at 60 times per second (60 Hz) Filtered from light Algorithm incorporated to process staked trees Caliper measured at: distance of 10 to 20” from tree 6” (±2”) above the graft union or soil travelling 3 mph
Field Caliper GUI User can specify if stakes are used and diameter of stake Reports optimum measuring distance range and maximum allowed traveling speed to ensure adequate estimates per tree (approx. 12)
Staked Tree Accuracy Limitation for staked trees Need to know the caliper of the stake Caliper of stake and tree must be significantly different (ratio of stake caliper to tree caliper) Left figure shows stakes deemed acceptable, right figure shows stakes that are not viable.
Counter Software Graphic User Interface to include user input, pausing and saving data
On-the-Fly Tree Counter J frank Schmidt, OR - 45 Sergeant crabapples travelling < 3 mph. Trees were counted 5 times with an average accuracy of 97% Willow Drive Nursery, WA - 20 apple small caliper seedlings travelling approx 2 mph. Trees were counted 10 times with an average accuracy of 95%. At Dave Wilson Nursery, CA - 50 cherries trees travelling approx 2.5 mph. Each of the tree cultivars were counted 10 to 20 times with an average accuracy of 97% At J frank Schmidt, OR - 45 Gymnocladus seedlings travelling approx 2.5 mph. Each of the tree cultivars were counted 4 times with an average accuracy of 97% At J frank Schmidt, OR on 708 Staked 2 year old red pointe maple (½ - 1 ¼ caliper, 12 inch spacing) 91 to 90% accuracy. Low accuracy was result of a dust film on lens.
Localization Post-processed Device: U-blox 6T Cost: $300 to $400 Sub-meter accuracy Field tested ○ Spring (WA) ○ Fall (OR)
Localization Tractor track: raw data in red Processed data in green.
Localization Tractor’s speed plot: during travel at ~3.0 mph