Sizes and fruit weight
With a scale, each fruit gets a diameter in millimetres, a caliber class, and a mass. Without one, sizes stay in pixels.
Diameter and caliber
The diameter is the equivalent diameter of the fruit mask's area, times millimetres per pixel. Each fruit gets two classes:
| Standard | Classes |
|---|---|
| NY/T 940-2006 | small under 50 mm · medium 50 to 70 mm · large over 70 mm |
| EU diameter codes | MM over 47 up to 56 · M over 56 up to 66 · G over 66 up to 81 · GG over 81 up to 102 · GGG over 102 mm |
Measured mass
Mass is estimated as a sphere of that diameter at 1.0 g/cm³. A 60 mm fruit comes to 113 g. Tomato flesh is close to water, 0.95 to 1.05 g/cm³. An oblate fruit seen from the side weighs about 5 to 10% more than this, and a fruit half hidden by a leaf reads smaller.
When a fruit is left out of the average
The walk's mean mass leaves out:
- fruit cut by the frame edge, since their mask is partial;
- fruit wider than 110 mm, or 2.5 times the walk's median diameter, whichever is lower. The median rule needs at least 5 fruit.
These boxes usually cover several fruit, or a fruit much nearer the camera than the board. They keep their own mass and are marked mass_outlier. On an example greenhouse photo with a board, four such boxes of 113 to 133 mm lifted the mean of 131 fruit from 84 g to 112 g. The rule keeps the real spread from depth: on that photo the near third has a median of 57 mm and the far third 32 mm.
How the forecast uses it
A crop cycle turns fruit counts into kilograms in this order:
- Harvest kilograms per red and turning fruit, from earlier weeks that have both a walk and a harvest. This also carries how much of the row the walk sees.
- Otherwise, the walk's measured mean mass per red and turning fruit, when it had a scale.
- Otherwise, the grams you typed for each ripeness class on the cycle.
The forecast note and the week view say which one was used (kg_basis).