Lettuce seedlings were germinated for 4 weeks and then planted into a sandy loam plot at Eco-Park, with a planting density of 9 plants per square meter. The lettuce grew under natural illumination, facing natural weather conditions in an outdoor environment, reproducing the conditions under which real crops grow. The lettuce was subjected to two conditions: optimal healthiness (8 plants) and suboptimal healthiness (11 plants). The former condition, which will be referred to as “healthy,” was achieved with an irrigation level of 100% (i.e., watering every 2 days), fertilized every 10 days with a peanut-based fertilizer containing nitrogen, protein, phosphorous, potassium, and calcium. The latter condition, which will be referred to as “unhealthy,” was achieved with an irrigation level of 50% (i.e., watering every 4 days) without any fertilizer. The first images were collected 120 days after initial planting.