Why do robots need hysteresis in obstacle detection thresholds?

Example Concept: Hysteresis in obstacle detection involves setting two distinct thresholds: one for detecting an obstacle (higher threshold) and another for clearing it (lower threshold). This ensures that once an obstacle is detected, the system will not switch back to a "no obstacle" state until the sensor reading falls below the lower threshold. This approach prevents oscillations and provides a buffer against sensor noise, leading to smoother and more predictable robot behavior.