Patent ID: 8907287

Claim:
A patient support apparatus comprising a monitoring system including a first detector detecting electromagnetic radiation from a first field of view of the first detector and providing a signal indicative of characteristics of the electromagnetic radiation, a second detector comprising an infrared detector detecting infrared radiation from at least a portion of the first field of view, the second detector providing a signal indicative of characteristics of the infrared radiation, and a controller including a processor coupled to the first detector, the second detector, and a memory device, the memory device including instructions that, when executed by the processor, cause the processor to process the signals from the first and second detectors, translate each of the signals into an array of data, and evaluate the data in the arrays to determine characteristics of a patient positioned in the first field of view, wherein a patient is supported on a support plane that intersects an image plane of at least one of the first and second detectors, wherein the controller corrects the data signal from at least one of the first and second detectors to compensate for variations in the relationship between the support plane and the image plane, and wherein the patient support apparatus further includes an angle sensor that provides a signal to the controller indicative of the relationship between the support plane and the image plane.