The document compares and contrasts four perceptual computing sensors: Kinect 1, Kinect 2, Leap Motion, and Intel's perceptual computing camera. It provides specifications for each sensor, such as depth resolution, RGB resolution, frame rate, latency, field of view, and hardware capabilities. It also demonstrates each sensor and discusses their advantages and best uses, concluding that Kinect 2 is best for full body interaction with multiple users, Leap Motion provides accurate hand recognition, and Intel's camera is best for desktop applications requiring close-range tracking and recognition features.