A sensor and monitoring system for performing work upon an inner diameter of a machined workpiece, such as a pipe turned by a lathe, with the work being viewed andor recorded remotely. A single liquid cell comprises several integrated cell walls, the cell walls projecting away from the supporting substrate and having a closed base area and an open cell surface at the cell wall edges. The profile state of the packet is marked prior to the transmission of the packet. The reader may have a decode mode in which light from an aiming light source is received by an image sensor. The camera parameters include position, orientation, ranges of camera view or angle, front and back of a camera volume and projection information on whether an object is projected on a camera orthographically or perspectively, and, when at least one of modeling and rendering of a 3D object is performed, values of the camera parameters are changed in real time. However, the techniques may be used to detect the shape of significant changes within any signal that represents a variable that is changing over time, space or other dimension.