Abstract: A dimension measurement apparatus is disclosed, including a carrier plate and a line scan camera. The carrier plate is configured to carry a to-be-measured item. The line scan camera is disposed opposite to the carrier plate along a first direction and configured to photograph the to-be-measured item. The line scan camera is configured to be movable relative to the carrier plate along a second direction, and the first direction is perpendicular to the second direction. The dimension measurement apparatus can improve the shooting efficiency.

Abstract: A system includes an imaging device that captures multichannel image data from a region of interest on a patient, one or more processors, and memory storing instructions. The memory storing instructions cause the one or more processors to receive the multichannel image data from the imaging device, such that the multichannel image data includes an image signal representative of plethysmographic waveform data for the region of interest and specular noise in the multichannel image data. Furthermore, the memory storing instructions cause the one or more processors to generate a projection matrix associated with the multichannel image data and iterate values of the projection matrix to remove the specular noise to generate a representative physiological signal, such that the representative physiological signal has an improved signal-to-noise ratio relative to the image signal and the representative physiological signal is a representative plethysmographic waveform.