Abstract: A method for estimating a displacement sequence of an object. The method includes mounting an optical marker on the object, exciting a plurality of optical sources of the optical marker, capturing a plurality of images, and extracting the displacement sequence from a first image of the plurality of images and a second image of the plurality of images. The plurality of optical sources are excited utilizing one or more processors. The plurality of optical sources are excited based on an excitation pattern. The plurality of images are captured utilizing an imaging device. The displacement sequence is extracted utilizing the one or more processors. The displacement sequence is associated with the excitation pattern.

Abstract: A system for detecting a target material in a sample. The system includes a sensor, a light source, an image-capturing device, two linear-crossed polarizers including a first polarizer and a second polarizer, and a processing unit. The sensor is configured to place the sample thereon and includes a fabric impregnated with liquid crystals (LCs). The light source is configured to transmit a beam of light through a path passing from the first polarizer, the sensor, and the second polarizer. The image-capturing device is configured to capture an image of a surface of the second polarizer. The image contains a pattern formed by orientations of LCs corresponding to the sample. The processing unit is configured to detect a presence of the target material in the sample by analyzing the captured image.

Abstract: A system for detecting a target material in a sample. The system includes a sensor, a light source, an image-capturing device, two linear-crossed polarizers including a first polarizer and a second polarizer, and a processing unit. The sensor is configured to place the sample thereon and includes a fabric impregnated with liquid crystals (LCs). The light source is configured to transmit a beam of light through a path passing from the first polarizer, the sensor, and the second polarizer. The image-capturing device is configured to capture an image of a surface of the second polarizer. The image contains a pattern formed by orientations of LCs corresponding to the sample. The processing unit is configured to detect a presence of the target material in the sample by analyzing the captured image.

Abstract: A method for estimating a displacement sequence of an object. The method includes mounting an optical marker on the object, exciting a plurality of optical sources of the optical marker, capturing a plurality of images, and extracting the displacement sequence from a first image of the plurality of images and a second image of the plurality of images. The plurality of optical sources are excited utilizing one or more processors. The plurality of optical sources are excited based on an excitation pattern. The plurality of images are captured utilizing an imaging device. The displacement sequence is extracted utilizing the one or more processors. The displacement sequence is associated with the excitation pattern.