Abstract: An optical flow sensing method includes: using an image sensor to capture images; using a directional-invariant filter device upon at least one first block of the first image to process values of pixels of the at least one first block of the first image, to generate a first filtered block image; using the first directional-invariant filter device upon at least one first block of the second image to process values of pixels of the at least one first block of the second image, to generate a second filtered block image; comparing the filtered block images to calculate a correlation result; and estimating a motion vector according to a plurality of correlation results.

Abstract: Disclosed are a visible light communication system and a visible light communication method. In this system, a signal transmitter sends a visible light signal, and a signal light receiver capture an image of the visible light signal to recover the visible light signal according to the captured image. The signal receiver includes an image capturing module, an image processing module and a signal recovery module. The method includes: capturing an image of a visible light signal; processing the captured image of the visible light signal; determining whether there is a complete packet according to the processed image; if yes, directly recovering the visible light signal according to the processed image; but if no, executing a packet recovery process according to the processed image of the visible light signal, then obtaining the complete packet and recovering the visible light signal transmitted from the signal transmitter.

Abstract: A stress measurement method is provided of the present disclosure. The stress measurement method includes an image capturing procedure, a phase shift calculation procedure, an isochromatic intensifying procedure and a transformation procedure. The image capturing procedure is used to capture four light intensity images with four different phase angles of a sample. The phase shift calculation procedure is used to obtain an isochromatic retardation of the sample when the four light intensity images have sufficient light intensity values. The isochromatic intensifying procedure is used to calculate two enhanced light intensity values, the background of intensified isochromatic light intensity value and the amplitude of intensified isochromatic light intensity value to obtain an isochromatic retardation when the sample is in a low stress condition. The transformation procedure is used to transform the isochromatic retardation to a stress value of the sample.

Abstract: A method for analyzing stress in an object according to spectrum data is provided. The spectrum data is obtained from an interference fringe pattern of the object that results from performing photoelasticity. The method includes: analyzing the spectrum data to obtain three sets of intensity data related respectively to different wavelengths of light used in photoelasticity; calculating wrapped phases according to the three sets of intensity data, respectively; calculating preliminary stress values according to the wrapped phases, respectively; determining a system of stress equations according to a relation among the preliminary stress values; and calculating an estimated stress value using the system of stress equations.

Abstract: The present invention is directed to a system and method for on-line real-time measuring the surface topography and out-of-plane deformation by using phase-shifting shadow moiré method. Digital Phase-Shifting Shadow Moiré Method is applied to a system, which receives the reflected images from the surface of transparent or non-transparent plate projected under a light beam passing through a grating. Next, by image correction program, the skewed interference fringe pattern is recovered to the image as if the image acquisition equipment is placed normal to the surface. Furthermore, the received images are processed with Phase-Shifting to show the surface topography of the plate.

Abstract: A stress measurement method is provided of the present disclosure. The stress measurement method includes an image capturing procedure, a phase shift calculation procedure, an isochromatic intensifying procedure and a transformation procedure. The image capturing procedure is used to capture four light intensity images with four different phase angles of a sample. The phase shift calculation procedure is used to obtain an isochromatic retardation of the sample when the four light intensity images have sufficient light intensity values. The isochromatic intensifying procedure is used to calculate two enhanced light intensity values, the background of intensified isochromatic light intensity value and the amplitude of intensified isochromatic light intensity value to obtain an isochromatic retardation when the sample is in a low stress condition. The transformation procedure is used to transform the isochromatic retardation to a stress value of the sample.

Abstract: Disclosed are a visible light communication system and a visible light communication method. In this system, a signal transmitter sends a visible light signal, and a signal light receiver capture an image of the visible light signal to recover the visible light signal according to the captured image. The signal receiver includes an image capturing module, an image processing module and a signal recovery module. The method includes: capturing an image of a visible light signal; processing the captured image of the visible light signal; determining whether there is a complete packet according to the processed image; if yes, directly recovering the visible light signal according to the processed image; but if no, executing a packet recovery process according to the processed image of the visible light signal, then obtaining the complete packet and recovering the visible light signal transmitted from the signal transmitter.

Abstract: An optical interferometric system for measurement of a full-field thickness of a plate-like object in real time includes two light sources, two screens, two image capturing devices, and an image processing module. The light sources radiate incident lights toward a reference point on the plate-like object in respective directions to produce respective interference fringe patterns (IFPs). The image capturing devices capture light intensity distribution images respectively of the IFPS imaged respectively on the screens. The image processing module calculates a fringe order at the reference point according to the light intensity distribution images, and obtains a full-field thickness distribution of the plate-like object according to the fringe order.

Abstract: The present invention discloses a method of determining a whole-scene image by using multiple image-capturing devices, and the method has two main features including non-contact formation digital image method and the parallax elimination process for captured images. The former feature uses a concyclic fitting calculation to easily determine the locations and orientations of the image-capturing devices, so as to achieve the objective of assisting in capturing the whole-scene image. The latter feature can effectively improve the image quality, so as to effectively solve the problems in conventional technology.

Abstract: A method for analyzing stress in an object according to spectrum data is provided. The spectrum data is obtained from an interference fringe pattern of the object that results from performing photoelasticity. The method includes: analyzing the spectrum data to obtain three sets of intensity data related respectively to different wavelengths of light used in photoelasticity; calculating wrapped phases according to the three sets of intensity data, respectively; calculating preliminary stress values according to the wrapped phases, respectively; determining a system of stress equations according to a relation among the preliminary stress values; and calculating an estimated stress value using the system of stress equations.

Abstract: An optical interferometric system for measurement of a full-field thickness of a plate-like object in real time includes two light sources, two screens, two image capturing devices, and an image processing module. The light sources radiate incident lights toward a reference point on the plate-like object in respective directions to produce respective interference fringe patterns (IFPs). The image capturing devices capture light intensity distribution images respectively of the IFPS imaged respectively on the screens. The image processing module calculates a fringe order at the reference point according to the light intensity distribution images, and obtains a full-field thickness distribution of the plate-like object according to the fringe order.

Abstract: A pressure measuring method, applied to a pressure measuring apparatus, comprising: measuring a first pressure sensing value of the pressure measuring apparatus, which corresponds to a first pressure in a test mode; measuring a second pressure sensing value of the pressure measuring apparatus, which corresponds to a second pressure in the test mode; generating a first corresponding function according to the first pressure, the second pressure, the first pressure sensing value and the second pressure sensing value; sensing a third pressure sensing value via the pressure measuring apparatus in a normal mode; and generating a third pressure according to the third pressure sensing value via the first corresponding function; wherein the pressure measuring apparatus operates at a first scan frequency. By this way, the pressure sensing value can be calibrated, to solve the issue that the pressure sensing values are affected by scan frequencies.

Abstract: A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

Abstract: The present invention discloses a method of determining a whole-scene image by using multiple image-capturing devices, and the method has two main features including non-contact formation digital image method and the parallax elimination process for captured images. The former feature uses a concyclic fitting calculation to easily determine the locations and orientations of the image-capturing devices, so as to achieve the objective of assisting in capturing the whole-scene image. The latter feature can effectively improve the image quality, so as to effectively solve the problems in conventional technology.

Abstract: A device for real-time thickness inspection is provided. An optical interferometric technique is used. Measurement requirements in rapid online thickness inspection can be satisfied. An object is measured in a non-contact and non-destructive way. For measuring, an optical spherical wavefront is radiated on the object in an oblique angle. The interference fringe pattern (IFP) thus imaged on a screen is directly related to the thickness distribution of the object. The phase difference on the same horizontal cross section in the IFP monotonically decreases from the light source side to the other side. Accordingly, phase unwrapping can be effectively performed without using phase shift. The present invention achieves rapid on-line thickness inspection through the optical path of interference without using optical lens groups and special optical elements.

Abstract: A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

Abstract: A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

Abstract: A concentric circle adjusting apparatus for a multiple image capturing device is disclosed, where a first and second correction angles for correcting a first and second image capturing devices are respectively calculated by a control device according to a link length of a standard link, a first angle, a second angle, a first distance, and a second distance, respectively, so that a first and second platforms are controlled according to the first and second control commands to rotate the first and second image capturing device by the first and second correction angles, respectively, whereby the efficacy of an increased visible range and a rapid calibration may be achieved.

Abstract: The conventional white-light interferometer, confocal microscope, and ellipsometer are integrated as one device set in a functional sense, and the geometrical parameters conventionally measured may be deduced on the integrated device. Thus, the advantages and efficacies of equipment cost saving, on-line measuring, rapid monitoring, reduced manufacturing time, and reduced possibility of object damage during the manufacturing process may be secured, compared with the prior art.

Abstract: A multi-image capture device capturing images by means of circular motion controls the shift movement, along a semi-circular measuring rod, of a moving mechanism by a location control device. Furthermore, a rotary control device is used to control the positioning and image-capturing angle of a second image capture device fixed on the rotary mechanism. Thereby, a first image capture device and the second image capture device are of a co-circle configuration where the optical axis of the first image capture device and the second image capture device overlap to form a center of the co-circle. Such a configuration can broaden the visual range of the image capture device, and allows quick calibration of the image capture device according to positioning of shift movement and image-capturing angles.