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890 results about "Image processing software" patented technology

Resolving power measuring device and resolving power evaluation method for three-generation dim light image intensifier

The invention discloses a resolving power measuring device and a resolving power evaluation method for a three-generation dim light image intensifier, and belongs to the field of optical measurement and metering. The resolving power measuring device is characterized by consisting of a light source component, a resolving power target, a collimator tube, an imaging objective lens, a test camera obscura, a charge coupled device (CCD) camera and a computer. The resolving power evaluation method comprises the following steps of: imaging the resolving power target irradiated by a standard light source to a fluorescent screen by using a measured image intensifier; converting into a frame image of a target line by using the CCD camera, and transmitting into the computer; successively processing asingle frame image of the target line by using a normalized cross correlation model and an optical modulation degree model through internal image processing software of the computer to acquire a single frame processing result; and analyzing multi-frame processing results and performing corresponding supplement operation to acquire a final resolving power evaluation result. By the device and the method, the problem of objective evaluation during resolving power measurement of the three-generation dim light image intensifier is solved; and the device and the method can be popularized to other measurement fields such as an intensified charge coupled device (ICCD) measurement field and the like where resolving power is required to be objectively evaluated, and have wide application prospects.
Owner:CHINA NORTH IND NO 205 RES INST

Automatic registration of images

ActiveUS20060276698A1Reliable measurementOptical density ratios are more reliably and easily obtainedDiagnostic recording/measuringSensorsVisual perceptionImage contrast
The present invention relates to a system for automatically evaluating oxygen saturation of the optic nerve and retina, said system comprising: image capturing system further comprising: a fundus camera (26), a four wavelengths beam splitter (27), a digital image capturing device (28), a computer system, image processing software performing in real-time the steps of: registering set of multi-spectral images (1) by, binarizing the multi-spectral image (7), find the all the border regions of each image by finding the region including the straight line that passes the most number of points in the region (8), use the orientation of the borders to evaluate the orientation of each spectral image (9), equalize the orientation of each spectral image by rotating the spectral image (10), edge detect each spectral image (11), estimate the translation between the spectral images based on the edges of adjacent images (12), transform the images to a stack of registered images (13), locating blood vessels (2) in each of the multi-spectral images by, retrieving registered spectral images (14), for each spectral image, remove defective pixels (15), enhance image contrast (16), perform top-hat transform using structuring element larger than the largest vessel diameter (17), binarize each image (18), apply filter for smoothing the image (19), combine all the spectral images using binary AND operator (20), skeletonize the resulting image (21), prune the skeleton image (22), re-grow the pruned image (23), locate junction points (24), evaluating the width of the blood vessels (3) by calculating the normal vector to the vessel direction to, estimate the direction and position of the vessel profile, evaluate positions of vessel walls based on the vessel profile obtained, evaluate vessel width based on the position of the vessel walls, selecting samples for calculating optical density, calculating the optical density ratio (4), evaluating oxygen saturation level (5), and presenting the results (6), wherein presenting the results may include presenting numerical and visual representation of the oxygen saturation.
Owner:OXYMAP EHF

Conveyor belt longitudinal-tearing online monitoring early warning device

The invention relates to a conveyor belt longitudinal-tearing online monitoring early warning device, which belongs to the online monitoring technical field of conveyor belts in coal mine enterprises. A charge coupled device (CCD) infrared camera is installed below the conveyor belt to collect a picture of the conveyor belt, the picture is collected by a picture collection card to a host computerwith picture processing software, characteristics of processed pictures are compared through the software, the picture of cracks and tearing on the surface of the conveyor belt is recognized, the length of the crack is calculated, the host computer is communicated with a programmable logic controller (PLC) to issue an alarm or to carry out stop operation according to a set threshold value of the length of the crack, and a distance from a malfunction point to a monitoring point is detected and calculated through a speed sensor. In order to resist the interference, a sealing cabin is used for sealing a device detection area, and a cold light source is used for the light filling. Due to the adoption of the early warning device, the possible tearing accident of the conveyor belt can be accurately detected in time. The conveyor belt longitudinal-tearing online monitoring early warning device has the advantages that: cost is low, reliability is high, practicability is strong, effective sound-light alarm can be executed to reduce the tear of the conveyor belt when the tearing degree is smaller, and emergency stop also can be realized when a sudden larger degree tear of the conveyor belt is detected.
Owner:TAIYUAN UNIV OF TECH +1

Virtuality-reality head-mounted display equipment distortion parameter measuring method

The invention discloses a virtuality-reality head-mounted display equipment distortion parameter measuring method. According to the method, a screen is made to output a formwork drawing having a coordinate system, and a virtual image is captured by employing a camera instead of eyes; an image shot by the camera is processed through image processing software so as to correct self distortion of the camera, and a corresponding coordinate is extracted; through sampling a coordinate position of an original formwork drawing and a distorted coordinate position after lens imaging, a distortion parameter of certain single-color light is figured out; the screen is made to sequentially output coordinate formwork drawings of R, G and B three colors, the previous steps are repeated, and each distortion parameter of R, G and B is acquired. Through the method, on the basis of an actual imaging state of VR head-mounted display equipment, the virtual image is captured by employing the camera instead of the eyes, repeated debugging of the parameter can be avoided, moreover, developers are not required to have basic knowledge of optical design, so reliability or operation difficulty is better than a method determining the distortion parameter through theoretical simulation.
Owner:NANJING RUIYUE INFORMATION TECH

Visual gas hydrate experimental device

The invention discloses a visual gas hydrate experimental device. The visual gas hydrate experimental device comprises a reactor, a constant-current gas supply system, a constant-current liquid supply system, a temperature control system, a constant-pressure gas exhaust system, a sampling analysis system and a data acquisition and processing system, wherein the reactor is divided into a plurality of sections; each section is provided with a window; a water jacket is arranged on an external wall without the window; a feeding hole is formed at the bottom; the constant-current gas supply system and the constant-current liquid supply system supply gas and a solution to the reactor respectively at a constant speed; the temperature control system controls the gas and the solution which are to be supplied to the reactor and controls a temperature of each water jacket; the constant-pressure gas exhaust system is used for exhausting the gas from the reactor and controlling a pressure in the reactor to be constant; the sampling analysis system takes samples from the interior of the reactor and carries out component analysis; and the data acquisition and processing system acquires the data of the constant-current gas supply system, the constant-current liquid supply system, the reactor and the temperature control system and carries out analysis. By adoption of the scheme, fast and efficient generation of a gas hydrate can be realized, on-line real-time observation of the crystal structure and the appearance of the hydrate in the process of hydrate composition / decomposition can be also realized, and the crystal structure and the appearance of the hydrate are analyzed by image processing software.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

Non-invasive rapid detection device of aquatic animal morphological feature

InactiveCN101288589ARapid determinationDetermination is accurate and harmlessPerson identificationSensorsAquatic animalMeasurement point
An aquatic animal morphological character damage-free rapid measuring method belongs to the technical field of aquatic animal measuring methods, which is characterized in that the method comprises the following steps: a standard graduated scale is laid beside the aquatic animal to be measured and a clear image is shot with a digital camera; the image is led into a computer image processing software to determine the ratio X between the unit length of the standard graduated scale and the correspondent image distance; correspondent frame measuring fixed points are selected on the image profile and the image distance L1 between the points measured is measured according to the measuring requirements of aquatic animal morphological characters of different types when the image size is kept unchangeable; the actual distance L0 between the points measured is calculated according to the computing formula that L0 is equal to X*L1. The measuring method realizes the rapid, accurate and damage-free measurement of the shapes of living aquatic animals, which has important meaning for improving the work efficiency of object aquatic animal morphological research and provides possibility for the measurement and tracing observation of the aquatic animal living body.
Owner:ZHEJIANG INST OF FRESH WATER FISHERIES

Large-caliber off-axis non-spherical measuring and calibration system

The invention relates to a large-caliber off-axis non-spherical measuring and calibration system, which comprises an interference instrument, a standard lens, two plane concave lenses, a right-angle reflection prism, a standard plane reflection mirror and an off-axis non-sphere to be measured or calibrated. Standard parallel light which is transmitted from the interference instrument is focused on a focus point of the off-axis non-sphere to be measured or calibrated through the standard lenses, then the standard parallel light becomes parallel light after being reflected by the off-axis non-sphere and is reflected back along the original light path through the standard plane reflection mirror, finally the surface shape of the large-caliber off-axis non-sphere is analyzed and processed by image processing software of the interference instrument so as to complete the measurement of the large-caliber off-axis non-sphere. Narrow beam which is also transmitted from the center of the interference instrument enters the first plane concave lens along the direction of the main light axis, the narrow beam enters the right-angle reflection prism after being transmitted, the narrow beam deflects 90 degrees after being reflected by the right-angle reflection prism to enter the second plane concave lens, the narrow beam is finally emitted through the lowest point and the highest point of the off-axis non-sphere surface vector, and the standard plane reflection mirror is moved, so the beam is returned along the original path, the center of each element can be ensured to stay on the same height, and the geometric parameter measurement and calibration of the large-diameter off-axis non-sphere can be completed according to the known conditions.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI

Characterization method of pore structure of porous concrete based on CT (Computerized Tomography) technology

The invention discloses a characterization method of a pore structure of porous concrete based on a CT (Computerized Tomography) technology. Pore structure parameters such as the plane porosity, the effective aperture and the aperture distribution of the porous concrete are obtained by analyzing a CT-scanned two-dimensional cross-sectional image through an image processing method. The characterization method specifically comprises the following steps: firstly, acquiring the two-dimensional cross-sectional image of the porous concrete by a CT scanner, and acquiring a clear pore distribution map by white and black binarization of the image by a computer; then, calculating the area representing a pore region by image processing software and converting the region into a circle with equal area; and finally, carrying out statistic analysis on data with pore grater than 1mm to obtain the pore structure parameters such as the plane porosity, the effective aperture and the aperture distribution of the porous concrete. By adopting the characterization method of the pore structure of the porous concrete, not only is the test method simple, but also the precision is high and the error is small.
Owner:UNIV OF JINAN
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