The invention provides a wearable guide apparatus for totally blind people. The wearable guide apparatus comprises a head-mounted glasses support, a sensor, an image collector, an audio module, an information output device and a data processing center; the head-mounted glasses support is used for mounting and connecting parts of the apparatus and convenient for a user to wear; the sensor is used for detecting the environment around; the image collector is used for recording an image of the surrounding; the audio module is used for audio interaction; the information output device is used for reminding a wearer of related information; the data processing center is used for total control of the apparatus. The apparatus is capable of acquiring a real scene all-dimensionally in real time, the sensor is used to detect the environment around all-dimensionally, analyzed data is wirelessly transmitted to a remote monitoring unit, and blind guidance and remote monitoring are achieved.

Wearable guide apparatus for totally blind people

The invention provides an infrared focal plane array dynamic blind element processing method and device. The infrared focal plane array dynamic blind element processing method comprises the following steps of (1) perform two-point calibration on an infrared image according to a two-point calibration coefficient of an infrared instrument within a working range and obtaining an output image after calibration; (2) gradually judging whether a difference value between a value of every image element in the output image and a mean value of peripheral neighborhood data which is corresponding to the image element is larger than a preset threshold value or not and obtaining a threshold value judgment result comprising all blind elements and corresponding positions, wherein the image elements with the difference values which are larger than the preset threshold value is the blind elements; (3) generating into a blind element position chart according to the threshold value judgment result; (4) performing real-time calibration on the blind elements in the output image through a self-adaption filter method according to the blind element position chart. The infrared focal plane array dynamic blind element processing method can achieve real-time rapid blind element processing, detect the visible blind elements by adjusting the preset threshold value for blind element judgment and improve the imaging quality of an infrared image.

Infrared focal plane array dynamic blind element processing method and device

The invention relates to an infrared focal plane array blind pixel detection method and device so as to solve the problem of poor stability of a conventional blind pixel detection method. The method, when judging blind pixels, utilizes the feature that the grey level value of an infrared image based on an uniform background is similar to normal distribution to carry out windowing and calculation with each pixel being a center. The accuracy rate of the scheme is poor; and through research, the poor accuracy rate is found to be caused by noise interference. Therefore, on the basis of the above, a frame of detector original image is collected each time, and statistics judgment is carried out on calculation results in a time domain range, and wrong blind pixel detection caused by noise is effectively prevented through setting evidence threshold value, thereby improving detection accuracy.

Infrared focal plane array blind pixel detection method and device

The invention relates to the field of the optical lens, and discloses a pick-up optical lens. The pick-up optical lens comprises a first lens with positive refraction power, a second lens with negative refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power and a fifth lens from an object side to an image side; the curvature radius of the first lens image side is R2, the curvature radius of the first lens object side is R1, the focal length of the third lens is f3, the entire focal length of the pick-up optical lens is f, the on-axis range tothe object side of the third lens from the image side of the second lens is d4, the on-axis thickness of the second lens is d3, the refractive index of the fourth lens is n4, and the following relation formulas are satisfied: R1/R1 is not less than -20.00 and not more than -2.00, f3/f is not less than 0.50 and not less than 3.50, d4/d3 is not less than 1.50 and not more than 5.00, and n4 is not less than 1.69 and not more than 2.10. The pick-up optical lens provided by the invention can satisfy the design requirements of large aperture and long focal length when the good optical performance is provided.

Pick-up optical lens

A system for remotely detecting gas concentration is provided. The system includes a plurality of light sources. At least a first one of the light sources generates light having a first wavelength and a first polarization, and at least a second one of the light sources generates light having a second, different wavelength and a second polarization that is orthogonal to the first polarization. The light from the light sources is placed on a common transmission path, and is directed to a target area by a steering mirror. Light reflected from the target area is received and directed to a detector. The detector provides information regarding the time of arrival and amplitude of the received light, allowing range and gas concentration information to be obtained. In some embodiments the detector is an imaging detector, allowing three-dimensional range information to be obtained from the target area from a single light pulse.

Differential absorption lidar

The invention provides an area array infrared camera quick scaling and heterogeneity calibrating method based on the variant integral time, which includes the following steps: electrifying an infrared area array camera imaging system, and then shielding an optical path by an anti-dazzling screen driven by a micro motor; generating 3 kinds of integral time T1, T2 and T3 by a timing sequence drive module, simultaneously collecting response data X1 (i,j), X2 (i,j) and X3 (i,j) of F (F is not smaller than 50) frames through an image acquisition module at different kinds of integral time, and calculating out the respective mean values: X1(i,j), X2(i,j) and X3(i,j), wherein n=1-50, and (i,j) is the pixel coordinate. The area array infrared camera quick scaling and heterogeneity calibrating method based on the variant integral time is simple in implementation process, does not depend on a black body and a temperature control device thereof, needs less integral time points, and the integration with an infrared imaging process hardware system is easy.

Area array infrared camera quick scaling and heterogeneity calibrating method based on variant integral time

The invention belongs to the technical field of image processing in the infrared focal plane array imaging technology, particularly relates to an infrared focal plane array dynamic blind pixel detection method based on scene matching. The method includes the following steps: firstly comparing a relative error of a pixel response value of a sliding window with a preset threshold value, detecting potential blind pixels existing in the window, and finally matching the processing results of scene images of two frames, excluding false blind pixels and confirming real blind pixels. The method solves the problem that at present, the frequently used scaling-type and scene-type infrared focal plane array dynamic blind pixel detection method has limitation and is poor in accuracy.

Infrared focal plane array dynamic blind pixel detection method based on scene matching

The invention provides a method for acquiring 4D scene information. According to the method, a binocular stereo vision three-dimensional imaging system and an infrared imaging system are combined, through methods of image registration and image fusion, three-dimensional stereo coordinate information and temperature information of a certain position in the real world can be simultaneously acquired, and four-dimensional expression of the real world is realized in a computer. The method mainly comprises steps that: visible light images and infrared images of a left view and a right view of a shooting scene are received and are then pre-processed respectively; characteristic point extraction is then carried out, characteristic point matching is further carried out, and all registration points on the visible light images and the infrared images are established; on the basis of distance and focal length information between two visible light imaging systems, and a depth map of the shooting scene of the two visible light images can be calculated to acquire three dimensional coordinate information of the scene; according to the determined registration points, an interpolation algorithm is employed to realize superposition of the temperature information and the three-dimensional coordinate information, multi-resolution information fusion is realized, and 4D information of the shooting scene can be finally acquired.

Method for acquiring 4D scene information

The invention provides a high-precision temperature-drift resistance temperature measurement method for a thermal infrared imager based on a variable integral mode. The method comprises the following steps: 1, two groups of cyclic alternating driving schedules are realized so as to enable periodic alternation working of the thermal infrared imager to be in two types of integral modes; 2, cycling acquisition of the responsive images output through the thermal infrared imager in the two types of integral modes is realized, a mean value of two types of responsive images is counted, and differential responsive images are calculated; 3, the differential responsive images are demarcated so as to acquire a gain calibration factor and an offset correction factor both required by non-uniform correction, and the two-point correction algorithm is utilized to perform non-uniform correction to the differential responsive images; 4, the differential responsive images subjected to non-uniform correction are demarcated so as to determine the relation curve, corresponding to temperature, of the image mean value. The high-precision temperature-drift resistance temperature measurement method for the thermal infrared imager based on the variable integral mode can be easily integrated in an embedded signal processing platform of the thermal infrared imager, and has the advantages that the implementation is simple and the operation is convenient.

High-precision temperature-drift resistance temperature measurement method for thermal infrared imager based on variable integral mode

This paper designs a compact apochromatic lens with long focal length, which operates over very-broad spectrum from 400nm to 900nm for high resolution image application. The focal length is 290mm, and F-number is 4.5.In order to match CCD sensor, lens resolution must be higher than 100lp/mm. It is a significant challenge to correct secondary spectrum over very-broad spectrum for this application. The paper firstly pays much attention on dispersion characteristic of optical materials over this very-broad spectrum, and dispersion characteristic of glasses is analyzed. After properly glasses combinations and optimal lens structure selected, this compact apochromatic lens is designed. The lens described in this paper comprises fewer lenses, most of them are ordinary optical materials, and only one special flint type TF3 with anomalous dispersion properties is used for secondary spectrum correction. Finally, the paper shows MTF and aberration curve for performance evaluation. It can be seen that MTF of the designed lens nearly reach diffraction limit at Nyquist frequency 100lp/mm, and residual secondary spectrum is greatly reduced to less than 0.03mm (in the lines 550nm and 787.5nm). The overall length of this compact apochromatic lens is just 0.76 times its focal length, and because of fewer lenses and ordinary optical materials widely used, production cost is also greatly reduced.

Zhang Jian

Papers

Area array infrared camera quick scaling and heterogeneity calibrating method based on variant integral time

Infrared focal plane array dynamic blind pixel detection method based on scene matching

Method for acquiring 4D scene information

High-precision temperature-drift resistance temperature measurement method for thermal infrared imager based on variable integral mode

Design of compact apochromatic lens with very-broad spectrum and high resolution