Abstract:In some cases, for instance, when a target is located at a long distance, when a target has low local contrast, when a target is obscured and when the pattern of a target zone occurs frequently, it is difficult for a direct recognition method to correctly recognize the target. For this reason, a recognition method for typical ground buildings based on indirect location of planar landmarks is proposed. At the ground preparation stage, the landmarks are selected and their reference images are prepared. At the flight stage, the landmarks are captured, recognized and located by a matching algorithm automatically. Then, the spatial constrains between the target and the landmarks are used to indirectly locate the local region of interest which contains the target. When the local region of interest has high contrast, the direct recognition based on morphological processing framework at final stage is started. The adaptability of the proposed algorithm is tested and analyzed in the simulation experiment.

Abstract:On the basis of the author''s existing work and thought, the splitting photon model is further analyzed and discussed. The relationship between the total quantity (e.g. absorbance, reflectivity and transmittance) on the sense of assemblage or integrity and the corresponding quantities of single photons (e.g. absorption fraction, reflection fraction and transmission fraction) is given. The splitting photon model can be used to explain the optical phenomena such as reflection, diffraction, interference and so on. On the basis of the Monte Carlo method and the splitting photon model, the optical phenomena such as reflection, diffraction and interference can be simulated by computer. The idea of simulation algorithm is presented.

Abstract:A wireless switch cabinet bus connector temperature monitoring system based on MLX90621 infrared sensor was presented. The hardware and software of the wireless temperature acquisition system were designed by using a STM32 microcontroller, a MLX90621 infrared sensor and a nRF24L01 wireless communication module. The temperature data of high voltage switch cabinet bus connectors were measured by the non-contact MLX90621 infrared sensor array in real time and were uploaded by the nRF24L01 wireless communication module and the UART interface to the host computer for displaying. Because of the advantages of low cost, high stability and anti-interference, the system was suitable for the complex magnetic field environment in switch cabinets.

Abstract:A quantitative non-destructive tissue oxygen detection system based on Near Infrared Spectroscopy (NIRS) was proposed. By using a micro-spectrometer to replace the traditional signal receiving and processing part, the wavelength of the light source was measured in real time. The influence of the environment was compensated by a compensation algorithm. After the calculation of output spectral signals processed by mean and FFT filtering, the tissue oxygen concentration was obtained. In the forearm occlusion experiment, the effectiveness of the measurement results of Regional Saturation of Oxygen (rSO2) was verified. The measurement results were consistent with the theory. This showed that the NIRS technology based on the spectrometer could monitor rSO2 better and its adaptability was better than that of traditional methods.

Abstract:It is difficult to detect and recognize dim and small infrared targets in the complicated sea-sky background. To solve this problem, a remote small target recognition method based on sea-sky line detection is proposed. In the method, the correlation processing is performed on the infrared images collected. To improve the signal-to-clutter ratio of the target, the background clutter noise is suppressed through multi-level wavelet transform. Then, a multi-direction Gabor filtering fusion method is used to enhance the edge of the sea-sky line and the sea-sky line is positioned and detected through Hough transform. Finally, by positioning the sea-sky-line, the target search area near the sea-sky line is determined, the potential area of the target is narrowed and hence the detection and recognition probability of the dim and small target in the background of sea and sky is improved.

Abstract:Research on infrared radiation characteristics is one of the important ways to detect, recognize and track space targets. In this research, temperature is an important parameter. To analyze the infrared radiation characteristics of cylindrical targets in space, the change rule of space target''s surface temperature field with the number of grids is studied on the basis of node network mode and difference method. Finally, the minimum grid number required to obtain the accurate surface temperature field of a space target is derived.

Abstract:According to the basic principle of infrared photon detectors, the basic physical mechanism limitation of photon detector performance was analyzed. The normalized detectivity which depended on the photon noise of background radiation was deduced. The change of the normalized detectivity under background limitation with the cutoff wavelength and background temperature was calculated theoretically. The calculation results were analyzed theoretically and the corresponding conclusion was given. Finally, a method for improving the normal detectivity under background limitation was proposed.

Abstract:To observe the change regularity of infrared temperature of Conception Vessel (CV) in women''s menstrual period, the infrared radiation images of ten young healthy women in their menstrual periods, ovulation periods and luteal phases were obtained by infrared thermography. The analysis results showed that the change of body surface infrared temperature at the Guanyuan acupoint had remarkable synchrony with the curve of basal body temperature in the menstrual period. The surface temperature at the Shenque acupoint decreased to the lowest point in the ovulation period, which had a remarkable difference (P<0.05) compared with that in the menstrural period or luteal period. This periodical change at Shenque acupoint was the objective expression of the traditional Chinese medical theory about the accumulation of qi and blood in female uterus. This suggested that the abdominal conception vessel and its acupoints on abdomen of healthy women showed specific thermal characteristics during the different phase of menstruation,which provided evidence for its application in diagnosis and treatment of gynecological diseases.