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Journal of Infrared and Millimeter Waves
Contents
2002
Volume: 21 Issue 3
18 Article(s)
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Research Article
Segmentation based on mumford-shah model combined with narrow band
[in Chinese], [in Chinese], and [in Chinese]
A segmentation model that combines the Mumford Shah(M S) model and narrow band scheme of level set was presented. The disadvantage of Mumford Shah model is computationally time consuming. In each step of its iteration, the data of whole image have to be renewed, which is unbearable for segmentation of large image or 3D
A segmentation model that combines the Mumford Shah(M S) model and narrow band scheme of level set was presented. The disadvantage of Mumford Shah model is computationally time consuming. In each step of its iteration, the data of whole image have to be renewed, which is unbearable for segmentation of large image or 3D image. Therefore, a fast segmentation model was introduce, which combines the M S model and narrow band scheme by a new initialization method. The new initialization method is based on fast marching method, and the computing time decreases to O(N) . In each step of iteration, the new segmentation model only deals with the data in a narrow band instead of the whole image. The experiments show that the two models can obtain almost the same segmentation result, but the computing time of new narrow band M S model is much less than that of M S model..
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Journal of Infrared and Millimeter Waves
Publication Date: Jan. 01, 1900
Vol. 21, Issue 3, 161 (2002)
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HIGH QUALITY NANOCRYSTALLINE DIAMOND FILMS GROWN BY RF-HFCVD
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
High quality diamond films were successfully prerared on quartz via the radio frequency plasma enhanced hot filament chemical vapor deposition(RF HFCVD)process. The effects of substrate temperature, reaction gas pressure and RF power on the structural and optical properties of prepared films were studied. The results s
High quality diamond films were successfully prerared on quartz via the radio frequency plasma enhanced hot filament chemical vapor deposition(RF HFCVD)process. The effects of substrate temperature, reaction gas pressure and RF power on the structural and optical properties of prepared films were studied. The results show that their optimal values are 700℃, 2×133Pa and 200W, respectively. Under the optimal deposition parameters, the achieved diamond nucleation density can be as high as 10 11 cm -2 , and after growth for 1 h, nanocrystalline diamond film can always be obtained with its grain size of about 25nm, its average surface roughness of about 55?, and its optical transmission of 90% in the infrared region(800nm)..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 167 (2002)
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Ba
0.65
Sr
0.35
TiO
3
PYROELECTRIC CERAMICS PREPARED BY MICROWAVE SINTERING
[in Chinese], [in Chinese], and [in Chinese]
The Ba0.65Sr0.35TiO3 ceramic materials were prepared by sol gel processing and microwave sintering, and their dielectric properties and pyroelectric properties were studied and compared with the same componential material prepared by conventional processing. The experimental results showed that the synthetic temperatur
The Ba
0.65
Sr
0.35
TiO
3
ceramic materials were prepared by sol gel processing and microwave sintering, and their dielectric properties and pyroelectric properties were studied and compared with the same componential material prepared by conventional processing. The experimental results showed that the synthetic temperature of the BST powder can be reduced from 1100℃ to 900℃, and the BST ceramic with fine grains(~1μm)can be obtained at 1310℃ for 25 min by microwave sintering. In comparison of conventional ceramics, by this method, the relative dielectric constant and pyroelectric coefficient of the BST sample change slightly while the dielectric loss reduces greatly; thereby the pyroelectric figure of merit is increased to two times of the conventional materials..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 171 (2002)
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OPTICAL PROPERTIES OF PbTiO3 THIN FILMS PREPARED BY A MODIFIED SOL-GEL PROCESSING
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Uniform and transparent PbTiO 3 amorphous thin films were deposited on the quart glass substrate using a modified sol gel processing. The optical properties of PbTiO 3 amorphous thin films were investigated in detail. The refractive index was calculated and in good agreement with Cauchy function. The optical band gap o
Uniform and transparent PbTiO 3 amorphous thin films were deposited on the quart glass substrate using a modified sol gel processing. The optical properties of PbTiO 3 amorphous thin films were investigated in detail. The refractive index was calculated and in good agreement with Cauchy function. The optical band gap of the PbTiO 3 amorphous thin films was obtained about 3.84 eV using semiconductor theoretical calculation. The FTIR spectrum investigation of the PbTiO 3 amorphous thin films shows that no absorption appears in the mid infrared region. Six IR active phonon modes were observed in the PbTiO 3 thin films annealed at 550℃ by far infrared reflectance spectra..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 175 (2002)
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NUMERICAL SIMULATION OF VISIBLE AND INFRARED RADIATION PROPERTIES OF HYPERSONIC REENTRY BODIES
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The flow field over hypersonic small blunt bodies at zero incidence were numerically simulated by VSL equations with the nonequilibrium chemical source terms. The boundary condition of the wall temperature was improved. The discrete coordinate method to solve radiation transfer equation under body fitted coordinate sys
The flow field over hypersonic small blunt bodies at zero incidence were numerically simulated by VSL equations with the nonequilibrium chemical source terms. The boundary condition of the wall temperature was improved. The discrete coordinate method to solve radiation transfer equation under body fitted coordinate system was established. And the 7 species air shock layer radiation field of small blunt head body in reentry was simulated by this method combined with band model. The influence of absorption coefficient error on the computational result of head body radiation field was investigated in the ultraviolet region(0.2~0.4μm), visible region(0.4~0.8μm)and infrared region(0.8~2.0μm)..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 180 (2002)
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RADIATIVE TRANSFER INSIDE A LINEARLY GRADED INDEX SEMI-TRANSPARENT SLAB:GRAY SUBSTRATE WALL AND SPECULAR SEMI-TRANSPARENT SURFACE
[in Chinese], [in Chinese], and [in Chinese]
Radiative transfer inside a linearly graded index semi transparent slab was analyzed. One boundary of the medium is a gray diffuse wall and the other is a specular semi transparent interface. Curved ray tracing technique was used to solve the radiative transfer equation and pseudo source adding method was adopted to ob
Radiative transfer inside a linearly graded index semi transparent slab was analyzed. One boundary of the medium is a gray diffuse wall and the other is a specular semi transparent interface. Curved ray tracing technique was used to solve the radiative transfer equation and pseudo source adding method was adopted to obtain the intensity of the gray wall. Based on these, the inner intensities were deduced. The analytical method of this paper can be used to check the correctness of previous work that was based on a multi layered numerical method. The relative errors show that the previous method is effective in solving such problems..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 185 (2002)
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A NOVEL NEURAL NETWORK LEARNING METHOD OF DYNAMICALLY TUNING REGULARIZATION COEFFICIENT ACCORDINT TO FUZZY RULES
[in Chinese], and [in Chinese]
Based on bias variance model, a novel method of dynamically tuning the regularization coefficient by fuzzy rules inference was proposed. The fuzzy inference rules and membership functions were effectively determined. Furthermore, the method was compared with the traditional BP algorithm and fixed regularization coeffic
Based on bias variance model, a novel method of dynamically tuning the regularization coefficient by fuzzy rules inference was proposed. The fuzzy inference rules and membership functions were effectively determined. Furthermore, the method was compared with the traditional BP algorithm and fixed regularization coefficien's method. The result is that the proposed method has the merits of the highest precision, rapid convergence and best generalization capacity. The capacity proposed method is shown to be a very effective method by several examples simulation..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 189 (2002)
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VIDEO OBJECT SEGMENTATION BASED ON GREY-CONSECUTIVE REGIONS SEGMENTATION
[in Chinese], and [in Chinese]
A spatio temporal method which aims at segmenting moving objects from stationary background automatically and accurately was proposed. Three steps are followed steps in the algorithm. First, the current frame is segmented into connected regions of uninterrupted grey scale. Secondly, The intersections of each two neighb
A spatio temporal method which aims at segmenting moving objects from stationary background automatically and accurately was proposed. Three steps are followed steps in the algorithm. First, the current frame is segmented into connected regions of uninterrupted grey scale. Secondly, The intersections of each two neighbor defference images are gotten to judge which pixels are moving pixels. Finally, those moving regions are segmented from the stationary regions according to a certain rule. The experimental results show that the algorithm is effective in the segmenting moving objects from the stationary background accurately..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 195 (2002)
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A NOVEL ALGORITHM OF IMAGE ERROR CONCEALMENT ON DCT DOMAIN WITH LOW COMPLEXITY
[in Chinese], and [in Chinese]
To solve the problem that image and video packets are liable to be lost when transmitted in packet switch network, a novel algorithm of image error concealment on DCT domain with low complexity was proposed. By using scalability coding technology, the coded image data were partitioned into two groups with different pri
To solve the problem that image and video packets are liable to be lost when transmitted in packet switch network, a novel algorithm of image error concealment on DCT domain with low complexity was proposed. By using scalability coding technology, the coded image data were partitioned into two groups with different priorities according to their effects on the image quality in the encoder. When decoding, based on its attributes and the pre determined threshold, the lost image block was concealed. Simulation results show that by using the proposed algorithm, better image quality and quite lower computing complexity can be obtained..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 200 (2002)
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PARAMETER OPTIMIZATION OF RECOGNITION MODEL OF LANDMARK SPECTRUM COMPOSITION BASED ON GENETIC ALGORITHM
[in Chinese], and [in Chinese]
In order to extract the information characterization of landmark spectrum out of TM image, the functional relation of recognition of landmark spectrum compositions was constructed and the general principle of landmark recognition out of TM image was proposed. Genetic algorithm(GA) was applied to optimize the coefficien
In order to extract the information characterization of landmark spectrum out of TM image, the functional relation of recognition of landmark spectrum compositions was constructed and the general principle of landmark recognition out of TM image was proposed. Genetic algorithm(GA) was applied to optimize the coefficients of functional relation of landmark spectrum composition. It is very easy to recognize each landmark from TM image, according to the correspondent relation between each landmark and the ranges of function values. The analysis of cases shows that this recognition model of landmark spectrum composition has the properties of simplicity, practicability and differentiation..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 205 (2002)
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A KIND OF METHOD FOR IR SMALL TARGET RECOGNITION BASED ON MULTI-SENSORS SPATIO-TEMPORAL INFORMATION FUSION
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In order to improve the reliability of small target recognition under strong clutter, a method called IR small target recognition based on multi sensors spatio temporal information fusion was proposed. And the D S theory of evidence combination was used in the simulation calculation of information fusion of image from
In order to improve the reliability of small target recognition under strong clutter, a method called IR small target recognition based on multi sensors spatio temporal information fusion was proposed. And the D S theory of evidence combination was used in the simulation calculation of information fusion of image from multiple IR sensors. The simulation shows that the method has the preferable performance for the recognition of IR small target under strong clutter..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 209 (2002)
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THE SPECTRUM EXPERIMENTS OF ALGAE AND STUDIES ON RETRIEVAL QUANTITATIVE IMFORMATION FROM ITS SPECTRA
[in Chinese], [in Chinese], and [in Chinese]
Through the spectrum experiments with Microcytis wesenbergii, Scenedesmus obliquus and it's mixture cultivated in laboratory, the qualitative characteristics of the algal spectrum were obtained, that provided basic information for classifying algae by the technology of remote sensing. Quantitative spectrum informat
Through the spectrum experiments with Microcytis wesenbergii, Scenedesmus obliquus and it's mixture cultivated in laboratory, the qualitative characteristics of the algal spectrum were obtained, that provided basic information for classifying algae by the technology of remote sensing. Quantitative spectrum information of the two algae was retrieved with spectrum decomposition method, and set up algorithmic model between spectrum information and alga concentration..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 213 (2002)
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DEVELOPMENT OF A MILLISECOND PULSE-HEATING APPARATUS WITH A MULTI-WAVELENGTH PYROMETER AND AN INTEGRATING REFLECTOMETER FOR THERMOPHYSICAL PROPERTIES MEASUREMENT
[in Chinese], [in Chinese], and [in Chinese]
A millisecond pulse heating reflectometric technique with multi wavelength pyrometry to measure the thermophysical properties of a strip specimen was developed. The multi wavelength normal spectral emi ssivity of the strip were measured by a multi wavelength pyrometer and an integrating reflectometer. The measurement t
A millisecond pulse heating reflectometric technique with multi wavelength pyrometry to measure the thermophysical properties of a strip specimen was developed. The multi wavelength normal spectral emi ssivity of the strip were measured by a multi wavelength pyrometer and an integrating reflectometer. The measurement technique and components of the milliecond pulse heating apparatus are described. The heat capacity, electrical resistivity, total hemispherical emissivity and multi wavelength spectral emissivity of the specimen can be measured simultaneously by using this apparatus..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 218 (2002)
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MULTI-WAVELENGTH ATTENUATION PROPERTIES OF FIRE SMOKES
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Laser lights with different wavelengths were used to study the attenuation characteristics of fire smoke through considering the laser interaction with fire smoke and non fire aerosol at the same time.Three pairs of extinction coefficient ratio(ECR) for five kinds of typical fire smoke and non fire aerosol, including i
Laser lights with different wavelengths were used to study the attenuation characteristics of fire smoke through considering the laser interaction with fire smoke and non fire aerosol at the same time.Three pairs of extinction coefficient ratio(ECR) for five kinds of typical fire smoke and non fire aerosol, including incense smoke and diesel flame smoke, etc., were obtained. It was shown that ECR reflects the relative extinction degree of lasers with two different wavelengths, so that ECR is only dependent on the basic characteristics of aerosols, irrespective of the concentration of aerosols. Different smoke aerosols will have evidently different ECR..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 221 (2002)
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UP-CONVERSION LUMINESCENCE DECAY CHARACTERISTICS OF ELECTRON TRAPPING MATERIALS CaS:Eu, Sm
[in Chinese], [in Chinese], and [in Chinese]
According to electron trapping mechanism, the up conversion luminescence decay model of electron trapping materials CaS:Eu, Sm was proposed, and the related rate equations were established. The solution of rate equations is of 3 order exponential decay form. The up conversion luminescence decay curves of the materials
According to electron trapping mechanism, the up conversion luminescence decay model of electron trapping materials CaS:Eu, Sm was proposed, and the related rate equations were established. The solution of rate equations is of 3 order exponential decay form. The up conversion luminescence decay curves of the materials at different temperature were measured and analyzed by nonlinear curve fit method, and the expression of nonlinear curve fit is of the same form as the solution..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 225 (2002)
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TARGET CLASSIFICATION OF THE DATA FUSION IN MULTICHANNEL USING DEMPSTER-SHAFER METHOD
[in Chinese], [in Chinese], and [in Chinese]
The Dempster Shafer (D S) theory of evidential reasoning and its application were described. The data fusion in multichannel was implemented by the theory. An algorithm of data fusion in multichannel was designed for the target classification.
The Dempster Shafer (D S) theory of evidential reasoning and its application were described. The data fusion in multichannel was implemented by the theory. An algorithm of data fusion in multichannel was designed for the target classification..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 229 (2002)
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SEGMENTATION OF EXTENDED TARGET IN COMPLEX ENVIRONMENT
[in Chinese], [in Chinese], and [in Chinese]
A new segmentation algorithm, which utilizes boundary, area and texture features for segmenting extended target in complex environment, was proposed. the target was segmented preliminarily by series boundary technique based on knowledge, Then a new fractal segmentation algorithm was used to suppress the complex nature
A new segmentation algorithm, which utilizes boundary, area and texture features for segmenting extended target in complex environment, was proposed. the target was segmented preliminarily by series boundary technique based on knowledge, Then a new fractal segmentation algorithm was used to suppress the complex nature background blocks in the image. And the mathematical morphology method was utilized for eliminating the background conglutination. The experimental results indicated the validity of the method for segmenting the extended target in complex environment and that the method can reserve the shape details of the target perfectly..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 233 (2002)
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INTERFACE ANALYSIS OF DLC FILM DEPOSITED ON Hg
1-x
Cd
x
Te
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A dense and homogeneous nanograins diamond like carbon(DLC)film was deposited on the well polished HgCdTe wafer by radio frequency plasma chemical vapor deposition at room temperature. The interface of DLC?HgCdTe was studied by AES and compared with that of ZnS?HgCdTe, which was prepared by ion sputtering(IS).The resul
A dense and homogeneous nanograins diamond like carbon(DLC)film was deposited on the well polished HgCdTe wafer by radio frequency plasma chemical vapor deposition at room temperature. The interface of DLC?HgCdTe was studied by AES and compared with that of ZnS?HgCdTe, which was prepared by ion sputtering(IS).The result shows that both DLC film and ZnS film can suppress the dissociation of the weak bonding HgTe, and prevent Hg escaping from MCT surface to some extent. However, both Zn and S in ZnS layer tend to diffuse inward MCT, while diffusion of C from DLC layer into MCT is rather slight. In particular, IR transmission of MCT deposited with DLC is remarkable raised comparing to the naked surface and higher than that of MCT deposited with ZnS..
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Journal of Infrared and Millimeter Waves
Publication Date: Jun. 01, 2002
Vol. 21, Issue 3, 238 (2002)
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