ZnO films were prepared by d.c. reactive cathodic sputtering in a planar magnetron. The structural properties of d.c. planar magnetron sputtered ZnO films are studied as a function of deposition parameters: substrate type, substrate temperature, sputter gas pressure, growth rate and sputtering power. ZnO films growth has been carried out in an oxygen and argon atmosphere. In dependence on the O2 partial pressure in the argon sputtering gas there exists a narrow process window around a po/(pAr+po) ratio of 5 - 10% which yields transparent, low- resistance layers. The discharge voltage dependence on the oxygen partial pressure is a sensitive indicator for the oxidation state of the target surface and can be used for the regulation of the deposition process. Lower O2 partial pressures yield metallic-like, opaque, but highly resistant layers. Higher oxygen partial pressures lead to transparent but highly resistant ZnO layers. Layers of lowest resistivity (5 X 10-4 (Omega) cm) and highest optical transmission (90%) have a stoichiometric ratio Zn:O of 1.0 and exhibit the largest grains. These films are applied as piezoelectric transducers in micromechanical sensors and actuators.
{"title":"Optical transmission of ZnO thin films","authors":"I. I. Rusu, I. Bursuc, I. Vascan","doi":"10.1117/12.312693","DOIUrl":"https://doi.org/10.1117/12.312693","url":null,"abstract":"ZnO films were prepared by d.c. reactive cathodic sputtering in a planar magnetron. The structural properties of d.c. planar magnetron sputtered ZnO films are studied as a function of deposition parameters: substrate type, substrate temperature, sputter gas pressure, growth rate and sputtering power. ZnO films growth has been carried out in an oxygen and argon atmosphere. In dependence on the O2 partial pressure in the argon sputtering gas there exists a narrow process window around a po/(pAr+po) ratio of 5 - 10% which yields transparent, low- resistance layers. The discharge voltage dependence on the oxygen partial pressure is a sensitive indicator for the oxidation state of the target surface and can be used for the regulation of the deposition process. Lower O2 partial pressures yield metallic-like, opaque, but highly resistant layers. Higher oxygen partial pressures lead to transparent but highly resistant ZnO layers. Layers of lowest resistivity (5 X 10-4 (Omega) cm) and highest optical transmission (90%) have a stoichiometric ratio Zn:O of 1.0 and exhibit the largest grains. These films are applied as piezoelectric transducers in micromechanical sensors and actuators.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"277 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121295117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Craciun, V. Craciun, C. Martin, I. Mihăilescu, M. Bunescu, E. Vasile, A. Ioncea, I. Boyd
Thin films of hydroxyapatite (HAp) have been grown on Si, quartz, Ti, and Ge substrates by the pulsed laser deposition (PLD) method employing a KrF excimer laser (wavelength (lambda) equals 248 nm, pulsed duration (tau) FWHM equals 20 ns). The influence of the laser deposition parameters on the properties of the grown layers was investigated in order to optimize the Ca/P ratio and the crystalline structure. It was found that the optimum conditions for preserving the Ca/P ratio i.e. high oxygen pressures and low substrate temperatures do not coincide with those for obtaining adherent and crystalline layers i.e. low oxygen pressures and high substrate temperatures. For films deposited onto Ti substrates it was also found that high substrate temperatures promote the diffusion of Ti through the depositing film up to the surface where it gets oxidized. Further investigations are required before high quality HAp-coated Ti implants by PLD can be obtained.
{"title":"Microstructure of hydroxyapatite thin layers grown by pulsed laser deposition","authors":"D. Craciun, V. Craciun, C. Martin, I. Mihăilescu, M. Bunescu, E. Vasile, A. Ioncea, I. Boyd","doi":"10.1117/12.312764","DOIUrl":"https://doi.org/10.1117/12.312764","url":null,"abstract":"Thin films of hydroxyapatite (HAp) have been grown on Si, quartz, Ti, and Ge substrates by the pulsed laser deposition (PLD) method employing a KrF excimer laser (wavelength (lambda) equals 248 nm, pulsed duration (tau) FWHM equals 20 ns). The influence of the laser deposition parameters on the properties of the grown layers was investigated in order to optimize the Ca/P ratio and the crystalline structure. It was found that the optimum conditions for preserving the Ca/P ratio i.e. high oxygen pressures and low substrate temperatures do not coincide with those for obtaining adherent and crystalline layers i.e. low oxygen pressures and high substrate temperatures. For films deposited onto Ti substrates it was also found that high substrate temperatures promote the diffusion of Ti through the depositing film up to the surface where it gets oxidized. Further investigations are required before high quality HAp-coated Ti implants by PLD can be obtained.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129211675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Smeu, N. Puscas, I. Popescu, Grigore I. Suruceanu, R. Ispasoiu
Power stabilized DL's represent today convenient sources for radiometric applications, as transfer laboratory standards. Stability measurements were carried out and reported by other authors for different time intervals, but only for low optical power levels (max. 16 mW). For calibrating usual optical radiometers, such low emitted power DL's are useless. This paper reports stability measurements carried out on several collimated DL's with (lambda) around 980 nm and emitted power up to 265 mW in near-field/150 mW in far-field. Stabilities of the order 1e-4 for short-time intervals (tens of seconds) and 1e-3 for medium-time intervals (1 hour) were found for a non-thermostated structure, having the control photodiode (PD) in the same enclosure with the DL (at the rear of the structure). The corresponding stabilities for an external control PD resulted of the order 1e-5 for both short and medium time intervals. The schematic of the optical power stabilizer is presented.
{"title":"Medium-power stabilized laser diode","authors":"E. Smeu, N. Puscas, I. Popescu, Grigore I. Suruceanu, R. Ispasoiu","doi":"10.1117/12.312820","DOIUrl":"https://doi.org/10.1117/12.312820","url":null,"abstract":"Power stabilized DL's represent today convenient sources for radiometric applications, as transfer laboratory standards. Stability measurements were carried out and reported by other authors for different time intervals, but only for low optical power levels (max. 16 mW). For calibrating usual optical radiometers, such low emitted power DL's are useless. This paper reports stability measurements carried out on several collimated DL's with (lambda) around 980 nm and emitted power up to 265 mW in near-field/150 mW in far-field. Stabilities of the order 1e-4 for short-time intervals (tens of seconds) and 1e-3 for medium-time intervals (1 hour) were found for a non-thermostated structure, having the control photodiode (PD) in the same enclosure with the DL (at the rear of the structure). The corresponding stabilities for an external control PD resulted of the order 1e-5 for both short and medium time intervals. The schematic of the optical power stabilizer is presented.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129281492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Mocofanescu, V. Babin, S. Micloş, Ana-Florica Farcas
We report Q-switching of a Nd:YAG laser with a phase-conjugating mirror based on external stimulated Brillouin scattering in carbon disulfide using a linear resonator. Q-switching is provided by a nonlinear LiF:F2- crystal before the stimulated Brillouin scattering takes place. Employing proper mode selectors pulses with 6 mJ minimum energy and duration of 20 ns were generated, the beam divergence being 1.5 the diffraction limit. A new theoretical model of the Q-switching regime has been proposed and good agreement between experimental and theoretical data has been obtained.
{"title":"Nd:YAG linear resonator using an external stimulated Brillouin scattering Q-switching mirror","authors":"A. Mocofanescu, V. Babin, S. Micloş, Ana-Florica Farcas","doi":"10.1117/12.312798","DOIUrl":"https://doi.org/10.1117/12.312798","url":null,"abstract":"We report Q-switching of a Nd:YAG laser with a phase-conjugating mirror based on external stimulated Brillouin scattering in carbon disulfide using a linear resonator. Q-switching is provided by a nonlinear LiF:F2- crystal before the stimulated Brillouin scattering takes place. Employing proper mode selectors pulses with 6 mJ minimum energy and duration of 20 ns were generated, the beam divergence being 1.5 the diffraction limit. A new theoretical model of the Q-switching regime has been proposed and good agreement between experimental and theoretical data has been obtained.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116822086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Infrared absorption spectroscopy can be performed at very high resolution by tunable diode laser (TDL) based optical systems for any gas with well resolved absorption spectra. In a double beam setup atmospheric trace gas concentration can be measured down to ppb levels. The analysis of trace gases may have useful applications in detecting chemicals in the human breath for non invasive medical diagnostic. The capability of TDL based breath analysis was well demonstrated by monitoring ammonia and methane. In the human body the formation of free radicals does induce oxidative degradation of polyunsaturated fatty acids (lipid peroxidation) which is a damage for cells and organs in the organism. Specific volatile hydrocarbons generated as end product by lipid peroxidation (LP) can be found inside circulating blood and expired breath. TDL based analysis of those specific hydrocarbons (ethane and pentane) in the expired breath can allow a non invasive assessment of the LP extent.
{"title":"Laser-based assessment of lipid peroxidation in humans","authors":"G. Giubileo","doi":"10.1117/12.312823","DOIUrl":"https://doi.org/10.1117/12.312823","url":null,"abstract":"Infrared absorption spectroscopy can be performed at very high resolution by tunable diode laser (TDL) based optical systems for any gas with well resolved absorption spectra. In a double beam setup atmospheric trace gas concentration can be measured down to ppb levels. The analysis of trace gases may have useful applications in detecting chemicals in the human breath for non invasive medical diagnostic. The capability of TDL based breath analysis was well demonstrated by monitoring ammonia and methane. In the human body the formation of free radicals does induce oxidative degradation of polyunsaturated fatty acids (lipid peroxidation) which is a damage for cells and organs in the organism. Specific volatile hydrocarbons generated as end product by lipid peroxidation (LP) can be found inside circulating blood and expired breath. TDL based analysis of those specific hydrocarbons (ethane and pentane) in the expired breath can allow a non invasive assessment of the LP extent.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116887750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trichloroethylene with added molecular oxygen was photolyzed with a TEA CO2 laser radiation, at v4 (933 cm-1) fundamental vibrational band for C2HCl3 and at v3 (1020 cm-1) fundamental vibrational band for C2DCl3. The stable final products in the infrared multiphoton dissociation of trichloroethylene were determined by mass spectrometry in the 0.5 - 10 Torr pressure range of the gas. After the photodissociation process, the following final products appeared: HCl (or DCl), C2Cl2, C2Cl4, C2Cl4O, CO, Co2 and C2O3. Experimental measurements were also performed to obtain information about the dependence of the specific dissociation rate versus laser pulse energy, for both isotopic species of trichloroethylene.
{"title":"Infrared photochemistry of trichloroethylene in the presence of oxygen","authors":"C. Ungureanu, M. Ungureanu","doi":"10.1117/12.312814","DOIUrl":"https://doi.org/10.1117/12.312814","url":null,"abstract":"Trichloroethylene with added molecular oxygen was photolyzed with a TEA CO2 laser radiation, at v4 (933 cm-1) fundamental vibrational band for C2HCl3 and at v3 (1020 cm-1) fundamental vibrational band for C2DCl3. The stable final products in the infrared multiphoton dissociation of trichloroethylene were determined by mass spectrometry in the 0.5 - 10 Torr pressure range of the gas. After the photodissociation process, the following final products appeared: HCl (or DCl), C2Cl2, C2Cl4, C2Cl4O, CO, Co2 and C2O3. Experimental measurements were also performed to obtain information about the dependence of the specific dissociation rate versus laser pulse energy, for both isotopic species of trichloroethylene.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117293752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The output beam characteristics of a CW diode end-pumped miniature Nd:YVO4 laser (1.1 at.%, 1 X 3 X 3 mm3) operating in fundamental and SHG regime are presented. Using M2 factor to describe the multimode pump beam's propagation from the broad-emission-area diode-laser the coupling optics was designed to obtain a high value for the mode-matching efficiency. A maximum slope efficiency of (eta) s equals 58.6%, with (eta) 0 equals 53.8% optically efficiency at maximum pump power, characterized a laser resonator of 50 mm length in transversal TEM00 mode. In the SHG experiments using a KTP crystal a maximum power of 100 mW was reach in a circular laser beam of 4.2 mrad half-angle divergence.
研究了连续波二极管端泵浦微型Nd:YVO4激光器(1.1 at)的输出光束特性。%， 1 X 3 X 3 mm3)在基本和SHG状态下工作。利用M2因子描述宽发射区二极管激光器的多模泵浦光束的传输，设计了耦合光学器件，以获得较高的模式匹配效率。在横向TEM00模式下，50 mm长激光谐振腔的最大斜率效率为(eta) s = 58.6%，最大泵浦功率下的最大斜率效率为(eta) 0 = 53.8%。在使用KTP晶体的SHG实验中，在4.2 mrad半角发散的圆形激光束中达到了100 mW的最大功率。
{"title":"Output beam characteristics of a Nd:YVO4 miniature laser","authors":"N. Pavel, T. Taira, M. Furuhata, Takao Kobayashi","doi":"10.1117/12.312776","DOIUrl":"https://doi.org/10.1117/12.312776","url":null,"abstract":"The output beam characteristics of a CW diode end-pumped miniature Nd:YVO4 laser (1.1 at.%, 1 X 3 X 3 mm3) operating in fundamental and SHG regime are presented. Using M2 factor to describe the multimode pump beam's propagation from the broad-emission-area diode-laser the coupling optics was designed to obtain a high value for the mode-matching efficiency. A maximum slope efficiency of (eta) s equals 58.6%, with (eta) 0 equals 53.8% optically efficiency at maximum pump power, characterized a laser resonator of 50 mm length in transversal TEM00 mode. In the SHG experiments using a KTP crystal a maximum power of 100 mW was reach in a circular laser beam of 4.2 mrad half-angle divergence.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115784870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of circular harmonics to design correlation filters represents one of the most powerful approach in one-target recognition with in-plane rotation invariance. Recognition of more than one target can be achieved, on the other hand, using synthetic discriminant functions. In this paper we describe how can be combined these two techniques to design a filter which ensures rotation invariant recognition of multiple targets in parallel. The usefulness of the filter is demonstrated, for the case of two targets, by experimental results obtained from computer simulations.
{"title":"Rotation-invariant pattern recognition using circular harmonics and synthetic discriminant functions","authors":"D. Cojoc","doi":"10.1117/12.312785","DOIUrl":"https://doi.org/10.1117/12.312785","url":null,"abstract":"The use of circular harmonics to design correlation filters represents one of the most powerful approach in one-target recognition with in-plane rotation invariance. Recognition of more than one target can be achieved, on the other hand, using synthetic discriminant functions. In this paper we describe how can be combined these two techniques to design a filter which ensures rotation invariant recognition of multiple targets in parallel. The usefulness of the filter is demonstrated, for the case of two targets, by experimental results obtained from computer simulations.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116264691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It is now well known that the microstructure of materials in thin film form can be slightly different from that of corresponding bulk materials. Conventional evaporation using a heated crucible or an electron beam gun generally leads to a lacunar structure in columns. Some consequences of this microstructure on the optical properties of the films are well-known. The refractive indices are slightly smaller than that of the bulk material; water adsorption-desorption in the voids leads to variations of the spectral reflection and transmission of the coatings. But apart from these disadvantages, the columnar structure can present advantages because it also induces anisotropy of refractive index. When deposited with an ion beam assistance the microstructure of the material is modify and so is its anisotropy. The anisotropy can then be controlled through the ion energy, making it possible to construct multilayer filters combining both isotropic films and anisotropic films. This opens the way for the making of components acting on the polarization state of light. Results of calculation for different components are presented. Planar non absorbing monochromatic polarizers or polarization rotators can be made in this way. The difficulty in controlling the deposition comes from the fact that the anisotropic layers must be deposited on non rotating substrates. This problem is discussed and examples of measured optical properties of multilayer filters will be given.
{"title":"Polarizing interference coatings made with anisotropic thin films","authors":"F. Flory, C. Defay","doi":"10.1117/12.312722","DOIUrl":"https://doi.org/10.1117/12.312722","url":null,"abstract":"It is now well known that the microstructure of materials in thin film form can be slightly different from that of corresponding bulk materials. Conventional evaporation using a heated crucible or an electron beam gun generally leads to a lacunar structure in columns. Some consequences of this microstructure on the optical properties of the films are well-known. The refractive indices are slightly smaller than that of the bulk material; water adsorption-desorption in the voids leads to variations of the spectral reflection and transmission of the coatings. But apart from these disadvantages, the columnar structure can present advantages because it also induces anisotropy of refractive index. When deposited with an ion beam assistance the microstructure of the material is modify and so is its anisotropy. The anisotropy can then be controlled through the ion energy, making it possible to construct multilayer filters combining both isotropic films and anisotropic films. This opens the way for the making of components acting on the polarization state of light. Results of calculation for different components are presented. Planar non absorbing monochromatic polarizers or polarization rotators can be made in this way. The difficulty in controlling the deposition comes from the fact that the anisotropic layers must be deposited on non rotating substrates. This problem is discussed and examples of measured optical properties of multilayer filters will be given.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114777353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Mendlovic, A. Shemer, Z. Zalevsky, E. Marom, G. Shabtay
Morphological correlation is a novel method for obtaining high discrimination ability in pattern recognition applications. It provides also important abilities for image compression and image analysis. The concept is based on slicing the input image and the reference filter into many binary slices, e.g. 255, and correlating them. The morphological correlation is defined as the summation of these correlations. The morphological correlation is characterized by a sharp correlation peak narrower than that exhibited by matched filter. The disadvantages are the requirements of performing many correlations and its very high sensitivity to noise added to the reference image. In this presentation we suggest two methods to solve both drawbacks. First, instead of 255 correlations we suggest to utilize only 8, by representing the grey level of each pixel by its 8 bit binary representation. Then, 8 binary masks are constructed according to the binary representation. In order to address the problem of severe sensitivity to noise, we suggest to sum the 255 correlations of the morphology slices while each slice is multiplied by a weighting factor which equals the correlation peak of that specific slice with noise divided by its correlation peak value when no noise is added. The solutions suggested here were examined by computer simulations demonstrating considerable improvements in the performance of the morphological correlator.
{"title":"Novel approaches in morphological correlations","authors":"D. Mendlovic, A. Shemer, Z. Zalevsky, E. Marom, G. Shabtay","doi":"10.1117/12.312784","DOIUrl":"https://doi.org/10.1117/12.312784","url":null,"abstract":"Morphological correlation is a novel method for obtaining high discrimination ability in pattern recognition applications. It provides also important abilities for image compression and image analysis. The concept is based on slicing the input image and the reference filter into many binary slices, e.g. 255, and correlating them. The morphological correlation is defined as the summation of these correlations. The morphological correlation is characterized by a sharp correlation peak narrower than that exhibited by matched filter. The disadvantages are the requirements of performing many correlations and its very high sensitivity to noise added to the reference image. In this presentation we suggest two methods to solve both drawbacks. First, instead of 255 correlations we suggest to utilize only 8, by representing the grey level of each pixel by its 8 bit binary representation. Then, 8 binary masks are constructed according to the binary representation. In order to address the problem of severe sensitivity to noise, we suggest to sum the 255 correlations of the morphology slices while each slice is multiplied by a weighting factor which equals the correlation peak of that specific slice with noise divided by its correlation peak value when no noise is added. The solutions suggested here were examined by computer simulations demonstrating considerable improvements in the performance of the morphological correlator.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127465361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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