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检索条件"任意字段=Conference on Optical and Digital Image Processing"

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A new method for 3D object reconstruction in real-time

A new method for 3D object reconstruction in real-time

引用

International conference on Computational Cybernetics (ICCC)

作者： Dan Ionescu Bodgan Ionescu Shahidul Islam Cristian Gadea Mgestyk Technologies University of Ottawa Ottawa ONT Canada

ISBN: (纸本)9781424474325;9781424474332

A novel real-time depth-mapping principle and camera where pulsed laser light is combined with a gain-modulated camera and a phase-locked loop control of laser intensity is described in this paper. The depth resolution is variable depending on the resolution of the camera and of the gating possibilities of the sensor. A sensor of 1 Mpixel is used providing a resolution of 1024 × 1024 which can be gated with very high speeds up to a few ns. Front images of real objects are reconstructed in 3D views based on the data provided by the laser imaging technique and on a new image processing algorithm, in real-time. The new method based on pulsed laser diodes is applicable to various types of image sensors as required by the application domain. As such the camera can be used for gaming, for controlling through gestures various computer applications spanning from digital signage to for example unmanned vehicles. Results are provided for a low end camera used in gaming. A new human computer interface based on gesture control is described. A series of experiments in which the camera is used to capture human gestures which are interpreted and recognized by various image processing algorithms are given.

关键词： Cameras image reconstruction optical pulses image processing Humans Phase locked loops optical control Lighting control High-resolution imaging Diode lasers

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Fast 3D object recognition using multiple color coded illumination

Fast 3D object recognition using multiple color coded illumi...

引用

International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： E. Schubert Zentrum Für Sensorysysteme Center for Sensor Systems Universität-Gesamthochschule Siegen Siegen Germany

The acquisition and measurement of two- and three-dimensional contours of objects are important tasks in modern production processes and quality control. Specially, nontactile methods like optical triangulation and the digital image processing are becoming more and more important. Color image processing in combination with color coded illumination could be used to realize new methods of nontactile 3D-object ranging. Two of these methods are the color-coded triangulation and the color-coded phase-shift method. We use a combination of these two methods to realize a fast 3D-object ranging with unambiguous results. The color-coded phase-shift method is able to reach a good spatial resolution, but the measured range values are ambiguous. Using color-coded triangulation an unambiguous three-dimensional image could be achieved, but compared to the color-coded phase-shift method, the spatial resolution is poor. Since both methods are able to generate a 3D-object description by processing only a single RGB-image, it is possible to combine these two methods.

关键词： Object recognition Lighting Color Spatial resolution image resolution Phase measurement Cameras Sensor systems Modems Production systems

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image reconstruction from phase hologram obtained by using single phase information

Image reconstruction from phase hologram obtained by using s...

引用

IEEE Signal processing and Communications Applications (SIU)

作者： Gülhan Ustabaş Kaya Zehra Saraç Duygu Önal Tayyar Fizik Bölümü Elektrik ve Elektronik Mühendisliği Bölümü Bülent Ecevit Üniversitesi Zonguldak Türkiye Fizik Bölümü GYTE Kocaeli Türkiye Gebze Teknik Universitesi Gebze TR

In this study, it is aimed to obtain the real time image of the object, whose off-axis hologram recording is saved on CCD camera, from digital phase hologram. For creating the phase hologram, the phase information of the hologram recording on CCD camera is obtained. When the phase information is obtained, the Fourier transform algorithm and continuous wavelet transform methods are used. Finally, the using methods in this study are compared in terms of obtaining real time image having a high image quality and minimum power loss.

关键词： Holography Charge coupled devices Optics image reconstruction optical interferometry Signal processing conferences

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Dense motion fields for digital video processing and compression

Dense motion fields for digital video processing and compres...

引用

IEEE International conference on image processing

作者： S. Lin O.G. Guleryuz Department of Electrical Engineering Polytechnic University Brooklyn NY USA

This paper presents novel algorithms that perform motion estimation for video processing and compression. We observe that "smoothness" is a very important and intuitive property in the estimation of motion fields. It is pointed out that most current motion estimation techniques implement smoothness as a constraint, differing only in terms of the specific type of smoothness demanded from video data. This paper views smoothness as a property that is determined by the underlying video data rather than a predetermined and specific property that is imposed on video data. Instead of forcing the available video data to conform to an abstract smoothness model, we try to select the "smoothest" motion field that conforms to the available data. We propose fast and efficient techniques that determine a set of possible motion fields and that select the smoothest field from this set. Issues like quantization and embedded video compression (via embedded motion fields) are discussed.

关键词： Video compression Motion estimation Video sequences Motion analysis optical computing image motion analysis Engineering management Terminology Bandwidth Layout

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Accurate spatio-temporal restoration of compact single frame defects in aged motion pictures

Accurate spatio-temporal restoration of compact single frame...

引用

International conference on image Analysis and processing

作者： A. Machi F. Collura CNR Istituto di Calcolo e Reti ad Alte Prestazioni Palermo Italy

Spikes of brightness often locally affect single frames of aged motion pictures, because of dust, dirt and scratches injuring the film surface. We present a method for accurate digital detection and restoration of such kinds of film defects. The method evaluates both global and local intraframe disparity statistics after motion-compensation and uses them to detect abnormal spikes. It recovers image structure from the same frame by linear interpolation of defect surroundings and refines details from the temporal neighbourhood. Weights of the blending filter are set according to local reliability of the motion estimation maps. A texture pattern is also extracted from spatial support areas, and added to regions with limited recovery from the temporal neighbourhood. Experiments performed on synthetic sequences show very high recall and precision rates, and low recovery errors. High quality restoration of severely damaged sequences is shown.

关键词： Aging Motion pictures image restoration Layout Brightness Nonlinear filters optical noise image motion analysis image edge detection Maximum likelihood detection

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Measurement of Single Mode Fiber Non-circularity Based on image processing

Measurement of Single Mode Fiber Non-circularity Based on Im...

引用

2008 International conference on optical Instruments and Technology

作者： XIAO Shaorong~*,HU Hen,MAO Xiaoli,ZHANG Bo School of Electronic and Information Engineering,Nanjing University of Information Science & Technology,Nanjing 210044

Method of computer digital image processing was utilized to measure non-circularity of single mode *** two end faces were polished,the faces come into plane,and which are perpendicular to fiber *** beam was thrown on one end of the fiber,and an inerratic spot was formed from light beam put out at another end of the *** spot was shot by a digital camera with 5.1×10～6 *** image was processed with a *** process includes full color picture being translated into gray one,contrast enhancement,median filtering,and picking-up contour *** every different three points on the contour line were taken out to determine one circular radius,average of many radiuses was calculated,The maximum radius and the minimum radius are picked out to calculate the fiber no-circularity in according to *** C++ and Matlab were used to *** results of experiment show that measurement precision is independent of the sampling number,but dependence of gray value,and average standard deviation is about 0.03%.

关键词： single mode fiber contour line non-circularity digital image processing

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New high speed image acquisition system and image processing techniques for fertiliser granule trajectory determination

New high speed image acquisition system and image processing...

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7th European conference on Precision Agriculture, ECPA 2009

作者： Hijazi, B. Cointault, F. Dubois, J. Villette, S. Vangeyte, J. Yang, F. Paindavoine, M. ENESAD UP GAP 26 Bd Dr Petitjean 21079 Dijon Cedex France Le2i Laboratory UMR CNRS 5158 University of Burgundy BP 47870 21078 Dijon Cedex France ILVO T and V Agrotechniek Burg. Van Gansberghelaan 115 9820 Merelbeke Belgium

ISBN: (纸本)9789086861132

Since the beginning of the 90's, the problem of the environment became crucial, particularly in term of soil fertiliser use. In Europe, approximately 85% of fertiliser are distributed using centrifugal spreader, due to their relative low cost, simplicity and robustness. Numerous research have been done on the understanding of the spreading process from the vane to the soil, using optical or imaging systems. In order to predict the fertiliser deposition on the soil using a ballistic flight model, several parameters need to be determined, notably the velocity of the granules (about 35 m/s) when they leave the spinning disc. This paper presents improvements of previous high speed imaging systems developed at Enesad and ILVO Institute. New stroboscopic approach is first proposed using power-Leds located 1m height around the digital camera, which avoid the problem of illumination changing due to flashes which could not have exactly the same characteristics. This apparatus is piloted with a FPGA card specifically dedicated to our application. Multiexposure images acquired are then treated with Gabor filters method, alternative to previous method based on Markov Random Fields (MRFs). Results obtained on simple and synthetic images are very good but the first tests on real images of ejected granules give no significant information due to the particular motion of the fertiliser, bound to centrifugal force and small displacement. The use of specific intercorrelation method allows us to obtain quite similar results to the use of MRFs technique, with the need of a motion initialisation. We are currently comparing the two previous methods in different ejection cases. We have however proved that the special motion of the fertiliser granules could not be determined with classical motion estimation methods.

关键词： Gabor filters

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Thresholding and character recognition from a digital raster image

Thresholding and character recognition from a digital raster...

引用

IEEE International conference on System of Systems Engineering (SoSE)

作者： T.L. Ganapathi R.M. Lourde Department of Electrical and Electronics Engineering Birla Institute of Technology and Science Pilani India

The basic aim of this paper is recognition of a character from a thresholded picture file, and converting it to text for further applications. The program first accepts a picture of raster type as input and removes the background noise from the picture. An iterative method of thresholding is presented which performs this operation. The picture is then passed through a number of pre-processing steps before recognition of characters. Character recognition using perceptual distance functions was first tried out. Because of the computational complexity involved in this method, a new method of character recognition using 2-dimensional discrete correlation is proposed in this paper. A comparison between the two methods is presented

关键词： Character recognition optical character recognition software Background noise image segmentation Computational complexity optical computing Pixel Pattern recognition image recognition image converters

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Road Green Belt Extraction Algorithm Based on Morphology and Color Index

Road Green Belt Extraction Algorithm Based on Morphology and...

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Computer Science and Blockchain (CCSB), International conference on

作者： Yi Zhang RongGui Ma XueYing Wang Chang’ an University/ School of Information Engineering Xi'an China Inner Mongolia Autonomous Region Traffic Construction Engineering Quality Monitoring and Appraisal Station Inner Mongolia China

Taking the highway images captured by UAV aerial photography as the research object, a highway greening information extraction algorithm based on digital image processing morphology and visible light color index is proposed. Firstly, the experimental image is enhanced by HSV image. An improved vegetation color index - red-green-blue difference index (RGBDI) is established by comprehensively using the three optical bands of visible light red, green and blue. Then, the maximum entropy threshold segmentation method is used to binarize the image. The recognition results are modified by using the digital image processing morphology to reconstruct the open operation and the closed operation, and the final experimental results are obtained. The results are compared with the common 6 color indexes: green leaf index (GLI), normalized green-red difference index (NGRDI), normalized green-blue difference index (NGBDI), relative greenness index (GCC), over-green index (ExG) and over-green minus red index (ExG - ExR) extraction effects. The results show that the green belt extraction algorithm combining morphology and ultra-green leaf index (EGLI) can extract the green space information of the study area well. The kappa coefficient reaches 88.0%, which is the best effect.

关键词： Photography image color analysis Roads digital images Green products Morphology Vegetation mapping

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A DSP based real-time position calculation circuit for beta camera

A DSP based real-time position calculation circuit for beta ...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： S. Yamamoto T. Matsuda I. Kanno Kobe City College of Technology Kobe Japan Research Institute for Brain and Blood Vessels AKITA Akita Japan

A digital signal processor (DSP) based position calculation circuit was developed and tested for beta camera. The previous position calculation circuit employed flash analog to digital (A-D) converters for A-D conversion and ratio calculation occurred significant line artifacts in the image due to the differential non-linearity of the A-D converters. The new position calculation circuit uses four A-D converters for only A-D conversion of the analog signals from the position sensitive photomultiplier tube (PSPMT). The DSP reads the A-D signals and calculates the ratio of Xa/(Xa+Xb) and Ya/(Ya+Yb) in event by event basis. The DSP also magnifies the image to fit the useful field of view (FOV) and rejects the events out of the FOV. The line artifacts in the image was almost eliminated.

关键词： digital signal processing Cameras image converters Timing Circuit testing Analog-digital conversion optical imaging Floods Positron emission tomography Voltage

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