In this paper, we propose an translation- and scale-invarint adaptive wavelet transform,and according to this adaptive wavelet decomposition, we construct a stable multiresolution feature vector of images which is tra...
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ISBN:
(纸本)0819430064
In this paper, we propose an translation- and scale-invarint adaptive wavelet transform,and according to this adaptive wavelet decomposition, we construct a stable multiresolution feature vector of images which is translation-invariant and scale-invariant. At end, we give some experiment results to demonstrate the stability of this feature vector under translation and scale transform.
Fractal coding of digital images offers many promising qualities. However the coding process suffers from the long search time in the Domain Block Pool. We present a novel idea for speeding up search and improving com...
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ISBN:
(纸本)0819430064
Fractal coding of digital images offers many promising qualities. However the coding process suffers from the long search time in the Domain Block Pool. We present a novel idea for speeding up search and improving compressive ratio, based on the hypothesis that those correlative Range Blocks should have a common code. Experimental result on 512 x 512 Lenna image is 32.8 dB at 0.625 b/pixel and 29.76 dB at 0.214b/pixel.
A simplified system to fuse the infrared and visible light images in real time is introduced in this paper,. A Thermal image System (TIS) and a CCD camera are used to obtain the infrared and visible light images respe...
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ISBN:
(纸本)0819430064
A simplified system to fuse the infrared and visible light images in real time is introduced in this paper,. A Thermal image System (TIS) and a CCD camera are used to obtain the infrared and visible light images respectively. The two different sources images can be correlated completely both in the time and in the space after we salve the problems of synchronizing, dimension matching and visual field matching. Afterward, these images can be used in real time fusion or used the further fusing algorithm.
作者：
Shi, QYPeking Univ
Natl Lab Machine Percept Beijing 100871 Peoples R China
This paper concentrates on two issues related to wavelet-based image coding. At first, an algebra method is proposed to select biorthogonal wavelets for higher compression ratio and better quality of the reconstructed...
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ISBN:
(纸本)0819430064
This paper concentrates on two issues related to wavelet-based image coding. At first, an algebra method is proposed to select biorthogonal wavelets for higher compression ratio and better quality of the reconstructed image. Then, a general algorithm is given to convert a discrete biorthogonal wavelet transform into lifting steps, so that one version of the transform, which maps integers to integers, can support both the lossy and lossless coding to facilitate the region of interest based image compression.
Lighting simulation and image synthesis for outdoor scenes is intractable due to the geometric and lighting complexity of such environment. In this paper we present an efficient framework to the problem of image synth...
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ISBN:
(纸本)0819430064
Lighting simulation and image synthesis for outdoor scenes is intractable due to the geometric and lighting complexity of such environment. In this paper we present an efficient framework to the problem of image synthesis for outdoor scene by combining the geometry-based and image-based rendering. With respect to the linearity of incident spectral power distribution and apparent reflectance, the receptor responses of an image under varying sun position and weather conditions can be calculated to generate the desired image. Our method is proved to be available and feasible for fixed scene and camera geometry.
Approaches to the, prototype information processing system of imaging seeker(PIPSIS) with an Infrared Focal Plane Array (IRFPA) sensor and custom imageprocessing hardware are described. The prototype system consists ...
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ISBN:
(纸本)0819430064
Approaches to the, prototype information processing system of imaging seeker(PIPSIS) with an Infrared Focal Plane Array (IRFPA) sensor and custom imageprocessing hardware are described. The prototype system consists of general digital signal processors(DSP) and specific infrared imageprocessing hardware. An intelligent infrared imageprocessing software with multiple tracking algorithms of projection, label and correlation has been developed in consideration of the specific needs of the seeker system. In an effort to compensate for the photoresponse nonuniformity in the IRFPA sensor, an improved piecewise-linear nonuniformity correction(NUC) procedure is investigated. According to the environmental characteristics of imaging seeker, analog signal pre-processing and image sub-regions segmenting are considered. Experimental results show that PIPSIS could provide maximum track range, more robust tracking, and better false-target discrimination.
In this paper, we present the output probability density functions of generalized open-closing (GOC) and generalized dos-opening (GCO) filters under the different input distributions such as uniform, Gaussian and biex...
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ISBN:
(纸本)0819430064
In this paper, we present the output probability density functions of generalized open-closing (GOC) and generalized dos-opening (GCO) filters under the different input distributions such as uniform, Gaussian and biexponential distributions, and calculate their digital features (expectations and variances). Then, we apply these filters to restore an image corrupted by impulsive noise and further test their efficiency in noise-suppressing and detail-preserving characteristics. The simulation results show that the GOC and GCO filters have good performances.
image segmentation is one of the most difficult problems in multidimensional reconstruction of medical ultrasonic images. A new method for segmentation of medical ultrasonic image based on fractal dimension Lacunarity...
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ISBN:
(纸本)0819430064
image segmentation is one of the most difficult problems in multidimensional reconstruction of medical ultrasonic images. A new method for segmentation of medical ultrasonic image based on fractal dimension Lacunarity is presented in this paper. As fractal features have drawbacks of less number and great redundancy, we developed a method to extend the features combining with micromasks. Experimental results show that our method can enhance he description ability of fractal features and segment the images efficiently.
3D surface reconstruction is one of the hotspots in Computer Vision and Remote Sensing. Relative orientation is a important part of 3D surface reconstraction. The traditional method that finding the paraments of relat...
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ISBN:
(纸本)0819430064
3D surface reconstruction is one of the hotspots in Computer Vision and Remote Sensing. Relative orientation is a important part of 3D surface reconstraction. The traditional method that finding the paraments of relative oriented model is Newton Method, but it is highly sensitive to the initial values of paraments. To overcome this shortage, we give a method of using penalty function to find the relative oriented model in this paper.
Discrete cosine transform (DCT) is widely used in signal processing. This paper presents a novel approach to perform DCT. DCT is expressed in terms of discrete moments and a systolic array for computing DCT with only ...
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ISBN:
(纸本)0819430064
Discrete cosine transform (DCT) is widely used in signal processing. This paper presents a novel approach to perform DCT. DCT is expressed in terms of discrete moments and a systolic array for computing DCT with only a few multiplications and without any cosine evaluations has been proposed. The execution time of the systolic array is only O(Nlog(2)N/log(2)log(2)N) in computing 1-D DCT. The approach is also applicable to multiple dimensional DCT and DCT inverses.
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