This paper presents algorithms for automatically delineating colonies in microbiology engineering. The algorithm procedure consists of image preprocessing, image classification, edge detection, thresholding, colony bo...
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ISBN:
(纸本)0780385667
This paper presents algorithms for automatically delineating colonies in microbiology engineering. The algorithm procedure consists of image preprocessing, image classification, edge detection, thresholding, colony boundary tracing, split based on shape analysis and color detection. A number of imageprocessing and segmentation algorithms are included in a system, after image classification, the system configure a colony delineating algorithm procedure for each of the corresponding classes, that means that five classes have five different colony delineating algorithm procedures. The algorithms can automatically delineate colonies not only on a simple image and also on a complex image. The algorithms have been tested in different laboratories, they work well.
This paper highlights some problems related to the identification of parametric motion models in image sequences by the so-called differential methods. This often entails the bad behavior of the algorithms used, leadi...
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ISBN:
(纸本)0780331222
This paper highlights some problems related to the identification of parametric motion models in image sequences by the so-called differential methods. This often entails the bad behavior of the algorithms used, leading to poor results. Appropriate solutions are proposed. The differential algorithms are particularly effective for complex motion estimation, even of large magnitude.
This paper addresses the issue of oblivious robust watermarking, within the framework of colour still image database protection. We present an original method which complies with all the requirements nowadays imposed ...
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ISBN:
(纸本)0819452017
This paper addresses the issue of oblivious robust watermarking, within the framework of colour still image database protection. We present an original method which complies with all the requirements nowadays imposed to watermarking applications: robustness (e.g. low-pass filtering.. print & scan, StirMark), transparency (both quality and fidelity), low Probability of false alarm, obliviousness and multiple bit recovering. The mark is generated from a 64 bit message (be it a logo. a serial number, etc.) by means of a Spread Spectrum technique and is embedded into DWT (Discrete Wavelet Transform) domain, into certain low frequency coefficients, selected according to the hierarchy of their absolute values. The best results were provided by the (9,7) bi-orthogonal transform. The experiments were carried out on 1200 image sequences, each of them of 32 images. Note that these sequences represented several types of images: natural. synthetic, medical, etc. and each time we obtained the same good results. These results are compared with those we already obtained for the DCT domain, the differences being pointed out and discussed.
In image coding, the choice of a good image coding algorithm is very dependent on the image content. Based on this fact, dynamic coding algorithms have been designed. They try to find an optimal coding scheme for each...
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ISBN:
(纸本)0780332598
In image coding, the choice of a good image coding algorithm is very dependent on the image content. Based on this fact, dynamic coding algorithms have been designed. They try to find an optimal coding scheme for each image segment. They rely on an exhaustive search of the best coding algorithm. Evaluation of all algorithms is computationally very intensive and strongly limits the number of considered algorithms for a given application. Therefore, current standards rely on a single coding algorithm. This paper investigates a way to predict coding quality from the image content. This prediction is based on a neural network. The coding quality is computed from image region features. Those features are easy and fast to compute, and are common to the whole set of considered coding algorithms. Therefore, the choice of the best algorithm can be based on those predicted coding qualities, and does not require the computation of all coding algorithms. The system is also fast enough to be used for a dynamic bitrate allocation, and a simple algorithm to do this is proposed.
Recent works have shown that GenLOT coding is a very effective technique for compressing seismic data. The role of a transform in a coder is to concentrate information and reduce statistical redundancy. When used with...
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ISBN:
(纸本)0780370414
Recent works have shown that GenLOT coding is a very effective technique for compressing seismic data. The role of a transform in a coder is to concentrate information and reduce statistical redundancy. When used with embedded zerotree coding, GenLOTs often provide superior performance to traditional block oriented algorithms or to wavelets. In this work we investigate the use of Generalized Unequal Length Lapped Orthogonal Transforms (GULLOT). Their shorter bases for high-frequency components are suitable for reducing ringing artifacts in images. While GULLOTs yield comparable performance to GenLOTs on smooth seismic signals like stacked sections, they achieve improved performance on less smooth signals such as shot gathers.
With emergence of the smart and intuitive interfaces during the past few years the need for robust and reliable algorithms rises. Many methods have been proposed for image segmentation, and particularly for static ges...
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ISBN:
(纸本)9789531841917
With emergence of the smart and intuitive interfaces during the past few years the need for robust and reliable algorithms rises. Many methods have been proposed for image segmentation, and particularly for static gesture recognition. In this article, using Microsoft Kinect sensor, we attempt to analyze and compare three selected algorithms for image segmentation intended for static gesture recognition, namely Convexity Defects, K-Curvature and Part-based Hand Gesture Recognition.
Methodology and stages of data processing in multichannel airborne radar imaging systems are considered. It is shown that data fusion in such systems requires special techniques, algorithms, and software for image pro...
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ISBN:
(纸本)0819436771
Methodology and stages of data processing in multichannel airborne radar imaging systems are considered. It is shown that data fusion in such systems requires special techniques, algorithms, and software for imageprocessing and information retrieval. Some approaches and methods are proposed. The results are demonstrated for simulated and real images.
One of the most common tasks in imageprocessing is to change the resolution of a picture. In this paper we present a new nonlinear method for interpolating digital images, which is particulary effective in the rendit...
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ISBN:
(纸本)0819452017
One of the most common tasks in imageprocessing is to change the resolution of a picture. In this paper we present a new nonlinear method for interpolating digital images, which is particulary effective in the rendition of edges in natural and synthetic input. The algorithm is spatial variant and applies the warped distance (WaDi) concept, generalizing the technique to a two dimensional problem, which requires a non-separable approach. It consists of three separate stages. First of all the original image is analyzed to detect its local gradient characteristics;then edge asymmetry is computed at each output pixel position according to the WaDi technique, and it is compared to a reference sigmoidal edge: the local edge asymmetry straightforwardly determines the warping factor which is applied to the bi-dimensional. space of the image;eventually the actual interpolation is performed applying a conventional interpolator such as the linear or bicubic ones. The resulting interpolation method gives an output which does not present the usual blurring typical of images processed with linear interpolators and at the same time preserves the regularity of resized edges avoiding jagging artifacts. Moreover, the method adapts for zooming by a rational scaling factor. The paper is organized as follows. In the first section we introduce the problem of zooming digital images;the second section describes the state of the art;we continue describing the proposed method;then we propose a possible extension of the method to process color images;we end showing some examples of images interpolated with our method, and comparing these results with what can be obtained zooming the same input with other interpolators.
Lane detection plays a crucial role for Advanced Driver Assitance System (ADAS) or autonomous driving applications. Literature shows a lot of lane detection algorithms can work in real time with good results. However,...
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ISBN:
(纸本)9781479983391
Lane detection plays a crucial role for Advanced Driver Assitance System (ADAS) or autonomous driving applications. Literature shows a lot of lane detection algorithms can work in real time with good results. However, they require much computer processing and cannot be embedded in a vehicle ECU without deep software optimizations. In this paper, we discuss the embeddability of lane detection algorithms by comparing state-of-the-art algorithms in terms of functional performance and computational timing. We identify what essential parts of lane detection are time consuming, and show these parts can be computed in real time on embedded systems.
We address the problem of fast computation of level set partial differential equations (PDEs) in the context of motion segmentation Although several fast level set computation algorithms are known, some of them, such ...
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ISBN:
(纸本)0780367251
We address the problem of fast computation of level set partial differential equations (PDEs) in the context of motion segmentation Although several fast level set computation algorithms are known, some of them, such as the fast marching method, are not applicable to the video segmentation problem since the front being computed does not advance monotonically We study narrow-banding, pyramidal and a pyramidal/narrow-banding schemes that leads to a 70-fold time gain over the single-resolution scheme.
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