A new scheme based on priori face knowledge and shift template method for fast face feature points extraction are presented in this paper. A fairly good accuracy and speed in detecting the feature points of eyebrows, ...
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ISBN:
(纸本)081941638X
A new scheme based on priori face knowledge and shift template method for fast face feature points extraction are presented in this paper. A fairly good accuracy and speed in detecting the feature points of eyebrows, eyes, nose and mouth have been achieved by a pair of complementary templates. It is shown by computer simulation that the scheme is very suitable for very low bit rate model-based image coding in real time applications.
In second generation image compression techniques the image to be compressed is first segmented. The pixels are divided into mutually exclusive spatial regions based on some criteria. After segmentation, the image con...
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This paper deals with the comparison in different motion vector coding methods suitable for motion compensated image communication systems. Both waveform and description coding techniques are presented and applied to ...
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ISBN:
(纸本)081941638X
This paper deals with the comparison in different motion vector coding methods suitable for motion compensated image communication systems. Both waveform and description coding techniques are presented and applied to a dense motion field. Only lossless compression is considered, and a reduction factor between 3:1 and 9:1 of the raw bit rate of the motion vectors can be reached. Although some of these techniques have already been used for the coding of motion information it would be greatly interesting to compare them in the same conditions, with intent to apply them to professional motion compensated applications as opposed to the particular case of motion compensated picture coding.
In this paper, we derive the optimal structuring elements of morphological filters in image restoration. The expected pattern transformation of random sets is presented. An estimation theory framework for random sets ...
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ISBN:
(纸本)081941638X
In this paper, we derive the optimal structuring elements of morphological filters in image restoration. The expected pattern transformation of random sets is presented. An estimation theory framework for random sets is subsequently proposed. This framework is based on the least mean difference (LMD) estimator. The LMD estimator is defined to minimize the cardinality of the expected pattern transformation of the set-difference of the parameter and the estimate. Several important results for the determination of the LMD estimator are derived. The LMD structuring elements of morphological filters in image restoration are finally derived.
This paper describes an object recognition technique based on the concept of local symmetry. A technique is described which can detect 1D features under situations of extreme low contrast. The effectiveness of the tec...
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ISBN:
(纸本)081941638X
This paper describes an object recognition technique based on the concept of local symmetry. A technique is described which can detect 1D features under situations of extreme low contrast. The effectiveness of the technique is shown through application to DNA autoradiographs. The technique is then expanded so that 2D objects can be located and then recognized. In the 2D case the resulting output of the technique is a locus which can be compared to those in a database. It is further shown how the technique is robust against changes in both scale and orientation.
A current topic in image coding is to investigate how the efficiency of conventional waveform coding can be improved by utilizing methods from image analysis, image segmentation, image understanding and computer visio...
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ISBN:
(纸本)081941638X
A current topic in image coding is to investigate how the efficiency of conventional waveform coding can be improved by utilizing methods from image analysis, image segmentation, image understanding and computer vision. A very promising approach to this problem is object- oriented analysis-synthesis coding and its combination with conventional waveform codecs (hybrid waveform/object-oriented coding). One of the most important key components needed for such a hybrid system is a reliable and generic image segmentation. In this context the underlying contribution presents an algorithm for segmenting objects in front of moving backgrounds. This algorithm is based on four subsequent processing steps which are explained in detail: pre-segmentation by using a Hough transform of conventionally estimated vector fields, global parameter mapping within the pre-segmented background area, compensation of the global background motion, thresholding and post-processing of the remaining DFD signal.
A new hybrid coding scheme for video sequences is presented. With the introduction of a fast quadtree motion segmentation algorithm, motion vectors are estimated with variable size block matching which produces better...
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ISBN:
(纸本)081941638X
A new hybrid coding scheme for video sequences is presented. With the introduction of a fast quadtree motion segmentation algorithm, motion vectors are estimated with variable size block matching which produces better performance considering both overhead motion information and motion compensated prediction error. Small blocks containing high motion activities are intraframe vector quantized, whereas large blocks representing smooth motion areas are first decimated and then interframe vector quantized. Simulation results demonstrate that the proposed scheme performs very well.
This paper describes a method for coding arbitrarily shaped image segments. The method uses an iterative technique based on the theory of successive projection onto convex sets to determine the best transform coeffici...
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The model-based image coding might be the potential method for very/ultra low bit rate visualcommunications. However, some problems still remain for video practice, such as a finer wireframe 3-D model, precise rule f...
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ISBN:
(纸本)0819416223
The model-based image coding might be the potential method for very/ultra low bit rate visualcommunications. However, some problems still remain for video practice, such as a finer wireframe 3-D model, precise rule for facial expressions analyzing, and automatic feature points extraction for real time application, etc. This paper proposes a feasible scheme of model-based image coding based on a deformable model which would be suitable for very/ultra low bit rates transmission. Meanwhile, some key techniques, such as automatic face feature point extraction based on a priori knowledge for real time applications and the method of AUs separation of a face on various expressions, is given.
A new version of the Fourier Convolution algorithm in Computed Tomography is created by modifying the filter function, considering the phantom as a matrix of square pixels and taking the ray sum width equal to the pix...
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ISBN:
(纸本)081941638X
A new version of the Fourier Convolution algorithm in Computed Tomography is created by modifying the filter function, considering the phantom as a matrix of square pixels and taking the ray sum width equal to the pixel side. Each ray sum has a number of pixels which are partially covered by the ray sum width. This creates a weighting factor which is the correlation vector between the scanning beams and the phantom pixels. Each pixel is reconstructed more than once in each projection. A comparison of the reconstructed variable between images obtained by using the Shepp and Logan filter and the modified filter is presented. Also, the comparison between the Fourier algorithm and the new version is illustrated to compare the image quality and the running time.
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