Kosuke Hiura

Bio: Kosuke Hiura is an academic researcher from Tohoku University. The author has contributed to research in topics: Digital image processing & Feature detection (computer vision). The author has an hindex of 1, co-authored 1 publications receiving 12 citations.

Natural image understanding using algorithm selection and high-level feedback

Abstract: Natural Image processing and understanding encompasses hundreds or even thousands of different algorithms. Each algorithm has a certain peak performance for a particular set of input features and configurations of the objects/regions of the input image (environment). To obtain the best possible result of processing, we propose an algorithm selection approach that permits to always use the most appropriate algorithm for the given input image. This is obtained by at first selecting an algorithm based on low level features such as color intensity, histograms, spectral coefficients. The resulting high level image description is then analyzed for logical inconsistencies (contradictions) that are then used to refine the selection of the processing elements. The feedback created from the contradiction information is executed by a Bayesian Network that integrates both the features and a higher level information selection processes. The selection stops when the high level inconsistencies are all resolved or no more different algorithms can be selected.

Fault Models in Reversible and Quantum Circuits

Abstract: In this chapter we describe faults that can occur in reversible circuit as compared to faults that can occur in classical irreversible circuits. Because there are many approaches from classical irreversible circuits that are being adapted to reversible circuits, it is necessary to analyze what faults that exists in irreversible circuits can appear in reversible circuit as well. Thus we focus on comparing faults that can appear in classical circuit technology with faults that can appear in reversible and quantum circuit technology. The comparison is done from the point of view of information reversible and information irreversible circuit technologies. We show that the impact of reversible computing and quantum technology strongly modifies the fault types that can appear and thus the fault models that should be considered. Unlike in the classical non-reversible transistor based circuits, in reversible circuits it is necessary to specify what type of implementation technology is used as different technologies can be affected by different faults. Moreover the level of faults and their analysis must be revised to precisely capture the effects and properties of quantum gates and quantum circuits that share several similarities with reversible circuits. By not doing so the available testing approaches adapted from classical circuits would not be able to properly detect relevant faults. In addition, if the classical faults are directly applied without revision and modifications, the presented testing procedure would be testing for such faults that cannot physically occur in the given implementation of reversible circuits. The observation and analysis of these various faults presented in this chapter clearly demonstrates what faults can occur and what faults cannot occur in various reversible technologies. Consequently the results from this chapter can be used to design more precise tests for reversible logic circuits. Moreover the clearly described differences between faults occurring in reversible and irreversible circuits means that new algorithms for fault detection should be implemented specifically for particular reversible technologies.

VLSI platform for real-world intelligent integrated systems based on algorithm selection

Abstract: A real-world intelligent system consists of three basic modules: environment recognition, prediction (or estimation), and behavior planning To obtain high quality results in these modules, high speed processing and real time adaptability on a case by case basis are required In each of the above mentioned modules, many different algorithms and algorithms networks exists and provide various performances on a case by case basis Thus, a mechanism that for any of the three computational stages selects the best possible algorithm is required We propose a platform based on the algorithm selection approach to the problem of natural image understanding This selection mechanism is based on machine learning; a bottom-up algorithm selection from real-world image features and a top-down algorithm selection using information obtained from a high level symbolic world description and algorithm suitability To accommodate the high-speed processing requirements, the high-frequency of real-time reconfiguration and a low-cost of implementation, we are using present a novel dynamic reconfigurable VLSI processor for real-time adaptation of the algorithm selection The new architecture includes a finegrain Digital Reconfigurable Processor, a distributed configuration memory to solve the data transfer bottleneck and an intra-chip packet routing scheme to reduce the size of the configuration memory

An algorithm selection based platform for image understanding using high-level symbolic feedback and machine learning

Abstract: Natural image processing and understanding encompasses hundreds of different algorithms Each algorithm generates best results for a particular set of input features and configurations of the objects/regions in the input image (environment) To obtain the best possible result of processing in a reliable manner, we propose an algorithm selection approach that selects the best algorithm for a each input image The proposed algorithm selection starts by first selecting an algorithm using low level features such as color intensity, histograms, spectral coefficients or so and a user given context if available The resulting high-level image description is analyzed for logical inconsistencies (contradictions) and image regions that must be processed using a different algorithm are selected The high-level description and the optional user-given context are used by a Bayesian Network to estimate the cause of the error in the processing The same Bayesian Network also generates new candidate algorithm for each region containing the contradiction in an iterative manner This iterative selection stops when the high-level inconsistencies are all resolved or no more different algorithms can be selected We also show that when inconsistencies can be detected, our framework is able to improve high-level description when compared with single algorithms In order for such complex and iterative processing being computationally tractable we also introduce a hardware platform based on reconfigurable VLSI that is well suited as the platform of the proposed approach We show that the algorithm selected approach is ideally suited for either a hybrid type VLSI processor or for a Logic-In-Memory processing platform

Bayesian-Network-Based Algorithm Selection with High Level Representation Feedback for Real-World Intelligent Systems

Abstract: A real-world intelligent system consists of three basic modules: environment recognition, prediction (or estimation), and behavior planning. To obtain high quality results in these modules, high speed processing and real time adaptability on a case by case basis are required. In the environment recognition module many different algorithms and algorithm networks exist with varying performance. Thus, a mechanism that selects the best possible algorithm is required. To solve this problem we are using an algorithm selection approach to the problem of natural image understanding. This selection mechanism is based on machine learning; a bottom-up algorithm selection from real-world image features and a top-down algorithm selection using information obtained from a high level symbolic world description and algorithm suitability. The algorithm selection method iterates for each input image until the high-level description cannot be improved anymore. In this paper we present a method of iterative composition of the high level description. This step by step approach allows us to select the best result for each region of the image by evaluating all the intermediary representations and finally keep only the best one.