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We present a low-cost stereo vision implementation suitable for use in autonomous vehicle applications and designed with agricultural applications in mind. This implementation utilizes the Census transform algorithm to calculate depth maps from a stereo pair of automotive-grade CMOS cameras. The final prototype utilizes commodity hardware, including a(More)
Mobile phone services based on the location of a user have increased in popularity and importance, particularly with the proliferation of feature-rich smartphones. One major obstacle to the widespread use of location-based services is the limited battery life of these mobile devices and the high power costs of many existing approaches. We demonstrate the(More)
1. SUMMARY Google's App Inventor for Android (AIA) is a visual programming environment for creating mobile phone applications that is designed to be accessible and appealing to college non-majors taking introductory courses in computer science. Specifically, AIA provides a development environment similar to StarLogo TNG [7], Scratch [5], and Alice [2] but(More)
We present an indoor wireless localization system that is capable of room-level localization based solely on 802.11 network signal strengths and user-supplied training data. Our system naturally gathers dense data in places that users frequent while ignoring unvisited areas. By utilizing users, we create a comprehensive localization system that requires(More)
In this paper, we present a method for FPGA datapath precision optimization subject to user-defined area and error constraints. This work builds upon our previous research which presented a methodology for optimizing the dynamic range- the most significant bit position. In this work, we present an automated optimization technique for the least-significant(More)
— Currently, few tools exist to aid the hardware developer in translating an algorithm designed for a general-purpose processor into one that is precision-optimized for custom logic. This task requires extensive knowledge of both the algorithm and the target hardware. We present a design-time tool, Précis, which assists the developer in analyzing the(More)
We present a parameterized stereo vision core suitable for a wide range of FPGA targets and stereo vision applications. By enabling easy tuning of algorithm parameters, our system allows for rapid exploration of the design space and simpler implementation of high-performance stereo vision systems. This implementation utilizes the Census Transform algorithm(More)
and have found that it is complete and satisfactory in all respects, and that any and all revisions required by the final examining committee have been made. Date: In presenting this dissertation in partial fulfillment of the requirements for the Doctoral degree at the University of Washington, I agree that the Library shall make its copies freely available(More)