LADDER, a sketching language for user interface developers - Hammond and Davis
Summary
LADDER is a system that allows the specification of domain specific sketch recognition systems. Users begin by defining basic shapes. Each shape consists of a set of components, geometrics constraints on those components, component aliases, editing methods, and how the components are drawn. Shapes are defined hierarchically, beginning at the lowest level with predefined shapes such as line, circle, etc. Much like object oriented languages, abstract shapes can be defined forcing shapes that inherit from them to contain certain components or methods. Shape groups can also be defined, allowing for changes to one shape in the group to be reflected in all shapes in the group. The system provides not only a set of primitive shapes but also defines two sets of constraints. The first, consisting of constraints such as parallel, meet, etc., is rotation invariant, while the second (vertical, horizontal, etc.) is not. Several predefined editing methods and display methods, such as delete, rotate, or translate and original or cleaned strokes, are also defined. Users may also define a shape to contain a vector of subshapes, should a large or unknown number of these type of shapes be needed. Lowest level, predefined shapes are recognized in a domain independent manner and are added as facts to a Jess-based rule system whose rule are translated from the shape definition. As low level shapes are added as facts, the Jess system attempts to combine the shape with all others to generate a higher level shape. Once a high level shape has been fixed, its components are removed from the list of facts. If idealized representation is desired, the set of constraints associated with the shapes is solved via Mathematica.
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Summary and discussion of assigned readings for the Fall 20007 Sketch Recognition class
About Me
The Required Stuff
Year: PhD 3rd year
Email: p r i s c u s 2 7 @ gmail.com
Academic Interests: Neural Networks, Human Cognition, Manifold Learning
Relevant Experience: Classes - Machine Learning, Pattern Classification
Why are you taking this class?
Not only does the subject sound interesting, it also seems like a technology that will be very relevant to the future use of computers. Also, it sounded like a cool class to gain some knowledge in the area of human-computer interaction in a hands-on way.
What do you hope to gain?
A better understanding of how humans use handwritten/drawn information to communicate and also how we understand this information. How people recognize what is depicted.
5 to 10 years from now?
Not really sure. Hopefully I'll have graduated. I'd like to go into a teaching career, preferably at the university level, though teaching at a lower level of education and being able to provide an introduction to computer science at the high school or younger level would also be interesting.
Nonacademic interests:
Swing (and other forms of) dancing, Computer and console gaming, Sci-fi and fantasy literature.
Fun Story:
Since this has recently been told to everyone I know, I'll tell it. When I was about 5 or 6 years old, we were heading out to the car to go to church. I was dressed to the nines, new shoes, new slacks, a button up shirt, hair slicked back. My mom looks over at me and says, "Well Paul, you sure look sharp today." And I instantly burst into tears. Because as we all know, one of the very first things you learn is that sharp is very, very bad and you should never touch sharp things.
Email: p r i s c u s 2 7 @ gmail.com
Academic Interests: Neural Networks, Human Cognition, Manifold Learning
Relevant Experience: Classes - Machine Learning, Pattern Classification
Why are you taking this class?
Not only does the subject sound interesting, it also seems like a technology that will be very relevant to the future use of computers. Also, it sounded like a cool class to gain some knowledge in the area of human-computer interaction in a hands-on way.
What do you hope to gain?
A better understanding of how humans use handwritten/drawn information to communicate and also how we understand this information. How people recognize what is depicted.
5 to 10 years from now?
Not really sure. Hopefully I'll have graduated. I'd like to go into a teaching career, preferably at the university level, though teaching at a lower level of education and being able to provide an introduction to computer science at the high school or younger level would also be interesting.
Nonacademic interests:
Swing (and other forms of) dancing, Computer and console gaming, Sci-fi and fantasy literature.
Fun Story:
Since this has recently been told to everyone I know, I'll tell it. When I was about 5 or 6 years old, we were heading out to the car to go to church. I was dressed to the nines, new shoes, new slacks, a button up shirt, hair slicked back. My mom looks over at me and says, "Well Paul, you sure look sharp today." And I instantly burst into tears. Because as we all know, one of the very first things you learn is that sharp is very, very bad and you should never touch sharp things.
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