Diego Stiehl

SignWriting is a writing system for sign languages. It is based on visual symbols to represent the hand shapes, movements and facial expressions, among other elements. It has been adopted by more than 40 countries, but to ensure the social integration of the deaf community, writing systems based on sign languages should be properly incorporated into the Information Technology. This article reports our first efforts toward the implementation of an automatic reading system for SignWiring. This… Exibir mais

SignWriting is a writing system for sign languages. It is based on visual symbols to represent the hand shapes, movements and facial expressions, among other elements. It has been adopted by more than 40 countries, but to ensure the social integration of the deaf community, writing systems based on sign languages should be properly incorporated into the Information Technology. This article reports our first efforts toward the implementation of an automatic reading system for SignWiring. This would allow converting the SignWriting script into text so that one can store, retrieve, and index information in an efficient way. In order to make this work possible, we have been collecting a database of hand configurations, which at the present moment sums up to 7,994 images divided into 103 classes of symbols. To classify such symbols, we have performed a comprehensive set of experiments using different features, classifiers, and combination strategies. The best result, 94.4% of recognition rate, was achieved by a Convolutional Neural Network. Exibir menos

This article is result of a survey on the implementation of some of the basics of object orientation in C# programming language, looking for conceptually describe some of these foundation concepts by providing didactic examples using the language.

The thematic maps are generated with the intention of representing the variables in study, being used interpolators to determine their values in places not sampled. It is usually considered the kriging as the best interpolation method, but several works found good results for the methods inverse of the distance and inverse-square-distance. The evaluation of the best method usually consists of comparing the estimated values for interpolation with the sampled ones. However, the visual aspect of… Exibir mais

The thematic maps are generated with the intention of representing the variables in study, being used interpolators to determine their values in places not sampled. It is usually considered the kriging as the best interpolation method, but several works found good results for the methods inverse of the distance and inverse-square-distance. The evaluation of the best method usually consists of comparing the estimated values for interpolation with the sampled ones. However, the visual aspect of the map created is also relevant, and the smoothness of the outline curves, an item to be taken into account, because it facilitates the visual interpretation and the site-specific of agricultural inputs in the agriculture. The objective of this work was to evaluate the smoothness of three thematic maps, created by different interpolators, built through corn yield data in an area of 13.2 ha. The selected interpolators were kriging, inverse of the distance, and inverse-square-distance. The evaluation was accomplished through the smoothness index, proposed in this article that calculates the frequency of classes’ change of the thematic map in the directions horizontal, vertical and of the diagonals, through software built for this purpose. The index was shown efficient in the determination of the smoothness of thematic maps. Exibir menos