The development of the program of detection and correction of quadrilateral objects on the set of images with the presentative projections

Anže Čerin (2010) The development of the program of detection and correction of quadrilateral objects on the set of images with the presentative projections. EngD thesis.

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Abstract

Subject of this bachelor's thesis is the development of a system capable of detecting presentative projections on the set of images and to correct their perspective in the way so that they are pointed directly to the viewer. During the development of the program we used methods of computer vision and computer graphics. Both are decribed in the first chapter. We describe some computer vison's aplications and how it connects with computer graphics. When describing computer graphic we focus on bitmap or raster graphic and how we can use it to present images or to manipulate with them. In the second chapter we describe in detail steps required to detect quadrilateral shapes such as presentative projections. We present multiple edge detection algorithms and line detection using Hough linear transformation. Next we show how to use lines to get line segments and then use them to define quadrilateral shapes on the image. Third chapter describes the perspective correction of the selected shape using perpective tranformation. In the end we present the developed program and it's practical usage.

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