Paul Harrison's older publications


N Hurst and P Harrison (2007) Low-cost active heat storage. ReNew Magazine, Winter 2007, Melbourne, Australia.

P Harrison (2005) Image Texture Tools. PhD thesis, Monash University. download, software and videos

Three image texture operations are identified: synthesis of texture from a sample, transfer of texture from one image to another, and plausible restoration of incomplete or noisy images. As human visual perception is sensitive to details of texture, producing convincing results for these operations can be hard. This dissertation presents several new methods for performing these operations. With regard to texture synthesis, this dissertation presents a variation on the best-fit method [Efros and Leung, 1999, Garber, 1981] that eliminates the "skew" and "garbage" effects this method sometimes produces. It is also fast, flexible, and simple to implement, making it a highly practical method. Also presented is a simple and fast technique based on random collage. Both of these techniques can be adapted to transfer texture from one image to another. Next, a noise removal method that is guided by a model of an image's texture, in the form of a non-linear predictor, is presented. The method is applied to plausibly restoring the texture of images degraded by compression techniques such as palettization (e.g. GIF), and to the removal of Gaussian noise, with results comparable to state-of-the-art wavelet-based methods. Finally, a more abstract form of texture synthesis is examined, based on the arrangement of tiles of specified shape. This is used to show the origins of the artifacts seen in best-fit synthesis.

P Harrison (2002) Patchwork texture synthesis. Technical Report 2002/119, Monash University School of Computer Science and Software Engineering. download, software

In this technical report, a simple and fast method is described for the synthesis of texture from a sample. This method produces results comparable to those of more sophisticated methods. The basic principle employed is to piece together patches of a sample into a larger output texture. These patches are chosen at random, and have random shape. A method to disguise the edges of the patches is described. The texture synthesis method is applied to still images and video. Its application to texture transfer is also described.

P Harrison (2001) A non-hierarchical procedure for re-synthesis of complex textures. In WSCG'2001, pages 190-197, Plzen, Czech Republic, University of West Bohemia. download, extended version, software

A procedure is described for synthesizing an image with the same texture as a given input image. To achieve this, the output image is built up by successively adding pixels selected from the input image. Pixels are chosen by searching the input image for patches that closely match pixels already present in the output image. It is shown that the accurate reproduction of features in the input texture depends on the order in which pixels are added to the output image. A procedure for selecting an ordering which transfers large complex features of the input to the output image is described. This procedure is capable of reproducing large features even if only the interactions of nearby pixels are considered. The procedure can be altered to allow specification of the placement of particular features in the output texture. Several applications of this are described.