Use of discrete gradient operators for the automatic determination of vanishing points: Comparative analysis

Rojas‐Sola, José Ignacio; Romero-Manchado, Antonio

doi:10.1016/j.eswa.2012.03.059

Cited by 3 publications

(1 citation statement)

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“…Establishing vanishing points plays an important role not only in perspective creation but also in the reverse process that is the reconstruction of perspective [13,14]. Therefore, several works deal with automatic detection of the vanishing points in monoscopic image, which is the first step to three dimensional data extraction [15][16][17]. Much work has been done in the field of perspective analyses and perspective construction of the architectural environment onto a single flat projection plane [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Computer-Aided Panoramic Images Enriched by Shadow Construction on a Prism and Pyramid Polyhedral Surface

Dzwierzynska

2017

Symmetry

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Abstract:The aim of this study is to develop an efficient and practical method of a direct mapping of a panoramic projection on an unfolded prism and pyramid polyhedral projection surface with the aid of a computer. Due to the fact that straight lines very often appear in any architectural form we formulate algorithms which utilize data about lines and draw panoramas as plots of functions in Mathcad software. The ability to draw panoramic images of lines enables drawing a wireframe image of an architectural object. The application of the multicenter projection, as well as the idea of shadow construction in the panoramic representation, aims at achieving a panoramic image close to human perception. The algorithms are universal as the application of changeable base elements of panoramic projection-horizon height, station point location, number of polyhedral walls-enables drawing panoramic images from various viewing positions. However, for more efficient and easier drawing, the algorithms should be implemented in some graphical package. The representation presented in the paper and the method of its direct mapping on a flat unfolded projection surface can find application in the presentation of architectural spaces in advertising and art when drawings are displayed on polyhedral surfaces and can be observed from multiple viewing positions.

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