Application of gradient-based edge detectors to determine vanishing points in monoscopic images: Comparative study

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

doi:10.1016/j.imavis.2015.07.003

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Edge pixels are defined as a set of points (pixels) located on a curve that separates the neighboring points (pixels) or points (pixels) on the other side of the curve, which differ in brightness. The aim of the project was to detect local discontinuities in the brightness level and the outline of the research material [ 45 , 46 , 47 ]. The Kirsch mask consists of matching the perfect pattern to the edge pixels of the research material.…”

Section: Methodsmentioning

confidence: 99%

The Use of Image Analysis to Detect Seed Contamination—A Case Study of Triticale

Gierz

Przybył

Koszela

et al. 2020

Sensors

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Samples of triticale seeds of various qualities were assessed in the study. The seeds were obtained during experiments, reflecting the actual sowing conditions. The experiments were conducted on an original test facility designed by the authors of this study. The speed of the air (15, 20, 25 m/s) transporting seeds in the pneumatic conduit was adjusted to sowing. The resulting graphic database enabled the distinction of six classes of seeds according to their quality and sowing speed. The database was prepared to build training, validation and test sets. The neural model generation process was based on multi-layer perceptron networks (MLPN) and statistical (machine training). When the MLPN was used to identify contaminants in seeds sown at a speed of 15 m/s, the lowest RMS error of 0.052 was noted, whereas the classification correctness coefficient amounted to 0.99.

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Section: Methodsmentioning

confidence: 99%

The Use of Image Analysis to Detect Seed Contamination—A Case Study of Triticale

Gierz

Przybył

Koszela

et al. 2020

Sensors

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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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Strategies for the Calculation of the Circle Hough Transform in Low-Resources Systems

Ordoñez,

Pastore,

Blotta

2024

IFMBE Proceedings

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Application of gradient-based edge detectors to determine vanishing points in monoscopic images: Comparative study

Cited by 6 publications

References 29 publications

The Use of Image Analysis to Detect Seed Contamination—A Case Study of Triticale

The Use of Image Analysis to Detect Seed Contamination—A Case Study of Triticale

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

Strategies for the Calculation of the Circle Hough Transform in Low-Resources Systems

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