Hewlett-packard Development Company, L.P.

Universidade Federal De Pernambuco-ufpe

Universidade Federal De Pernambuco

Veronica Teichrieb

Scott A White

Marcelo Aita Riss

Walter Correia

André Silva

Francisco Simoes

Thiago Domingues

Thiago Chaves

Vinicius Castilho

Silvio Melo

Gustavo Charamba

Diogo Henriques

Joao Teixeira

Lucio Polese Cossio

João Paulo Silva Do Monte Lima

Gutemberg Barros

João Marcelo Xavier Natario Teixeira

Lucas Silva Figueiredo

Francisco Paulo Magalhaes Simoes

Thiago De Menezes Chaves

Lucas Valença Rocha Martins De Albuquerque

Lucas Oliveira Maggi

Gutenberg Barros

According to examples, an apparatus may include a processor and a non-transitory computer readable medium on which is stored instructions that may cause the processor to create a 2D reference mesh for an image of a curved visual mark, establish correspondences between finder pattern points in the curved visual mark and points of the 2D reference mesh, and determine a curved 3D mesh having a radius that results in a minimal reprojection error of a projective transform estimated for correspondences between the 2D reference mesh and the curved 3D mesh while the radius remains below a predefined upper limit. The instructions may also cause the processor to sample components of the curved visual mark in elements of the determined curved 3D mesh to form a 2D planar image of the curved visual mark and analyze the 2D planar image of the curved visual mark to read the curved visual mark.

Read curved visual marks

An example of a non-transitory computer-readable medium storing machine-readable instructions. The instructions may cause the processor to receive a three-dimensional (3D) object representation and subdivide it into a triangular grid. Curved triangles may be calculated for triangles in the triangular grid. The triangles may be subdivided and differences calculated between corresponding sections of the curved triangles and the received 3D object representation.

Determination of vertices of triangular grids for three-dimensional object representations

An example of a computer-readable medium is provided to store machine-readable instructions. The instructions may cause a processor to receive three-dimensional (3D) object representations of an object. The distance between points of a grid applied to 3D object representation and random points on the 3D object representation may provide a sampling error used in calculating a modeling accuracy between the 3D object representations.

Determination of modeling accuracy between three-dimensional object representations

Growing community of inventors

Recife, Brazil

Veronica Teichrieb