Canon Kabushiki Kaisha

Christine Anne Deller

Kieran Gerard Larkin

Stephen James Hardy

Matthew Raphael Arnison

David Peter Morgan-Mar

Geoffrey John Woolfe

Peter Vincent Wyatt

Sumit Bhandari

A method of determining one or more representative color encodings is disclosed. A set of color encoding clusters is determined for a plurality of candidate color encodings based on a clustering criterion related to one or more desired perceptual attributes of the plurality of candidate color encodings. Each candidate color encoding is assigned to one cluster within the set of color encoding clusters. A representative color encoding is determined for each cluster within the set of color encoding clusters depending on the candidate color encodings assigned to each cluster.

Colour encoding clustering

Disclosed is a method of determining at least one three-dimensional (3D) geometric parameter of an imaging device. A two-dimensional (2D) target image is provided having a plurality of alignment patterns. The target image is imaged with an imaging device to form a captured image. At least one pattern of the captured image is compared with a corresponding pattern of the target image. From the comparison, the geometric parameter of the imaging device is then determined. The alignment patterns include at least one of (i) one or more patterns comprising a 2D scale and rotation invariant basis function, (ii) one or more patterns comprising a 1D scale invariant basis function, and (iii) one or more patterns having a plurality of grey levels and comprising a plurality of superimposed sinusoidal patterns, the plurality of sinusoidal patterns having a plurality of predetermined discrete orientations. Also disclosed is a two-dimensional test chart for use in testing an imaging device, the test chart comprising a plurality of alignment patterns, at least one of said alignment patterns including one of those patterns mentioned above.

Geometric parameter measurement of an imaging device

Growing community of inventors

Mount Kuring-Gai, Australia

Christine Anne Deller