Patent ID: 11885650
Assignee: IMETRUM LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  B  H | IPC B  G  H

Claim 21:
22. A motion encoder comprising:
a joint, the joint comprising:
a first part; and
a second part, the first part being movably mounted with respect to the second part to change the joint between a first joint condition and a second joint condition;

a first image capture device (ICD) comprising an array of light sensing elements arranged to generate images;
a processing unit; and
a pattern surface, the pattern surface defining or being arranged to define a pattern which moves relative to the first ICD between a first pattern position and a second pattern position as the joint changes between the first joint condition and a second joint condition, the pattern comprising pattern features,
wherein:
the first ICD has a field of view encompassing the first pattern position and the second pattern position such that the pattern features are visible to the first ICD in both the first pattern position and the second pattern position;
the processing unit is communicatively coupled to the first ICD to receive the images from the first ICD, the processing unit being configured to determine how image features corresponding to the pattern features transform between the received images to quantify the position and/or movement of the first part relative to the first ICD; and

the processing unit is configured to select image features to define the pattern features and to determine how the image features transform between the received images to quantify the position and/or movement of the first part relative to the first ICD.