Optical rangefinder for an electro-active lens
First Claim
1. A rangefinder operably coupled to an electro-active lens, the rangefinder comprising:
- a plurality of image sensor arrays where each of said image sensor arrays is covered by a focusing element having a fixed focal length to provide a desired focus at a different focal distance by measuring contrast of a focused sensed image received by the image sensor array; and
a controller connected to each of the plurality of image sensor arrays where the controller is used to measure the contrast of each of the image sensor arrays and electrical signals produced by adjacent pixels of each of the image sensor arrays are used by the controller to calculate contrast using a threshold sum of absolute differences algorithm to determine an appropriate optical power of the electro-active lens based on the measured contrast.
3 Assignments
0 Petitions
Accused Products
Abstract
Several devices for determining a distance of an object a user of an electro-active lens is looking at are presented. Once the distance is determined, the devices may alter the optical power of the electro-active lens to ensure that the object is correctly focused. Optical range finding is a possible means for carrying out this task. An active rangefinder may emit optical radiation from a transmitter directed at the object. The optical radiation may then be reflected off the object. The reflected optical radiation may then be received with an appropriate receiver. The received optical radiation may then be processed by appropriate circuitry to determine a distance to the object. A passive rangefinder works without a transmitter. Instead, an appropriate receiver receives ambient sources of light from the object. The received light may then be processed by appropriate circuitry to determine a distance to the object.
220 Citations
15 Claims
-
1. A rangefinder operably coupled to an electro-active lens, the rangefinder comprising:
-
a plurality of image sensor arrays where each of said image sensor arrays is covered by a focusing element having a fixed focal length to provide a desired focus at a different focal distance by measuring contrast of a focused sensed image received by the image sensor array; and a controller connected to each of the plurality of image sensor arrays where the controller is used to measure the contrast of each of the image sensor arrays and electrical signals produced by adjacent pixels of each of the image sensor arrays are used by the controller to calculate contrast using a threshold sum of absolute differences algorithm to determine an appropriate optical power of the electro-active lens based on the measured contrast. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification