Patent ID: 11896441
Assignee: INTUITIVE SURGICAL OPERATIONS, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 4:
5. The measurement system of claim 3, wherein the respective similarity metric assigned to each individual candidate pixel block in the plurality of candidate pixel blocks is based on at least one of
a sum of absolute differences between each pixel in the individual candidate pixel block and a corresponding pixel in the pixel block of the user-selected 2D endpoint;
a sum of squared differences between each pixel in the individual candidate pixel block and the corresponding pixel of the pixel block of the user-selected 2D endpoint;
a normalized cross correlation between each pixel in the individual candidate pixel block and the corresponding pixel of the pixel block of the user-selected 2D endpoint;
a census transformation;
a rank transformation; and
a sum of absolute differences between horizontal and vertical gradients.