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Romil Bhardwaj

Ramachandran Ramjee

Krishna Chintalapudi

Ganesan Ramalingam

Gopi Krishna Tummala

This document relates to camera calibration. One example uses real-world distances and image coordinates of object features in images to determine multiple candidate camera calibrations for a camera. This example filters out at least some of the multiple candidate camera calibrations to obtain remaining calibrations, and obtains a final calibration for the camera from the remaining calibrations

Automatic camera calibration

A 'Skip-Correlator' ensures carrier sensing symmetry between wireless devices of arbitrary transmission power levels, thereby enabling fair sharing of available spectrum of a wireless channel between the wireless devices. In various implementations, receivers of a wireless device receive wireless preambles from neighboring wireless transmitters. This preamble includes an indication of a transmission power level of the neighboring wireless transmitter. The wireless device then selects and correlates a subset of samples of the received preamble as a function of a transmission power level of that wireless device. The remaining samples of the preamble are skipped by the receiving wireless device, hence the use of the term 'Skip-Correlator.' Further, the wireless device computes a total preamble energy of the correlated samples of the received preamble. Finally, the wireless device implements carrier sensing symmetry between itself and the neighboring wireless transmitter as a function of the total preamble energy.

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Bengaluru, India

Romil Bhardwaj