USA As Represented By Secretary Of The Navy

Gracie Bay Young

Bryan D Bagnall

Shibin Parameswaran

Corey A Lane

Methods for detecting a horizon in an image with a plurality of pixels can include the step of blurring the image with a noise filter, then dividing the image into an M&#xd7;N matrix of sub-blocks S. For each sub-block S, horizon features can be coarse-extracted by defining an r-dimensional vector having P feature values for each sub-block S and clustering each r-dimensional vectors into two clusters using a k-means statistical analysis. The corresponding sub-blocks S corresponding to the two clusters can be masked with a binary mask. The methods can further include the step of fine-extracting the horizon features at a pixel level for each sub-block Sand sub-block Swhen the binary mask changes value from sub-block Sto said sub-block S, for i=1 to M and j=1 to N.

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Gracie Bay Young