Reconstruction of flange ellipses to detect misalignment

An apparatus comprising a non-transitory, computer readable, storage medium that stores instructions that, when executed by at least one processor, cause the at least one processor to perform operations comprising:

• applying a smoothing filter to an image comprising a flange joint;
• detecting at least two edges corresponding to respective flanges of the flange joint by downscaling the image and detecting edges in the downscaled image, wherein the detected edges are identified in a binary image;
• applying a transformation to extract a first ellipse and a second ellipse corresponding to the at least two detected edges identified in the binary image, wherein a size of the downscaled images is iteratively increased, edges detected at each iteration, and ellipses extracted based on the detected edges until ellipses are extracted from an original size image;
• estimating a position and an orientation of the first ellipse and the second ellipse extracted from the original size image;
• and
• quantifying an alignment of the flanges based on a position and an orientation of the first ellipse and the second ellipse.

A system, comprising:

• one or more memory modules;
• one or more hardware processors communicably coupled to the one or more memory modules, the one or more hardware processors configured to execute instructions stored on the one or more memory modules to perform operations comprising:
• applying a smoothing filter to an image comprising a flange joint;
• detecting at least two edges corresponding to respective flanges of the flange joint by downscaling the image and detecting edges in the downscaled image, wherein the detected edges are identified in a binary image;
• applying a transformation to extract a first ellipse and a second ellipse corresponding to the at least two detected edges identified in the binary image, wherein a size of the downscaled images is iteratively increased, edges detected at each iteration, and ellipses extracted based on the detected edges until ellipses are extracted from an original size image;
• estimating a position and an orientation of the first ellipse and the second ellipse extracted from the original size image;
• and
• quantifying an alignment of the flanges based on a position and an orientation of the first ellipse and the second ellipse.