The Seam class handles calculation of seams and the removal of seams from images. As mandated by the specifications, it contains the methods verticalSeamShrink and horizontalSeamShrink. At this point, I have only made the constructors visible because they are very trivial, and I have made fastVSShrink and fastHSShrink visible because they are not required by the specifications and give relatively little information away that has not already been given away below.

Program Flow

I have outlined the flow of my program here. For the most part, each bullet point corresponds to a method call (I used ten semi-colons in verticalSeamShrink, and two belong to a for statement).

verticalSeamShrink

This method is required to accept a UWECImage argument. It carries out a simple list of tasks:

• Find the energy of every pixel.
• Find the minimum energy required to get to every pixel (the optimal path from the top of the image).
• Find the path to the bottom with the lowest energy (this is the seam).
• Draw the seam.
• Refresh the image on the screen.
• Pause, if necessary, to give the user a chance to see the seam.
• Remove the seam.
• Refresh the image on the screen.

horizontalSeamShrink

This method is also required to accept a UWECImage argument. It carries out a list of tasks similar to verticalSeamShrink:

• Create a transposed version of the image.
• Find the energy of every pixel. (on transpose)
• Find the minimum energy required to get to every pixel (the optimal path from the top of the image). (on transpose)
• Find the path to the bottom with the lowest energy (this is the seam). (on transpose)
• Draw the seam. (on original)
• Refresh the image on the screen.
• Pause, if necessary, to give the user a chance to see the seam.
• Remove the seam. (on transpose)
• Transpose the transposed image to restore it to its original orientation.
• Replace the original image with the second.
• Refresh the image on the screen.