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SEAM-CARVING
DAMN GOOD IMAGE RESIZING ALGORITHM
REFERENCE
SOME INFORMATION
▸ Content aware-image resizing technique
▸ Presented in 2007
▸ By Shai Avidan and Ariel Shamir
▸ http://www.faculty.idc.ac.il/arik/papers/imret.pdf
DIFFERENT IMAGE RESIZING TECHNIQUES
COMPARISON. REDUCE WIDTH BY 200 PIXELS
Original Compressed
Seam-carving Cropped
INTERNALS
HOW SEAM-CARVING WORKS
1. Calculate “importance” (energy) of each pixel
2. Detect least important parts of an image
3. Remove them
1 2 3
1. CALCULATE PX “IMPORTANCE” OR ENERGY
DUAL-GRADIENT ENERGY FUNCTION
2. DETECT LEAST IMPORTANT PARTS OF AN IMAGE AND REMOVE IT
DYNAMIC PROGRAMMING
1 2
3
1,2. Find seam by computing the path of
minimum energy cost from one end of the
image to another.
3. Select correct seam path.
4. Remove seam from the image.
O(W * H)
THE END
‣ https://github.com/4lexvav/seam_carving
‣ https://seam-carve.herokuapp.com/
‣ http://www.faculty.idc.ac.il/arik/papers/imret.pdf
‣ http://www.cs.princeton.edu/courses/archive/fall13/
cos226/assignments/seamCarving.html
‣ https://en.wikipedia.org/wiki/Seam_carving

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Seam carving

  • 1. SEAM-CARVING DAMN GOOD IMAGE RESIZING ALGORITHM
  • 2. REFERENCE SOME INFORMATION ▸ Content aware-image resizing technique ▸ Presented in 2007 ▸ By Shai Avidan and Ariel Shamir ▸ http://www.faculty.idc.ac.il/arik/papers/imret.pdf
  • 3. DIFFERENT IMAGE RESIZING TECHNIQUES COMPARISON. REDUCE WIDTH BY 200 PIXELS Original Compressed Seam-carving Cropped
  • 4. INTERNALS HOW SEAM-CARVING WORKS 1. Calculate “importance” (energy) of each pixel 2. Detect least important parts of an image 3. Remove them 1 2 3
  • 5. 1. CALCULATE PX “IMPORTANCE” OR ENERGY DUAL-GRADIENT ENERGY FUNCTION
  • 6. 2. DETECT LEAST IMPORTANT PARTS OF AN IMAGE AND REMOVE IT DYNAMIC PROGRAMMING 1 2 3 1,2. Find seam by computing the path of minimum energy cost from one end of the image to another. 3. Select correct seam path. 4. Remove seam from the image. O(W * H)
  • 7. THE END ‣ https://github.com/4lexvav/seam_carving ‣ https://seam-carve.herokuapp.com/ ‣ http://www.faculty.idc.ac.il/arik/papers/imret.pdf ‣ http://www.cs.princeton.edu/courses/archive/fall13/ cos226/assignments/seamCarving.html ‣ https://en.wikipedia.org/wiki/Seam_carving