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Seam Carving Algorithm for content aware image resizing and object removal

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Content-Aware-Image-Resizing

Seam Carving Algorithm for content aware image resizing and object removal

Importance/Cost Matrix

two types of cost functions are implemented

  • get_cost_gradient.m computes image gradient as cost
  • get_cost_entropy.m computes cost as per pixel entropy considering 9-by-9 neighbourhood
original image gradient cost
images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/Broadway_tower_edit.jpg
images/lake/lake_seamcut.jpg images/lake/cost.jpg

Image Downsizing

  • seam_carving.m does reduction in width using seam carving
  • results below are for gradient cost matrix
original width : 1428 pixels reduced width : 1128 pixels reduced width : 714 pixels reduced width : 476 pixels
images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/Broadway_tower_edit.jpg
  • per pixel entropy generally works better than gradient but it is computationally expensive
original width : 470 pixels gradient cost, reduced width : 235 pixels entropy cost, reduced width : 235 pixels
images/lake/lake_seamcut.jpg images/lake/lake_seamcut_width_half.jpg images/lake/lake_seamcut_width_half_entropy.jpg

Image Upsizing

  • expand.m does increment in width using seam carving
  • if width is to be increased by x pixels, then width is reduced by x pixels first using normal seam carving and the deleted seams are duplicated in original image to get the resultant image with width increased by x pixels
original width : 1428 pixels increased width : 2142 pixels
images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/width_plus_700.jpg
original width : 464 pixels increased width : 696 pixels
images/street/street.jpg images/street/street_width_plus_230.jpg
original width : 520 pixels increased width : 2128 pixels
images/wave/wave.jpg images/wave/wave_width_plus_230.jpg

Object Removal

  • object_removal.m resize the image in such a way that specific object in the image is removed smoothly
  • bounding box over the object is given and the cost values of the pixels in the bounding box are made negative infinite to make every seam pass through the object
original object removed
images/broadway_tower/Broadway_tower_edit.jpg images/broadway_tower/Broadway_tower_edit.jpg
original object removed
images/dog/dog.jpg images/dog/remove.jpg

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Seam Carving Algorithm for content aware image resizing and object removal

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