SketchyDataset_README.md

Sketchy Database - Rendered sketches and augmented photos

Contents: photo - a directory containing two different renderings of all photographs contained within the Sketchy Database sketch - a directory containing six different renderings of all sketches contained within the Sketchy Database

Photographs All photographs are rendered in JPEG format. Resizing is performed via OpenCV Imgproc (typically area interpolation for full images renderings and cubic for bounding box renderings).

Augmentations (directories within 'photo')

tx_000000000000 : image is non-uniformly scaled to 256x256
tx_000100000000 : image bounding box scaled to 256x256 with
                  an additional +10% on each edge; note 
                  that due to position within the image,
                  sometimes the object is not centered

Sketches All sketches are rendered in PNG format. The original sketch canvas size is 640x480. In rendering the sketch to a 256x256 canvas, we take the original photo aspect ratio as well as the original sketch canvas aspect ratio into account. We render sketches such that they are consistent with the transformation made to the image (non-uniform scale to 256x256). In order to ensure sketches remain fully on the canvas, some minor adjustments to scale and/or location are occasionally necessary. All sketches are rendered using custom OpenGL code, with a PNG encoding provided by Java's ImageIO API.

Augmentations (directories within 'sketch')

tx_000000000000 : sketch canvas is rendered to 256x256
                  such that it undergoes the same
                  scaling as the paired photo
tx_000100000000 : sketch is centered and uniformly scaled 
                  such that its greatest dimension (x or y) 
                  fills 78% of the canvas (roughly the same
                  as in Eitz 2012 sketch data set)
tx_000000000010 : sketch is translated such that it is 
                  centered on the object bounding box
tx_000000000110 : sketch is centered on bounding box and
                  is uniformly scaled such that one dimension
                  (x or y; whichever requires the least amount
                  of scaling) fits within the bounding box
tx_000000001010 : sketch is centered on bounding box and
                  is uniformly scaled such that one dimension
                  (x or y; whichever requires the most amount
                  of scaling) fits within the bounding box
tx_000000001110 : sketch is centered on bounding box and
                  is non-uniformly scaled such that it 
                  completely fits within the bounding box