A versatile CLI tool that applies affine and projective transformations to images. Beyond simple resizing, you can rotate in-plane (angle α), rotate around the Y-axis with perspective projection (beta), scale by factor or target dimensions, and translate. The script computes the output bounding box, adjusts transformations so the result starts at (0,0), and resamples using your chosen interpolation method.
Transformations:
- In-plane rotation (
--angulo α) - Y-axis rotation with projection (
--beta β) - Uniform scaling (
--escala s) or explicit dimensions (--dim H W) - Translation, implicit in correction step
Interpolation methods:
- nearest neighbor (
vizinho) - bilinear (
bilinear) - bicubic (
bicubica) - Lagrange polynomials (
lagrange)
Operation on a 1544x2000 input image, resulting in a 4112x5160 output.
>>> time python3 transforma.py imagens/among.png -o saida.png -c r -a 22 -e 2 -b 20 -m vizinho
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Executed in 847.79 millis fish external
usr time 2.99 secs 0.00 millis 2.99 secs
sys time 0.14 secs 1.06 millis 0.14 secs
>>> time python3 transforma.py imagens/among.png -o saida.png -c r -a 22 -e 2 -b 20 -m bilinear
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Executed in 2.74 secs fish external
usr time 4.70 secs 0.00 millis 4.70 secs
sys time 0.35 secs 1.07 millis 0.35 secs
>>> time python3 transforma.py imagens/among.png -o saida.png -c r -a 22 -e 2 -b 20 -m bicubica
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Executed in 21.64 secs fish external
usr time 20.38 secs 10.88 millis 20.37 secs
sys time 3.51 secs 1.80 millis 3.51 secs
>>> time python3 transforma.py imagens/among.png -o saida.png -c r -a 22 -e 2 -b 20 -m lagrange
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Executed in 12.11 secs fish external
usr time 12.54 secs 0.00 millis 12.54 secs
sys time 1.85 secs 1.07 millis 1.85 secs