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resize
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75 Commits

Author SHA1 Message Date
jst 9884534579 Cache kernel weights for each row. 
For each row the convolution kernel is evaluated at fixed positions around "u". By calculating these values once for each row, a huge speedup is achieved.
 2014-01-28 18:48:08 +01:00
jst 8f586c4f06 Add benchmarks to compare execution times. 
Run "go test -bench LargeJpegThumb" to benchmark all functions at once.
 2014-01-18 11:55:34 +01:00
jst 45368ad0cd Multiply instead of dividing 2014-01-17 23:14:37 +01:00
jst 314cea6612 Avoid temporaries to save some cycles. 2014-01-17 22:54:15 +01:00
jst 7c5018c82b Extract method "resizeSlice" to reduce duplicate code. 2014-01-17 19:05:30 +01:00
jst f8ec710330 Fix wrong calculation of second adjust parameter. 2013-11-23 18:38:06 +01:00
jst d9287fbcb6 Use x,y as coordinates of the origin image. 2013-11-23 18:02:18 +01:00
jst d1bef9bdb6 Refactoring 2013-11-18 20:19:56 +01:00
jst 494d8de4e5 Speedup calculation by exploiting the separability of the resizing filter. 
Should be ~5x faster! More optimization will follow.

before:
> go test -bench .
PASS
Benchmark_BigResizeLanczos3-4	       1	2438137093 ns/op
Benchmark_BigResizeLanczos3Lut-4	       1	1157612362 ns/op
Benchmark_Reduction-4	       2	 743950618 ns/op

after:
> go test -bench .
PASS
Benchmark_BigResizeLanczos3-4	       5	 403685685 ns/op
Benchmark_BigResizeLanczos3Lut-4	      10	 225539497 ns/op
Benchmark_Reduction-4	      10	 207004759 ns/op
 2013-11-18 19:54:31 +01:00
jst 4d25061069 Fixed yet another typo. 2013-07-08 21:06:48 +02:00
jst 252ccc84a2 Add benchmarks for Lanczos3Lut to compare it with Lanczos3 performance. 2013-07-08 20:55:46 +02:00
jst 098f882331 Fix a typo. 2013-07-08 20:55:20 +02:00
jst b272d51eaa Update README.md 2013-07-08 20:54:24 +02:00
jst a85ea9eaa8 Rename Lanczos functions using look-up tables to Lanczos2Lut, Lanczos3Lut and restore Lanczos2, Lanczos3 to give users the choice between higher speed or higher accuracy. 2013-07-08 20:48:20 +02:00
jst 9e5ed35b85 Move splineKernel function nearer to Lanczos definitions. 2013-07-08 20:40:36 +02:00
Geoff Adams c1b8c4986e Use a lookup table to speed up the Lanczos kernel 
Profiling the resize operation using Lanczos kernels showed that most of
the time was spent in the Sin function, which is called twice per
evaluation of the Lanczos kernel. Generating a lookup table and doing a
linear interpolation between table entries speeds up the resize by a
factor of 4.
 2013-07-04 02:28:43 -07:00
jst 33204d8746 Update README.md 2013-04-11 20:37:15 +02:00
jst c37f8f8470 gofmt 2013-04-09 21:59:02 +02:00
jst 62777ac833 Precalculate bicubic factors, save some cycles. 2013-04-09 21:31:31 +02:00
jst 6448fff2ee Generalize spline based filters 
This also fixes a quality issue with Mitchell-Netravali: A factor was
missing in the calculation.
 2013-04-04 22:32:33 +02:00
jst 5290c4773b Add Travis build status in README 2013-04-03 20:50:30 +02:00
jst 09f4012229 Add Travis integration 2013-04-03 20:42:17 +02:00
jst da95f74904 go fmt 2013-03-10 11:55:50 +01:00
jst 852f4a47e7 Merge branch 'no-image-shift' of http://github.com/jsummers/nfnt.resize 
Merge branch 'fix-canvas-size-issue'
 2013-03-10 11:33:44 +01:00
jst 84039c403b Test for correct canvas size. 2013-03-10 10:58:08 +01:00
jst b6fef854bc Merge branch 'improve-canvas-size' of http://github.com/jsummers/nfnt.resize into fix-canvas-size-issue 2013-03-10 10:46:06 +01:00
jst 82ab8b977c Make kernel the only dependency of convolution1d 2012-12-13 22:13:37 +01:00
jst e512502b3c Use range for more idiomatic Go 2012-12-13 21:55:44 +01:00
jst bf09bbe0a3 boolToUint: true -> 1 2012-12-11 20:35:47 +01:00
jst a32116ce4a Add documentation 2012-12-11 20:35:02 +01:00
jst 0c69e0e0b7 Change order of fields in filterModel 2012-12-11 20:24:30 +01:00
jst bf006ca38d Description added 
Describe filterModel interface,
Extract bool-to-int method
 2012-12-11 20:18:23 +01:00
jst 2d6edc049a Change ordering 2012-12-11 19:57:34 +01:00
jst cfcbeb4bb2 Use replicated border in genericConverter 2012-12-10 21:26:34 +01:00
jst dc1fcd1d24 gofmt 2012-12-10 19:52:41 +01:00
jst f6fa51fe2f Merge branch 'master' of https://github.com/nfnt/resize 2012-12-10 19:33:12 +01:00
jst 378e366327 Replicate border instead of using a constant 
Constant border could lead to wrong values alpha values with certain
configurations.
 2012-12-10 19:27:21 +01:00
jst dd1c157427 Include kernel boundary check 
Filter kernels should yield Zero if they are evaluted outside their
intended size. Though filterModel.Interpolate doesn't do this by design,
it's better to include it anyways.
 2012-12-10 18:56:53 +01:00
Jason Summers cdbd68f34f Improve the way the new canvas size is calculated 
If both dimensions are given, always use those dimensions, avoiding roundoff
error.

If only one dimension is given, slightly prefer rounding the other dimension
up, to rounding it down.
 2012-11-27 20:49:01 -05:00
Jason Summers 3d9094eb9e Center the resized image on the canvas, instead of shifting it slightly 2012-11-27 20:38:19 -05:00
jst 1169a8bfc3 Include samples in README.md 2012-11-14 22:08:45 +01:00
jst 3e06045c3f Speed up computation: Try to avoid Image.At() as much as possible -> specialized color access for some image types 2012-09-21 20:02:25 +02:00
jst c9865dedd2 Update README.md 2012-09-19 21:13:38 +02:00
jst 8d42efa983 Update README.md 2012-09-19 21:04:52 +02:00
jst e548f52385 Blur input image during downscaling by scaling the filter kernel to prevent moires in the output image 2012-09-19 21:03:56 +02:00
jst d0b2b9bc39 Added MitchellNetravali, changed Lanczos a bit 2012-09-19 19:32:00 +02:00
jst c980eecff5 Small simplification 2012-09-16 09:20:11 +02:00
jst c2daecb43a Update README.md 2012-09-15 20:41:05 +02:00
jst e96bbe5547 Unify filters and their dependencies 2012-09-15 20:24:14 +02:00
jst 3fc31c95cc Kernel simplified 2012-09-15 19:30:32 +02:00