jst
446eea2f7b
Remove LUT based filters.
...
Caching kernel weights makes using the LUT based approach obsolete. Now they seem to be even slower than their counterparts.
2014-01-28 18:54:57 +01:00
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
