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
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
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
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
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
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
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
e96bbe5547
Unify filters and their dependencies
2012-09-15 20:24:14 +02:00
jst
eaf9383af0
filters.go simplified
2012-09-14 23:12:05 +02:00
jst
339b8fd43a
Speed up calculation by avoiding dynamic casting
2012-09-01 00:21:10 +02:00
jst
294efa80bb
Prevent resize from doing things multiple times if #CPUs > width
2012-08-23 19:36:02 +02:00
jst
9041d4db18
Function signature changed again, no need for multiple return value
2012-08-09 18:58:57 +02:00
jst
14d51db8b4
Changed function signature to include error handling. Filters simplified.
2012-08-08 21:32:51 +02:00
nfnt
f725c68998
fixed typo, thanks liuben
2012-08-06 21:49:02 +02:00
nfnt
2d612957ed
fixed typo
2012-08-03 18:22:12 +02:00
nfnt
fdc4a64918
Tests added
2012-08-03 18:12:26 +02:00
nfnt
428642c9f1
initial commit
2012-08-02 21:59:40 +02:00
