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resize
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28 Commits

Author SHA1 Message Date
Charlie Vieth eefd4737aa Optimize YCbCr image resize 2014-07-30 02:08:58 -04:00
Charlie Vieth 427b8d133e Optimized Nearest-Neighbor function - 2x faster 2014-07-29 18:32:58 -04:00
Charlie Vieth 80b3fc2b3f Pre-calculate start offset, optimize bound check 
Increased performance by 30% for RGBA and 45% for Gray images, minor
performance increase for 16-bit images.

The start offset calculated by createWeights are stored in a slice and
passed to the resize functions to prevent duplication of effort.
 2014-07-29 16:53:35 -04:00
jst 016a61cd31 Optimize data-locality for a huge increase in processing speed. 
This is a complete rewrite! The tight scaling loop needs data locality for optimal performance. The old version used lots of pointer redirections to access image data which was bad for data locality. By providing the complete loop for each image type, this problem is solved. Unfortunately this increases code duplication but the result should be worth it: I could measure a ~6x speed-up for certain test cases!
 2014-07-19 13:19:31 +02:00
Accipiter Nisus f3cac2f865 Fix to resize correctly when source image.Bounds().Min is not (0,0) 2014-06-16 13:53:36 +10:00
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 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