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resize
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103 Commits

Author SHA1 Message Date
jst 0c6a628df5 Resolve image artifacts due to wrong coefficient index lookup. 2014-09-15 11:50:59 +02:00
jst 581d15cb53 Fix parallel computation. 2014-08-20 21:12:39 +02:00
jst e950449c49 Fix wrong boundary calculation (bug #17) 
This fix doesn't currently work concurrently. This will be fixed in another commit.
 2014-08-20 20:54:59 +02:00
jst 03982f698d Merge branch 'charlievieth-master' 2014-08-13 20:13:24 +02:00
jst 220cad3343 Add simple test case for input image with non-trivial bounds. 2014-08-13 20:12:18 +02:00
jst 7f8a5419ae Merge branch 'master' of https://github.com/charlievieth/resize into charlievieth-master 2014-08-13 20:10:38 +02:00
Charlie Vieth df655f3f70 Merge branch 'YCC' 2014-08-12 16:11:40 -04:00
Charlie Vieth 08b124d541 Fix bound out of range panic. 2014-08-12 16:11:25 -04:00
Charlie Vieth 171c886e38 Merge branch 'YCC' 2014-08-12 14:41:55 -04:00
Charlie Vieth f03c78969b Fix YCC SubImage. 2014-08-12 14:41:20 -04:00
Charlie Vieth 3c164b34f4 Merge branch 'YCC' 2014-08-12 14:22:17 -04:00
Charlie Vieth acea8646b2 Fix error in YCC PixOffset and SubImage. 2014-08-12 14:22:06 -04:00
jst ccddecd1bf Merge branch 'charlievieth-master' 2014-08-05 18:01:45 +02:00
Charlie Vieth a5a6a66088 Merge branch 'refactor' 2014-07-30 02:09:28 -04:00
Charlie Vieth eefd4737aa Optimize YCbCr image resize 2014-07-30 02:08:58 -04:00
Charlie Vieth ee540982e0 Merge branch 'refactor' 2014-07-29 18:48:50 -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 be07665345 Update README.md 2014-07-19 14:00:14 +02:00
jst 299762ed77 Add unit tests for converter.go 2014-07-19 13:31:16 +02:00
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
jst bdfbbead13 Merge branch 'anisus-master' 
Fixes #14, regression from 494d8de4e5
 2014-06-18 19:05:59 +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 8aee0d995b Update README.md to mention resize.Thumbnail. 2014-01-30 20:03:15 +01:00
jst 079ed2e48a Merge branch 'master' of https://github.com/matrixik/resize into matrixik-master 2014-01-30 19:40:14 +01:00
jst a83cb40860 Remove some redundancies. 2014-01-28 19:53:26 +01:00
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
Dobrosław Żybort b744503c5c Add: thumbnail helper function 2013-11-27 22:40:16 +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