lordwelch/goimagehash
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Author SHA1 Message Date
Dong-hee Na
14aa1e136f
dct: Improve DCT1D to O(nlogn) algorithm (#29) 
* hashcompute_test: Add benchmark

* dct: Improve DCT1D to O(nlogn) algorithm

AS-IS:
BenchmarkPerceptionHash-8  500  2893930 ns/op  456698 B/op  4455 allocs/op

TO-BE:
BenchmarkPerceptionHash-8  2000  890306 ns/op  456382 B/op  4455 allocs/op

reference: DCT type II, unscaled. Algorithm by Byeong Gi Lee, 1984.
 2019-03-19 13:52:44 +09:00
Dong-hee Na
c61f6c69fb .travis.yml: Update travis 2019-03-19 00:06:41 +09:00
Dong-hee Na
138a26ae46 README.md: Update README.md 2019-03-19 00:06:12 +09:00
Dong-hee Na
3e058be50d
hashcompute: Update Extend API (#28) 
* hashcompute: Update Extend API

- AverageHashExtend -> ExtAverageHash
- PerceptionHashExtend -> ExtPerceptionHash
- DiffrenceHashExtend -> ExtDiffrenceHash

* imagehash: Update load api
 2019-03-18 23:53:09 +09:00
Dong-hee Na
161b6f5676
hashcompute: Redesign XXXHashExtend API interface (#27) 2019-03-18 21:40:16 +09:00
Dong-hee Na
0876a2adc2
dct: Process dct algorithm in multiple goroutine (#26) 2019-03-18 21:09:40 +09:00
Dong-hee Na
47321c08d3
imagehash: Create a new API Bits() (#25) 2019-03-17 15:42:07 +09:00
Dong-hee Na
84eb1859d0
imagehash: Add new serialization API dump/load. (#24) 
Create a new APIs for serializing purpose which can use
standard io.Reader/io.Writer APIs.

ToString() API will be remain for debugging purpose and
ExtImageHashFromString, ImageHashFromString will be removed after next
version.

- New APIs are added: LoadExtImageHash, LoadImageHash, xxxHash.Dump
- These APIs are deprecated: ExtImageHashFromString, ImageHashFromString
 2019-03-17 11:34:56 +09:00
Dong-hee Na
7558e00b90 README.md: Update 2019-03-16 23:23:56 +09:00
Dong-hee Na
20cafe6017
hashcompute: Fix 64bits unaligned size case (#23) 2019-03-16 23:15:32 +09:00
Dong-hee Na
58a4aa88ab
hashcompute: Fix bit set index (#22) 2019-03-16 17:22:57 +09:00
Dong-hee Na
5f00903fec README.md: Update README.md 2019-03-16 01:01:25 +09:00
Dong-hee Na
bafc8a21c3 readme: Update readme.md 2019-03-16 00:54:05 +09:00
Dong-hee Na
5f56e8609c
DifferenceHashExtend: Implement DifferenceHashExtend (#21) 2019-03-16 00:47:57 +09:00
Dong-hee Na
b535580cae
AverageHashExtend: Implement AverageHashExtend and fix bugs (#20) 2019-03-16 00:26:38 +09:00
Alex
c41a59a872 add PerceptionHashExtend function (#18) 
goimagehash: Implement PerceptionHashExtend
 2019-02-08 18:02:25 +09:00
Dong-hee Na
81672d7016 .travis.yml: Update Go 1.11 2018-10-01 17:34:07 +09:00
Dong-hee Na
d41c941ded transforms: Fix the logic which getting a size of image 2018-08-19 16:35:17 +09:00
Dong-hee Na
9435cae35d
Update README.md 2018-05-12 00:53:41 +09:00
Dong-hee Na
6995fa9b0c goimagehash: Add test 2018-05-10 11:54:51 +09:00
Dong-hee Na
e588da1f67 goimagehash: Update README.md 2018-05-09 09:37:49 +09:00
Dong-hee Na
1903317145 goimagehash: Fix quickselect algorithm to pick median value. 2018-05-08 13:33:43 +09:00
Dominik Honnef
ad2b6ded3b Use bits.OnesCount64 when available 
Benchmark on i7-2600k, which has the POPCNT instruction:

name                 old time/op  new time/op  delta
DistanceIdentical-8  5.08ns ± 0%  1.01ns ± 1%  -80.07%  (p=0.008 n=5+5)
DistanceDifferent-8  81.5ns ± 2%   1.0ns ± 0%  -98.76%  (p=0.016 n=5+4)

Benchmark on Cavium Octeon, a MIPS64 platform with no dedicated
instruction:

name                 old time/op  new time/op  delta
DistanceIdentical-2   120ns ± 6%   144ns ± 5%  +19.93%  (p=0.008 n=5+5)
DistanceDifferent-2   656ns ± 4%   144ns ± 4%  -78.09%  (p=0.008 n=5+5)
 2018-05-02 23:52:38 +09:00
Dong-hee Na
7f23d56ee5 goimagehash: Add badge 2018-04-01 16:55:03 +09:00
Dong-hee Na
f148dae87d goimagehash: Add codecov 2018-04-01 16:53:44 +09:00
Dong-hee Na
be737c1d73 travis: Update golang version. 2018-03-02 18:38:42 +09:00
Dong-hee Na
dbc186a437 Update AUTHORS 2017-11-17 14:33:21 +09:00
Gustavo Brunoro
71a79d6ce7 added serialization unit tests 2017-11-17 09:56:54 +09:00
Gustavo Brunoro
139dd89622 renames hashKind to Kind on unit test 2017-11-17 09:56:54 +09:00
Gustavo Brunoro
40b64eda79 adds hex serialization methods to ImageHash 
The ToString and FromString methods create a string representation
of an ImageHash, following the format:
`<first letter of type>:<hex representation of hash`
 2017-11-17 09:56:54 +09:00
Dong-hee Na
22bcbf7685 goimagehash: Make go report card happy. 2017-08-04 01:05:13 +09:00
Dong-hee Na
b969cb59dc goimagehash: Fix typo. 2017-08-03 22:40:42 +09:00
Dong-hee Na
2b9c664be8 Update docs. 2017-07-31 23:29:35 +09:00
Dong-hee Na
7aba8954cd [goimagehash] First implement. 2017-07-31 22:47:14 +09:00
Dong-hee Na
7312a138c1 Initial commit 2017-07-29 02:15:59 +09:00