Commit Graph

5 Commits

Author SHA1 Message Date
Timmy Welch
1ca06a1968 Make compliant with python imagehash 2024-04-05 17:29:30 -06:00
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
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
7aba8954cd [goimagehash] First implement. 2017-07-31 22:47:14 +09:00