dhash

README

dhash

Difference hash of images, as described at http://www.hackerfactor.com/blog/index.php?/archives/529-Kind-of-Like-That.html.

Documentation

Index

• func Distance(h1, h2 Hash) int
• type Hash
  • func New(img image.Image) Hash
  • func Parse(s string) (h Hash, err error)
  • func (h Hash) String() string

Functions

func Distance

func Distance(h1, h2 Hash) int

Distance returns the number of bits different between two Hash values.

Types

type Hash

type Hash [2]uint64

A Hash is a 128-bit perceptual hash.

func New

func New(img image.Image) Hash

New returns a hash of img. The algorithm is the difference hash from http://www.hackerfactor.com/blog/index.php?/archives/529-Kind-of-Like-That.html.

func Parse

func Parse(s string) (h Hash, err error)

Parse takes the string representation of a Hash, and returns the corresponding Hash value.

func (Hash) String

func (h Hash) String() string