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dsoprea

blockhash-go's Issues

Inaccuracy

It seems like something is off in the algorithm. The hash is sometimes correct, but not always.

Test code:

package main

import (
    "os"
    "fmt"

    "github.com/jessevdk/go-flags"

    "github.com/haochi/blockhash-go"
    "github.com/dsoprea/go-logging"
)

type options struct {
    Filepath string `short:"f" long:"filepath" required:"true" description:"File-path of image"`
}

func main() {
    o := new(options)
    if _, err := flags.Parse(o); err != nil {
        os.Exit(1)
    }

    f, err := os.Open(o.Filepath)
    log.PanicIf(err)

    defer f.Close()

    h, err := blockhash.Blockhash(f, 16)
    log.PanicIf(err)

    digest := h.ToHex()
    fmt.Println(digest)
}

Using the Blockbash Python tool with four images (two valley scenes and two sizes of each, where one is full-sized and the other is scaled to 100-pixels wide):

$ python blockhash.py ~/Downloads/*jpg
1ffc3fff00fe000021ff7e3f0f8007c03fff1f8d0f9806003ffc3ff80f0400f0  /home/dustin/Downloads/20170618_155330.jpg
1ffc3fff00fe000031ff3e3f0f8007c03fff1f8d0f9806003ffc3ff80f0400f0  /home/dustin/Downloads/20170618_155330-small.jpg
7ff00fe00ff007e00ffd07f807f003f003fc07fa07f413f017f927e261cce0d8  /home/dustin/Downloads/amazing-mountain-valley-wallpaper-29910-30628-hd-wallpapers.jpg
7ff00fe00fe007f00ffd07f807f003f003fc07fa07f413f013f92fe261cce0d8  /home/dustin/Downloads/amazing-mountain-valley-wallpaper-29910-30628-hd-wallpapers-small.jpg

If I run the Go tool, I'l get:

$ go run blockhash-go-testing.go -f ~/Downloads/20170618_155330.jpg 
1ffc3fff007e000021ff3e3f0f8007c03fff1f8c0f9806003ffc3ff80f0000f0
$ go run blockhash-go-testing.go -f ~/Downloads/20170618_155330-small.jpg 
1ffc1fff007f000013ff3c3f0f8007c03ffa1f8e0f840e083ffc1ffc0fc00300
$ go run blockhash-go-testing.go -f ~/Downloads/amazing-mountain-valley-wallpaper-29910-30628-hd-wallpapers.jpg 
7ff00fe00fe007e00ffd07f807f003e003fc03fa07f413f013f92fe261c4e0d8
$ go run blockhash-go-testing.go -f ~/Downloads/amazing-mountain-valley-wallpaper-29910-30628-hd-wallpapers-small.jpg 
7ff00fe00fe007e007fc07f807f803f003fe03fe03f803f007fa1bf811f405e1

Notice that the full-size images have the same hashes as the Python tool, but the shrunk versions have a hash with a common-prefix (the first few characters are correct; the first seventeen characters in the first case and the first ten-characters in the other case) though the not all of the bytes match.

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