ImageHash

MLModule

genre	Inspectors
author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLCrypto
definition	MLCrypto.def
keywords	sha, md5

Purpose

The module ImageHash computes the hash value of an input image.

Usage

The input source must be connected to a proper image source. The selected hashing and encoding algorithms are used to compute the hash.

Details

The hashes provided by this module are generated using a cryptography library. They are calculated from the binary representation of the image, independent of the page size, with voxels ordered ascending in the x, y, z, c, t, and u dimensions, respectively.

The main reason for using cryptographic hashes instead of the Checksum module is to have less probability for hash collisions.

Windows

Default Panel

Input Fields

input0

name: input0, type: Image

Image for which a hashkey should be computed.

Parameter Fields

Field Index

Auto Update: Bool

Hash: String

Hash Encoder: Enum

Hash Function: Enum

Update: Trigger

Valid: Bool

Visible Fields

Hash

name: hash, type: String, persistent: no

Shows the hash resulting from the input image.

Valid

name: hashValid, type: Bool, persistent: no

Shows whether the hash is valid.

Hash Function

name: hashSelector, type: Enum, default: SHA256

Defines the hash function.

Values:

Title	Name
Sha1	SHA1
Sha224	SHA224
Sha256	SHA256
Sha384	SHA384
Sha512	SHA512
Md5	MD5

Hash Encoder

name: encoderSelector, type: Enum, default: Base64

Defines the encoder used for the resulting hash.

Values:

Title	Name
Base64	Base64
Hex	Hex

Auto Update

name: autoUpdate, type: Bool, default: TRUE

Update

name: update, type: Trigger