Calculate hash of an Image?

[harshita]

hi all,

i am trying to compare 2 images in an efficient manner using Qt/c++, how can i find the hash of an image?

i found this class QCryptographicHash that can be used but i am not sure, if this can be used then how do i convet the image say a Qimage to QByteArray?

Is there any thing similar available in c++?

thank u

[stampede]

how do i convet the image say a Qimage to QByteArray?

QImage has constBits() method that returns the pixel data, you can use it to construct the QByteArray, which you can pass to QCrypthographicHash.

Is there any thing similar available in c++?

C++ is a programming language, it has no built-in support for image processing.

[mnutt]

If you're just comparing images, QImage::cacheKey may be what you're looking for.