Calculate hash of an Image?

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

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

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

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Is there any thing similar available in c++?

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

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