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Normalised Correlation Value after applying DCT

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amitesh kumar
amitesh kumar 2011-3-16
Hello everyone
i am applying image normalization technique and DCT technique for embedding and extraction watermark image. here i am getting Normalized Correlation with negative sign after extracting watermark image. e.g.
-0.9967
-0.9966
-0.9896
-0.9697
-0.9946
i just want to know that is it right or wrong ? why NC value is coming negative either due to applying DCT or image normalization ? plz clear my doubt.. thanks in advance

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