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The new robust image feature we use is the Morlet wavelet coefficients at feature points with the<jats:italic>k<\/jats:italic>\u2010largest local total variations in images. The Morlet wavelet coefficients are pseudo randomly permutated such that image hashes have a small collision rate and are difficult to analyze by attackers. The Morlet wavelet coefficients are further quantized using companding technique and binarily coded using Gray code to form the final hash.<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#sec1-5\">Experimental results<\/jats:ext-link>show the effectiveness and robustness of our method. The proposed image hash could have applications in image authentication and video signature. 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