I. Alsaif khalil, salim AL-lella N. Studying The Noise Effect on Data Hiding Based on Contourlet Coefficients. IQJOSS [Internet]. 2013 Dec. 1 [cited 2025 Sep. 18];13(3):165-80. Available from: https://ojs.uomosul.edu.iq/index.php/stats/article/view/29320