Research And Implement Of Image Quality Evaluation Method

Researches on evaluation of digital image quality are meaningful and basic for the image processing engineering. It not only is essential on theory importance, but also has taken an extensive appllication background, which makes the evaluation be paid much attention to. Especially, the rapid development of image compressing technology accelerates researches on quality evaluation of digital images.The dissertation introduces the concept of " image quality " .From the point of view of people eyes' visual characteristics, a new method to evaluate image quality based on the wavelet theory is puts forward and then its efficiency is proven,At first the author describes the concept of " image quality" detailedly, po i nts out the great sense of " image quality evaluation " . After the description of the development history and classification of the methods of image quality evaluation some typical methods is analyzed, their characteristics, good qualities and shortcomings are compared and summarized .The main goal of this dissertation is to present a new method of image quality evaluation based on wavelet transform. In Chap 3 people eyes' visual characteristics are described accurately and deeply from low-class visual feeling to high-class visual psychology. Wavelet transform, the theoretic base of the new method is introduced in Chap 4 with its concept and some properties explained. In Chap 5 the dissertation discusses the new method of image quality evaluation based on wavelet transform. The method describes and evaluates the quality of image through wavelet transform extracting luminance, definition and corelation. Compared with the traditional method it's evaluation effect will be more comprehensive and consistent with human perception. In the end, the experimental results prove that the method is accurate and efficient.