24. The method of claim 21 , wherein computing a Web page quality score comprises computing the Web page quality score based on a function of the initial quality scores and characteristics of the Web page.
21. A method, comprising: selecting, by a data processing device, a Web page for which a quality score is to be computed; computing, by a data processing device, initial quality scores for images that are presented with the Web page based on feature vectors for the images and an image classification model that is trained to provide image quality scores based on feature vectors; computing, by a data processing device, a Web page quality score based on a function of the initial quality scores; and computing, by a data processing device, an adjusted relevance score for the Web page based on the Web page quality score, wherein computing a Web page quality score comprises computing an average quality value for images that are presented with the Web page.