6. The method of claim 1 , further comprising determining a click to hover ratio for the image and search query pair, the click to hover ratio being a ratio of the click count to the hover count for the image and search query pair, wherein the quality measure is based on the click to hover ratio.
6. The method of claim 1 , further comprising determining a click to hover ratio for the image and search query pair, the click to hover ratio being a ratio of the click count to the hover count for the image and search query pair, wherein the quality measure is based on the click to hover ratio. 7. The method of claim 6 , wherein determining the quality measure for the image with respect to the search query comprises: providing the click count as an input to an image ranking process that generates an initial quality score for the image and the search query pair based at least on the click count; and adjusting the quality score using the click to hover ratio to determine the quality measure.