We do not claim our signature is a versatile one suitable for every kind of images. It seems performing well with images containing clear structure relation, such as top sky verse bottom landscape. It will not be suitable for fine details as we can see from our discussion on tolerance to noise. The fine details, similar to noise, contain high frequency components. They will be suppressed by the integration.
Query results from Virage search engine.
The first one is the query image. We only use two projection lines of the image in our retrieval. When few lines are used, certain amount of information will be lost. Increasing the number of lines can certainly improve the performance but we need to see the trade-off between recall time and recall precision. Figure 6 .