In the previous section we highlighted two problems present in the KTH-TIPS database, namely the cropping and the orange peel - background problems.
A further source of information degradation is problems with the automatic focus of the camera, and this severely limits the value of any image processing/classification result for those images. Scale 1 (subject closest to the camera) was probably chosen to have an insufficient camera-target distance. Furthermore, in an attempt to get patches which were in focus, non-central patches were often selected, implying that the estimate of camera-target distance is inaccurate. Indeed, one should not be too surprised if poor results are obtained with Scale 1.
Table 5 summarises the images with poor focus.
Further issues are