When graph Ramsey theory is viewed as a game, “Painter” 2-colors the edges of a graph presented by “Builder”. Builder wins if every coloring has a monochromatic copy of a fixed graph G. In the on-line version, iteratively, Builder presents one edge and Painter must color it. Builder must keep the presented graph in a class H. Builder wins the game (G,H) if a monochromatic copy of G can be force...

One of the difficulties in estimating optical flow is bias. Correcting the bias using the classical techniques is very difficult. The reason is that knowledge of the error statistics is required, which usually cannot be obtained because of lack of data. In this paper, we present an approach which utilizes color information. Color images do not provide more geometric information than monochromat...

The concentration of m o s t image processing courses is on the ziarious algorithms used t o alter an. input i m age or data t o produce a desired output image . Lit t le e,fforf is expended o n teaching th,e appropriate display methods that are required l o acmrate ly demonstrate th,e e fec t iveness of the processin,g algorithms under investigation. T h i s paper reviews the fumdameiilals of ...

The recognition of painted strokes is an important step in analyzing painted works of art like paintings, drawings and underdrawings. But even for art experts, it is difficult to recognize all drawing tools and materials used for the creation of the strokes. Thus the use of computer aided imaging technologies brings a new and objective analysis and assists the art expert in analyzing painted wo...

THE sEr OF oval portraits of members of the old Incorporation of Surgeons which hangs in the Royal College of Surgeons in Edinburgh was painted by Sir John Medina some time between about 1695 and 1710. Consideration of the general affairs of the Surgeons of Edinburgh in the late seventeenth century, and comparison with similar collections elsewhere suggests that these portraits were probably co...

Sir,—Most surgeons like darkness in the operating theatre while carrying out procedures such as cystoscopy, oesophagoscopy, laparoscopy, retinoscopy in children, fundus examination during operation for retinal detachment, etc. Relatively dark conditions are preferred for carrying out certain investigations in the radiology department and cardiovascular laboratory. Under these conditions the ana...

A multi-year research program is underway to develop and deliver spectral-based digital cameras for imaging cultural heritage at the National Gallery of Art, Washington DC and the Museum of Modern Art, New York. The cameras will be used for documentation, production imaging, and conservation science. Three approaches have undergone testing: a liquid-crystal tunable filter (LCTF) coupled with a ...