Border Enhanced Screening Technology (BEST)

摘要

In the commercial printing industry, customers demand crisp sharp text and line-arts as well as vivid color pictures printed consistently on the same media at the same time. This demand in image quality requires that the design of the text and line-arts of sharp edge elements be preserved without aliasing; and the larger pictorial areas have excellent tonal gradation without noticeable artifacts (i.e.; moire, density contouring, appearance of course screening texture, etc). We have developed a multi-level screening method {Border Enhanced Screening Technology (BEST)} that utilizes an image structure classifier to identify pixels of different classes. Then a class-based adaptive screening technique (with multiple gray-level halftone choices), in combination with gray level anti-aliasing (GRET) method, is used to render stable, smooth and artifact free large area screens and accomplish anti-aliasing for pastel as well as saturated color edges at the same time. The BEST method has delivered excellent image quality.