Non-hotorealistic Rendinbased On Image

In recent years, computer non-photorealistic rending technology developed out ofcomputer graphics, attracted many researchers’ eyes, beyond the realistic renderingtechnology and has been one of the hottest topics in the field of computer drawing,non-photorealistic rending can express the effect which realistic rending can notexpressed. however, computer non-photorealistic rending still has many disadvantagesuch as line painting is discontinuous, too much noise, narrow applicable scope,complicated human-computer interaction, different from hand-drawing style, etc.Aimed at none flexible for line extract, this paper puts forward a method of combinefrequency filter algorithm with self quotient image algorithm to fulfillment lineextraction for line drawing; Aimed at different between computer sketch drawingsand Hand-drawing style, this paper puts forward a method sketch drawing with sketchtexture that has levels feeling.In method of line drawings, first, according to characteristics of Hand-drawingline, this paper presents a low-pass filter with band-pass modified and combined itwith self quotient algorithm to extraction edge line, Use method of low-pass filtermodified by band-pass to do processing of images, we can get outline image, todivided the original image by filtering results image,and revised, we can get linedrawings effect. The result is similar to hand-drawing stroke style, and we can adjustwidth of line on the basis of need. This method can present characteristic ofhand-drawing lines, and we can adjust the line width through parameters, lots ofexperiments show that this method was feasibility and applicability.In method of sketch drawing, because of traditional method of computer sketchrendering cannot present the sketch texture, and more different with style ofhand-draw sketch, this paper puts forward a method of the sketch drawing that cangeneration texture with levels feels according to the sketch texture characteristics, andrealized this thought through two ways of space domain processing and frequencydomain processing. Space domain of levels feeling sketch rendering use high-orderdifferential operator to extract lines, inflation line and then subtract the former line to generate double edge line, and do exercise fuzzy to double edge line, then we canobtain sketch texture with levels feeling, combined with edge line to generate sketchimage. Frequency domain levels feeling sketch rendering algorithms use high-passfilter with band-pass modified to extract image edge, adjust edge width throughcontrol parameters, then subtract results of different width lines, that can get doubleedge line, do exercise fuzzy to double edge lines and combine all the result with edgeline, we can get levels feeling sketch image. Algorithm of levels feeling sketchrendering pay more attention to sketch texture expression, and closer to hand-drawstyle. There have bigger difference between Space domain sketch rendering andfrequency sketch rendering too, different in result different in scope of application,etc. Lots of experiments proved that both of them are feasibility and applicability.Compared with other methods, we can see that the result generate by the method ismore close to hand-drawing style.