| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 97 === This thesis presents a gradient--based adaptive error diffusion
method with edge enhancement effect while preserving the smoothness
effect. The proposed method not only can modulate the threshold in
halftoning dynamically but also can determine the weights of the
error diffusion filter adaptively to diffuse the quantization error
to neighboring pixels properly. Under six testing images,
experimental results demonstrate that our proposed new error
diffusion method has a good compromise between the edge enhancement
effect in the halftone image and the image quality effect in the
corresponding inverse halftone image when compared to the methods by
Floyd--Steinberg, Eschbach and Knox, Hwang et al., Li, and
Feng et al., but it has some execution-time degradation.
|
|---|
