First a novel sketch filter based on the maximum filter is proposed. The proposed sketch filter implicitly calculates the complexity of local area, and results in an image which expresses edges and ...textures as an artist draws a sketch with a pencil. It is then proposed to apply the sketch filter for edge feature extraction, colour pencil drawing, and the animation filtered image. The proposed algorithms work automatically without any interaction and demonstrate impressive results for rendering applications, while requiring a much smaller amount of computations compared to existing schemes.
This paper proposes a color pencil filter for non-photorealistic rendering applications. Our method is based on the sketch filter which can be used for feature extraction. Simulation results show ...that the proposed method results in very attractive and impressive images with small amount of computations.
We produce color pencil drawings from photographs using feature strokes to create the salient linear elements of the picture, and hatching strokes to fill areas. Both types of strokes are generated ...using line integral convolution (LIC). We improve previous LIC schemes by using feature lines to determine the integration direction, and by introducing grayscale noise into each CMY color channel. Our scheme can produce visually pleasing color pencil drawings in various styles.
