关键词: 灰度化, 图像融合, 金字塔分解, 梯度域导向图像滤波（GGIF）

Abstract:

To preserve more original features after decolorization, this paper presents a new color-to-gray conversion algorithm based on multi-scale image fusion principles. The color image is decomposed into three monochrome channel images：R, G and B, the multi-scale image fusion model based on Gaussian-Lapacian pyramid is adopted to convert color image into gray image, the Gradient Domain Guided Image Filter（GGIF） is employed to eliminate the artifacts that may be produced by multi-scale fusion. The decolorization problem is transformed into a multi-scale fusion problem that preserves the image features of three monochromatic channels in a fusion image as far as possible. Experimental results show that the proposed algorithm is more sensitive to edge information compared with the existing state-of-the-art decolorization techniques, and can preserve the detailed features which are lost in the other methods in bright or dark areas.

Key words: color-to-gray conversion, image fusion, pyramid decomposition, Gradient Domain Guided Image Filter（GGIF）