Abstract
Some image output devices, such as some printers, are bilevel representation equipments. When they are exchanged among different output devices, it is necessary to convert the resolution of images. The subsampling method is widely used as the resolution conversion method of digital image is different from other bilevel images in statistical character. This paper proposes the resolution conversion method of dithered images. In our scheme, at first, a multilevel image is prepared by applying the lowpass filter for the original dithered image. Secondly, a resolution conversion process is applied for the prepared multilevel image. Finally, dithering process is applied for the obtained image. Simulation results show that our method is effective for resolution conversion of a dithered image.
