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    • 68. 发明授权
    • Pixel density conversion and processing
    • 像素密度转换和处理
    • US5289293A
    • 1994-02-22
    • US492490
    • 1990-03-12
    • Masami KatoTakao KatoYasunori Hashimoto
    • Masami KatoTakao KatoYasunori Hashimoto
    • H04N1/40H04N1/405G06K9/00
    • H04N1/40075H04N1/40062H04N1/40068H04N1/4052
    • In a pixel density converting apparatus according to the present invention, a pixel density conversion element for converting a pixel density by a factor of an arbitrary value, such as an element of the projection method or the linear interpolation method, a pixel density conversion element for increasing or decreasing a pixel density by a factor of an integer, such as an element of the majority or logical OR method, and a binarization element for conducting binarization while correcting quantizing errors, such as an element of the error diffusion method or the average error minimizing method, are combined with each other with the advantages and disadvantages of the respective elements taken into consideration, so as to achieve excellent conversion whether or not the image on which pixel density conversion is conducted or an image area is a pseudo half-tone processed image. In consequence, excellent pixel density conversion is achieved on a binary image in which a pseudo half-tone processed image and characters or line drawings are present in a mixed state.
    • 在根据本发明的像素密度转换装置中,像素密度转换元件用于将诸如投影方法的元素或线性内插法的任意值的像素密度的像素密度转换成像素密度转换元件, 增加或减少像素密度乘以整数因子,例如大多数或逻辑OR方法的元素,以及用于在校正量化误差的同时进行二值化的二值化元素,例如误差扩散方法的元素或平均误差 最小化方法相互结合,考虑到各个元件的优点和缺点,以便无论进行像素密度转换的图像还是图像区域都是伪半色调处理,实现优异的转换 图片。 因此,在混合状态下存在伪半色调处理的图像和字符或线图的二进制图像上实现了优异的像素密度转换。