| 摘要 |
PURPOSE:To accurately perform offset correction by finding a normal image data level as eliminating a noise component by subtracting an image correction value calculated from the transition of accumulated preservation data from image data, and adding bias data on it. CONSTITUTION:An input image signal provided with the image data of one scanning line and mask picture element data is converted to a digital signal by an A/D converter 18, and the mask picture element data is separated from the digital signal, and separated mask picture element data is accumulated and preserved in prescribed number of lines by an image correction value arithmetic means 20, and the image correction value is calculated from the transition of the accumulated preservation data. Thence, the image correction value is subtracted from the image data by the offset arithmetic means 20, and the bias data is added on it, and the normal image data level can be found as eliminating the noise component. In such a way, it is possible to obtain a sharp image from a corrected input image signal. |
