| 摘要 |
An image processing apparatus for expanding the frequency band of enhancement to increase the effect of improvement of the image quality and realizing enhancement in two dimensions for an image signal by a simple circuit configuration, provided with a vertical high-pass filter, a vertical low-pass filter, a horizontal high-pass filter, and a horizontal low-pass filter as enhancers which extract high frequency components and low frequency components in vertical and horizontal directions, respectively and switches for appropriately selecting a signal of predetermined frequency components in the vertical and horizontal directions to enhance a signal of a predetermined frequency band. Accordingly, two-dimensional filtering is able to be achieved using one-dimensional filters in the vertical and horizontal directions and the enhancement effect can be improved by appropriately selecting the enhancement mode in accordance with the characteristic of the image signal.
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