Sony Corporation

Masahiro Komoda

Ikuo Someya

Aya Takechi

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.

Image processing apparatus

A waveform equalizing filter unit includes a waveform equalizing filter with a plurality of taps each having a unitary delay element and a coefficient multiplier, a clock switching circuit for selecting a clock signal from at least two different frequencies, with the selected clock signal being fed to each of the unitary delay elements of the waveform equalizing filter, and a control circuit for selectively switching the tap coefficients of the coefficient multiplier in the waveform equalizing filter based upon which one of the different clock signals has been selected. A signal time adjuster is further included in a stage situated before the waveform equalizing filter that receives the input signal prior to being fed to the waveform equalizing filter to adjust the timing of the input signal in synchronism with the operation of selecting one of the different clock signal frequencies.

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Kanagawa, Japan

Masahiro Komoda