Abstract: An image processing apparatus inputs analog YUV or RGB signals, which are controlled to automatically control a gain and have uniform levels of synchronous signals, into an ADC so that the dynamic range in the ADC is optimized. The image processing apparatus converts analog luminance and chrominance signals into digital luminance and chrominance signals, and includes an automatic gain control signal generating means, and a plurality of automatic gain control amplifiers. The automatic gain control signal generating means generates an automatic gain control signal, which controls the levels of the analog luminance and chrominance signals, using the level of a synchronous signal detected from a digital Y luminance signal output from the ADC. The automatic gain control amplifiers amplify the levels of an analog luminance and chrominance signals by predetermined values using the automatic gain control signal and transmit the amplified levels to the ADC.

Abstract: An image processing apparatus inputs analog YUV or RGB signals, which are controlled to automatically control a gain and have uniform levels of synchronous signals, into an ADC so that the dynamic range in the ADC is optimized. The image processing apparatus converts analog luminance and chrominance signals into digital luminance and chrominance signals, and includes an automatic gain control signal generating means, and a plurality of automatic gain control amplifiers. The automatic gain control signal generating means generates an automatic gain control signal, which controls the levels of the analog luminance and chrominance signals, using the level of a synchronous signal detected from a digital Y luminance signal output from the ADC. The automatic gain control amplifiers amplify the levels of an analog luminance and chrominance signals by predetermined values using the automatic gain control signal and transmit the amplified levels to the ADC.

Abstract: A video signal format converting apparatus is provided for doubling a horizontal/vertical frequency, and converting the composition ratio of a luminance signal and color-difference signals, by which both horizontal/vertical frequency-converted and frequency-unconverted input signals can be processed. In this apparatus, external input signals not yet scan frequency-doubled and those scan frequency-doubled are controlled to be all processed. Thus, various input signals can be processed, and an external input signal not yet scan frequency-doubled can be processed even without installing a special scan conversion device.