Abstract: A synchronization detecting apparatus includes a counter, an error detector, and a line length generator. The counter counts to a predetermined counter value in response to a clock signal. The error detector generates an error, which is the difference between a current counter value received from the counter and a previous line length, in response to a synchronization flag signal. The line length generator generates a current line length based on a compensated error and the predetermined counter value. The synchronization flag signal has an active level at a transitioning edge of a synchronization pulse signal contained in an input signal.

Abstract: A video decoder removes noise caused by a luminance signal component when separating a chrominance signal from a composite video baseband signal. The video decoder includes a first signal generator generating a first signal, a second signal generator generating a second signal, a third signal generator differentiating the first and second signals and performing a predetermined operation on the differentiated signals to generate a third signal, an operating unit performing a predetermined operation on the third signal to output the chrominance signal, a fourth signal generator performing a predetermined operation on the first and second signals to generate a fourth signal having a value corresponding to the amplitude of the chrominance signal, and a noise removal unit correcting the chrominance signal in response to the third and fourth signals to remove luminance component noise included in the chrominance signal.

Abstract: In a display state control apparatus for automatically changing the frequency and the phase of a sampling clock signal according to changes in the phase and frequency of an input signal, and in a display state control method therefor, an optimal display state is maintained by automatically changing the frequency and phase of a sampling clock signal used to sample an input signal according to changes in the input signal. In this manner, user interaction is not required for generating the optimal display control signal.

Abstract: A synchronization detecting apparatus includes a counter, an error detector, and a line length generator. The counter counts to a predetermined counter value in response to a clock signal. The error detector generates an error, which is the difference between a current counter value received from the counter and a previous line length, in response to a synchronization flag signal. The line length generator generates a current line length based on a compensated error and the predetermined counter value. The synchronization flag signal has an active level at a transitioning edge of a synchronization pulse signal contained in an input signal.

Abstract: A video decoder removes noise caused by a luminance signal component when separating a chrominance signal from a composite video baseband signal.

Abstract: In a display state control apparatus for automatically changing the frequency and the phase of a sampling clock signal according to changes in the phase and frequency of an input signal, and in a display state control method therefor, an optimal display state is maintained by automatically changing the frequency and phase of a sampling clock signal used to sample an input signal according to changes in the input signal. In this manner, user interaction is not required for generating the optimal display control signal.

Abstract: An apparatus for separating luminance and chrominance signals from an NTSC composite video signal includes first through fourth delayers connected to a digital composite video signal in series for delaying input signals each by 1, a first filter for separating a first chrominance signal from signals output from the first and second delayers; a second filter for separating a second chrominance signal from signals output from the second and third delayers, a vertical edge direction detector for detecting a vertical edge direction by receiving signals output from the second and fourth delayers and receiving the digital composite video signal, a multiplexer for outputting one of the first and second chrominance signals based on a signal output from the vertical edge direction, a chrominance signal outputting unit for receiving the output of the multiplexer and then outputting a perfect chrominance signal, and a luminance signal outputting unit for receiving the signal of the second delayer and receiving the chrom

Abstract: An imaging apparatus and method provides a wide dynamic range and is capable of displaying an improved color in low-luminance regions, and an image signal processing method thereof. In the imaging apparatus, a first process divides the voltage level of an analog image signal into a plurality of sections and amplifies the analog image signal with a plurality of different gains according to each section, and a second process converts the analog image signal amplified with the different gains into a digital signal, and non-linearly gamma-corrects the digital signal according to each section. The plurality of different gains may be inversely proportional to the luminance level of the analog image signal. Thus, the level of an analog signal in a low-luminance region is amplified with a gain greater than in a high-luminance region before gamma correction, so that signal-to-noise (S/N) ratio in the low-luminance region of an image is increased, thereby improving sensitivity of the image following gamma correction.

Abstract: An analog-to-digital conversion apparatus includes a sampling clock generator and an analog-to-digital converter. The sampling clock generator receives a clock signal and generates a plurality of sampling clock signals in response to phase control signals. The analog-to-digital converter receives a plurality of analog signals, samples the received analog signals and outputs digital signals synchronized with the sampling clock signals outputted from the sampling clock generator. The sampling clock signals outputted from the sampling clock generator correspond to the analog signals respectively. Therefore, the analog-to-digital converter can sample the inputted analog image signal when the inputted analog image signal is in the stable state. Thus, the analog-to-digital converter can output the optimal digital signal.

Abstract: An apparatus and method for controlling focus using an adaptive filter are provided. The apparatus includes an adaptive low-pass filter for covering an image signal captured through the lens with a mask of a predetermined size, comparing brightness level differences between a central pixel located in the center of the mask and pixels adjacent to the central pixel with a threshold value, multiplying a weight calculated in response to the comparison result by the brightness level of a concerned pixel in the mask, adding together the multiplication results of all the pixels, and outputting the addition result as an adaptively low-pass filtered image signal. A high-pass filter filters a high-frequency component of the adaptively low-pass filtered image signal.

Abstract: An apparatus for separating luminance and chrominance signals from an NTSC composite video signal includes first through fourth delayers connected to a digital composite video signal in series for delaying input signals each by 1, a first filter for separating a first chrominance signal from signals output from the first and second delayers; a second filter for separating a second chrominance signal from signals output from the second and third delayers, a vertical edge direction detector for detecting a vertical edge direction by receiving signals output from the second and fourth delayers and receiving the digital composite video signal, a multiplexer for outputting one of the first and second chrominance signals based on a signal output from the vertical edge direction, a chrominance signal outputting unit for receiving the output of the multiplexer and then outputting a perfect chrominance signal, and a luminance signal outputting unit for receiving the signal of the second delayer and receiving the chrom

Abstract: An image frequency restoration system for a single CCD color video camera which comprises decorrelation modules, frequency restoration modules and a multiplexer. The decorrelation modules are for receiving degraded RGB component signals image-processed by the single CCD and outputting the RGB component signals decorrelated color components between individual channels. The frequency restoration modules receive the RGB component signals from the decorrelation modules, restore a frequency component lost in the channel and output the RGB component signals. Thus, signal detected by a single CCD is processed, compensated for degradation and restored to an original state.

Abstract: An image restoration system for a single CCD color video camera which comprises decorrelation modules, restoration modules and a multiplexer. The decorrelation modules are for receiving degraded RGB component signals image-processed by the single CCD and outputting the RGB component signals decorrelated color components between individual channels. The restoration modules receive the RGB component signals from the decorrelation modules, restore a frequency component lost in the channel and output the RGB component signals. Thus, signal detected by a single CCD is processed, compensated for degradation and restored to an original state.