Abstract: An image data decoding method of an image vertical blanking interval (VBI) and device thereof can adjust a run-in clock signal of data lines of teletext to a data phase of teletext data lines. The method can accurately decode data of the teletext data lines to avoid a phase bias and an erroneous decoding result. A main technical method to decode the data of the VBI is to extract the data of the teletext data lines to determine corresponding bit logical values of the image data and then to output a decode result and also output a phase adjustment value. The phase adjustment value is used to adjust a read phase value of the extracted image so as to synchronize a data phase in VBI.

Abstract: An image scaler includes a horizontal downscaler, a horizontal upscaler, and a vertical scaling unit. The horizontal downscaler is configured in front of the vertical scaling unit and the horizontal upscaler is configured in back of the vertical scaling unit, so as to operate in coordination with a selective control method. The selective control method controls an image input route depending on horizontal downscaling or upscaling requirements, so as to choose to go through or to bypass the horizontal downscaler or the horizontal upscaler to horizontally and vertically resize an image. In this way, the input signal is processed in only two stages, so that the present invention can not only reduce the process loading of the huge amount of the data volume in the final stage, and also can reduce power consumption.

Abstract: The present invention uses a 2D comb filter 20 to output a 2D chrominance signal C2d by comparing the current scan-line signals with the signals before and after the current scan-line signals. A 3D chrominance signal C3d is then acquired by directly subtracting two adjacent 2D image signals and then dividing by 2 to get an approximate chrominance signal C3d of the two 2D images. Ratio mixing is performed on the 2D chrominance signal C2d and the 3D chrominance signal C3d to output a near-actual chrominance signal. A chrominance variation value can be acquired by comparing the chrominance signals of the two adjacent images. Finally, an actual luminance signal of the current scan-line is separated by deducting the near-actual chrominance signal from the signals of the current scan-line to restore the luminance signal.

Abstract: A clamping system for clamping a video signal, wherein the clamping system uses a charge-pump unit in company with a digital clamping controller to clamp the potential of the video signal, prior to the video signal being input to a programmable gain amplifier and an A/D converter, so as to reach a desired level. The charge-pump unit provides two charge-pump circuits, wherein one charge-pump circuit supplies a strong burst to boost the potential of the video signal while the video signal is below a threshold value. Otherwise, the other charge-pump circuit supplies a weak burst to fine tune the potential of the video signal when the video signal has reached the threshold value.

Abstract: A digital signal processing system and method applied for chroma transition, wherein the method has the acts of: performing a difference process on an original chroma signal C to obtain a first difference signal C?; calculating an absolute value |C?| of the first difference signal C?; performing a difference process on the absolute value |C?| to obtain a second difference signal Ca?; determining whether the second difference signal Ca? is a positive signal or a negative signal; wherein based on a determined result, an optimized chroma signal is generated by either mixing the original input chroma signal C with a k-delayed chroma signal, or mixing the k-delayed chroma signal C[n?k] with a 2k-delayed chroma signal C[n?2k], where k is a constant.

Abstract: The present invention provides an adaptive Y/C separation circuit for video signal processing that is capable of correcting previous color discrepancy in separating the luminance (Y) and chrominance (C) signals from the color video signals. In the process, the correlation of video signals on referencing scanning lines is analyzed by transposing the chrominance signals onto a two-dimensional UV plane. A correlation coefficient is obtained through the analysis for adjusting the video signals in the direction of the actual chrominance level, thus separating the luminance and chrominance signals with relatively low cost circuit implementation.

Abstract: The image data synchronizer has a memory, an address write counter, an address read counter, a clock frequency modulator, and an analog/digital mixed value control oscillator. In order to prevent a read overhead to cause a disordered image, the analog/digital mixed value control oscillator is coupled to an output terminal of the clock frequency modulator to generate an output clock signal as the read clock signal for the address read counter in accordance with a clock adjustment value, so as to form the feedback compensation architecture.

Abstract: An image data decoding method of an image vertical blanking interval (VBI) and device thereof in accordance with the present invention can adjust a run-in clock signal of data lines of teletext to be corresponding to a data phase of teletext data lines. The present invention can accurately decode data of the teletext data lines to avoid a phase bias and an erroneous decoding result. A main technical method to decode the data of the VBI is to extract the data of the teletext data lines to determine corresponding bit logical values of the image data and then to output a decode result and also output a phase adjustment value. The phase adjustment value is used to adjust a read phase value of the extracted image, to feedback and adjust a phase of a sampling clock signal to synchronize a data phase in VBI.

Abstract: A clamping system for clamping a video signal, wherein the clamping system uses a charge-pump unit in company with a digital clamping controller to clamp the potential of the video signal, prior to the video signal being input to a programmable gain amplifier and an A/D converter, so as to reach a desired level. The charge-pump unit provides two charge-pump circuits, wherein one charge-pump circuit supplies a strong burst to boost the potential of the video signal while the video signal is below a threshold value. Otherwise, the other charge-pump circuit supplies a weak burst to fine tune the potential of the video signal when the video signal has reached the threshold value.

Abstract: A digital signal processing system and method applied for chroma transition, wherein the method has the acts of: performing a difference process on an original chroma signal C to obtain a first difference signal C?; calculating an absolute value |C?| of the first difference signal C?; performing a difference process on the absolute value |C?| to obtain a second difference signal Ca?; determining whether the second difference signal Ca? is a positive signal or a negative signal; wherein based on a determined result, an optimized chroma signal is generated by either mixing the original input chroma signal C with a k-delayed chroma signal, or mixing the k-delayed chroma signal C[n?k] with a 2k-delayed chroma signal C[n?2k], where k is a constant.

Abstract: A video regulating module and method for mitigating flicker of an LCD device, wherein the method has acts of: supplying a pure color signal contained with brightness and gray scale information to the LCD device; measuring optical characteristics of the LCD device; generating compensating parameters directed to the pure color signal; and storing the compensating parameters in the LCD device. Therefore, when a video signal is input to the LCD device, the stored compensating parameters are applied to compensate the video signal to eliminate the flicker problem and obtain superior image quality.