Digital processing apparatus and method for estimating horizontal sync included in video signal

The digital processing apparatus and method for extracting a horizontal sync of the video signal is disclosed. In the digital video signal processing apparatus, a synchronization level detection section detects a horizontal synchronizing position and the horizontal synchronization levels, based on the dynamics, and detects the level of the blank the blank level detection unit estimates the back porch interval. Accordingly, the threshold value generating unit which provides the basis for determining a candidate for the dynamics by updating to a threshold determined in accordance with the horizontal synchronizing level and a blank level of the estimated candidate masking unit determines the horizontal synchronizing position.