Method of adaptive slicing signal

A video signal processing system for slicing binary data transmitted in a video signal is provided, comprising a synchronous separator, a line counter, a slicing signal generator and a comparator. The synchronous separator detects Hsync and Vsync carried in the video signal. The line counter generates an enable signal by counting the number of scanning lines based on the detected Hsync and Vsync, wherein the enable signal is activate when the video signal carrying teletext and/or other binary data. The slicing signal generator further comprises an extreme value detector determining local maximum values and local minimum values of the video signal, and a slicing level determiner generating an adaptive slicing signal based on the local maximum values and the local minimum values. The comparator enabled by the enable signal compares the video signal with the slicing signal.