A method for detecting the Bisection pattern for use in conjunction with the deinterlacing is to improve low angle direction detection capability. A method of Bisection pattern detection operates in an interlaced video containing both top and bottom fields. For each missing pixel in a current input field, a window W is constructed whose center pixel is at the considered missing pixel. A binary map is generated which includes rows of values corresponding to pixels in the window, wherein the values indicate if each element of the window is greater than the sample mean of the area surrounding the missing pixel. The number of value changes in the values in each row of the binary map is counted. It is then determined whether or not the missing pixel is within the Bisection pattern based on said counts. In order to maintain both the low angle edge direction detection capability and low misdetection probability, complicated areas are identified by the Bisection pattern detection method. Then deinterlacing is performed.