Patent ID: 8416343

Claim:
A signal processing device for detecting, from input interlaced signals, a sequence in which same fields are repeated at a predetermined rate, said signal processing device comprising: a still/movement determining unit configured to calculate a difference evaluation value between each of a predetermined number of input fields to determine a smallest value and a second smallest value of difference evaluation values from among all difference evaluation values between each of the predetermined number of input fields, and to determine whether or not there is movement between the predetermined number of input fields based on the second smallest value of difference evaluation values the still/movement determining unit configured to determine that there is movement between two input fields when a difference between two inputs fields is greater than the second smallest value, and the still/movement determining unit configured to determine that there is no movement between two input fields when the difference between two inputs fields is less than the second smallest value; and a sequence determining unit configured to determine whether or not said predetermined number of fields fall under any one of a plurality of patterns classified based on the position of a repeated field in which said same field in said sequence is repeated as to said predetermined number of fields, and have a transition order making transition for each input of a field, based on a still position between fields regarding which determination has been made by said still/movement determining unit that said movement is not present, and to determine whether or not said pattern, regarding which determination is made that said predetermined number of fields fall under, is making transition in said transition order from said pattern regarding which determination was made that said predetermined number of fields from a predetermined number of times earlier fall under, thereby detecting said sequence from said interlaced signals.