Patent ID: 8063984
Filing Date: 2011-11-22
Classification: H04N

Abstract:
1. A subtitle detection apparatus comprising: a difference unit to provide an inter-field difference between a current field signal of an input video signal and the current field signal delayed by at least one field period; an integration unit to divide a screen into a plurality of regions, integrate the inter-field difference that is included in each of the plurality of regions, and provide an intra-region integration value; a first comparison unit to compare the intra-region integration value from the integration unit with a first comparison value in order to detect if a subtitle is detected in at least one of the plurality of regions; a dynamic range calculation unit to divide the screen into regions and calculates a dynamic range of luminance in each of the regions; a second comparison unit to compare the dynamic range calculated by the dynamic range calculation unit with a second comparison value, and to provide a dynamic range comparison result in units of the region; and an arithmetic unit to perform a logical operation between an integration value comparison result being a result produced by a comparison of the intra-region integration value and the first comparison value and the dynamic range comparison result, and to provide a result of the logical operation as a subtitle region detection signal.