Patent ID: 7965342
Filing Date: 2011-06-21
Classification: H04N

Abstract:
1. A video image display device displaying video images on the basis of video image data, the device comprising: an expansion factor deriving unit deriving and outputting an expansion factor for each frame of the video image data, for use in a luminance range expansion process for expanding a luminance range of the video image data on the basis of an image characterizing quantity related to the luminance of the video image data corresponding to the frame; a luminance range expansion processing unit performing the luminance range expansion process to the video image data on the basis of the expansion factor output from the expansion factor deriving unit; and a scene-change detecting unit detecting a change in a screen state of a present frame into a black screen state on the basis of the video image data and detecting a scene-change indicating that the scene of the video image has changed, wherein the expansion factor deriving unit is configured to: output an ideal expansion factor of the present frame determined on the basis of the image characterizing quantity related to the present frame when the scene-change is detected; output a first modified expansion factor of the present frame obtained by modifying the ideal expansion factor of the present frame in accordance with a predetermined first expansion factor modification rule when the scene-change is not detected and the change into the black screen state is not detected; and output a second modified expansion factor of the present frame obtained by modifying the ideal expansion factor of the present frame to a value smaller than the first modified expansion factor of the present frame in accordance with a predetermined second expansion factor modification rule when the scene-change is not detected and the change into the black screen state is detected.