IMAGE DISPLAY DEVICE AND METHOD FOR COMPENSATION VIDEO QUALITY

An image display device and an image-quality compensating method are provided to perform the black stretch by applying an offset value of only a block which has lower brightness level, thereby increasing the contrast ratio without the loss of the maximum brightness level. A memory unit(10) stores an...

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Bibliographic Details
Main Author HEO, SO JEONG
Format Patent
LanguageEnglish
Published 27.04.2009
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An image display device and an image-quality compensating method are provided to perform the black stretch by applying an offset value of only a block which has lower brightness level, thereby increasing the contrast ratio without the loss of the maximum brightness level. A memory unit(10) stores an offset value corresponding to the mean value of a DC element. A scaler scales a video signal inputted from the outside. A DC calculator(20) calculates the ratio values of DC components of each block in the scaled video signal of a frame unit. A controller(30) sets up the offset value of a corresponding frame based on the mean value of ratio values calculated through the DC calculator, and then determines a block to which the set offset value will be applied based on the ratio values of each block. A black stretch performing unit(40) applies the set offset value to the determined block and then performs the black stretch.
Bibliography:Application Number: KR20070106144