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US 7,023,450 B1Granted
Data processing method and apparatus for a display device
AssigneeThomson Licensing
InventorsSébastien Weitbruch, Carlos Correa, Rainer Zwing
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AssigneeThomson Licensing
InventorsSébastien Weitbruch, Carlos Correa, Rainer Zwing
Estimating the term…
With the new plasma display panel technology new kinds of artefacts can occur in video pictures due to the principle that brightness control is done with a modulation of small lighting pulses in a number of periods called sub-fields. These artefacts are commonly described as ‘dynamic false contour effect’. To compensate for this effect motion estimators are used and with the resulting motion vectors corrected sub-field code words are calculated for the critical pixels. Today's motion estimators work with the luminance signal component of the pixels. This is not sufficient for plasma displays. It is therefore proposed to make the motion vector calculation separately for the color components and with either the sub-field code words as data input or with single bit data input for performing motion estimation separately for single sub-fields or for a sub-group of bits from the sub-field code words. The proposal also concerns apparatuses for performing the inventive method.
Method for processing video pictures for display on a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein the time duration of a video frame or video field is divided into a plurality of sub-fields during the luminous elements can be activated for light emission in small pulses corresponding to a sub-field code word which is used for brightness control, wherein to each sub-field a specific sub-field weight is assigned, wherein the video signals for the pixels of a picture are sampled, said video signal samples are represented by video data words having N bits, wherein to the video data words sub-field code words are assigned having N+X bits, N and X being integer numbers, wherein with motion estimation motion vectors are calculated for pixels in a video picture, and these motion vectors are used to determine corrected sub-field code words for pixels, wherein, a motion vector calculation is being made separately for one or more colour components of a pixel, wherein for the motion vector calculation the sub-field code words having N+X bits are used as data input instead of the video data words having N bits for a colour component, and wherein the motion vector calculation is done based on the complete sub-field code words or based on code words that are formed from the entries in the sub-field code words of only a sub-group of sub-fields from the plurality of sub-fields and the motion vector defines a trajectory along which corrected sub-field code words will be placed.
Method for processing video pictures for display on a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein the time duration of a video frame or video field is divided into a plurality of sub-fields during which the luminous elements can be activated for light emission in small pulses corresponding to a sub-field code word which is used for brightness control, wherein to each sub-field a specific sub-field weight is assigned, wherein motion vectors are calculated for pixels in a video picture, and these motion vectors are used to determine corrected sub-field code words for pixels, wherein, a motion vector calculation is being made separately for one or more colour component of a pixel, and for the motion vector calculation the sub-field code words are used as data input instead of the video signal samples for a colour component, and wherein a motion vector calculation is done based on a single bit picture, wherein each pixel of the single bit picture is equal to a dedicated entry of the corresponding sub-field code word for that pixel, namely the entry for a dedicated single sub-field from the plurality of sub-fields.
Method for processing video pictures for display on a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein the time duration of a video frame or video field is divided into a plurality of sub-fields during which the luminous elements can be activated for light emission in small pluses corresponding to a sub-field code word which is used for brightness control, wherein to each sub-field a specific sub-field wieght is assisgned, wherein the pixels are represented by video data words having N bits, wherein to the video data words sub-field code words are assigned having N + X bits, N and X being integer numbers, wherein with motion estimation motion vectors are calculated for pixels in a video picture, and these motion vectors, are used to determine corrected sub-field code words for pixels, wherein, a motion vector calculation is being made separately for one or more clour components of a pixel, wherein for the motion vector calculation the complete sub-field code words having N + X bits or code words that are formed from the entries in the sub-fields code words of only a sub-group of sub-fields from the plurality of sub-fields are used as data input instead of the video data words having N bits for a colour component, and wherein the motion vector calculation is done based on the complete sub-field code words or based on said code words that are formed from the entries in the sub-field code words of only a sub-group of sub-fields from the plurality of sub-fields and the motion vector defines a trajectory along which corrected sub-field code words will be placed.
Dependencies are inferred from the claim text.