Method and a device for converting a picture
First Claim
Patent Images
1. A method for converting a first picture composed of M (Mε
- ) pixels into a second picture composed of L pixels (Lε
, M≠
L), wherein the first picture and the second picture have corresponding content, said second picture having a pixel sequence to be displayed with an electronically controlled display provided for pixelwise display, said method comprising;
supplying for each jth (O≦
j≦
M-1) pixel of said first picture a first pixel value x(j);
dividing a first picture surface covered by said first picture into M first picture segments;
dividing a second picture surface covered by said second picture into L second picture segments;
multiplying each ith (O≦
i≦
L-1) second picture segment with a sharpness factor (W) in order to obtain each time a further ith second picture segment;
mapping each further ith second picture segment onto said first picture surface while maintaining the pixel sequence of the second picture, each mapped further ith second picture segment thus forming a further first picture segment within said first picture, the further first picture segments being non overlapping;
identifying within each further first picture segment those first picture segments belonging to the considered further first picture segment in order to form for each further first picture segment a set of k first picture segments including the identified first picture segments for the considered further first picture segment;
assigning to each of the k first picture segments of each set a weight factor h(k,i) indicating each time the surface amount of the considered kth first picture segment contributes to the further ith second picture segment;
applying to each of the first pixel values x(j), a first transfer function component (T), wherein said first transfer function component is not a γ
correction function component;
determining each ith second pixel value y(i) by summing the k first pixel values x(j) of the considered set weighed with the assigned weight factor h(k,i);
applying to each of said second pixel values y(i), a second transfer function component (T'"'"').
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Abstract
A method and a device for converting a first picture composed of M pixels towards a second substantially identical picture composed of L pixels (MεN, LεN, M≠L) which are destined for pixelwise representation, wherein each Kth first pixel value is weighed with a weight factor h(k,i) determined by means of projection of the second picture on the first picture and wherein before the second pixel value y(i) is determined a first transfer function component (T) is added to each kth first pixel value and after determining the second pixel value y(i) a second transfer component (T'"'"') is added to that pixel value.
22 Citations
22 Claims
-
1. A method for converting a first picture composed of M (Mε
- ) pixels into a second picture composed of L pixels (Lε
, M≠
L), wherein the first picture and the second picture have corresponding content, said second picture having a pixel sequence to be displayed with an electronically controlled display provided for pixelwise display, said method comprising;supplying for each jth (O≦
j≦
M-1) pixel of said first picture a first pixel value x(j);dividing a first picture surface covered by said first picture into M first picture segments; dividing a second picture surface covered by said second picture into L second picture segments; multiplying each ith (O≦
i≦
L-1) second picture segment with a sharpness factor (W) in order to obtain each time a further ith second picture segment;mapping each further ith second picture segment onto said first picture surface while maintaining the pixel sequence of the second picture, each mapped further ith second picture segment thus forming a further first picture segment within said first picture, the further first picture segments being non overlapping; identifying within each further first picture segment those first picture segments belonging to the considered further first picture segment in order to form for each further first picture segment a set of k first picture segments including the identified first picture segments for the considered further first picture segment; assigning to each of the k first picture segments of each set a weight factor h(k,i) indicating each time the surface amount of the considered kth first picture segment contributes to the further ith second picture segment; applying to each of the first pixel values x(j), a first transfer function component (T), wherein said first transfer function component is not a γ
correction function component;determining each ith second pixel value y(i) by summing the k first pixel values x(j) of the considered set weighed with the assigned weight factor h(k,i); applying to each of said second pixel values y(i), a second transfer function component (T'"'"'). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- ) pixels into a second picture composed of L pixels (Lε
-
21. A device for converting a first picture composed of M(Mε
- ) pixels into a second picture composed of L pixels (Lε
, M≠
L), wherein the first and second picture have corresponding content and wherein the pixels of said second picture are arranged according to a pixel sequence, said device comprising;an input for receiving, for each first picture to be converted, a first series of M first pixel values x(j) (0≦
j≦
M-1);dividing means for dividing a first picture surface covered by said first picture into M first picture segments and for dividing a second picture surface covered by said second picture into L second picture segments; multiplying means for forming each time a further ith second picture segment by multiplying each ith (0≦
i≦
L-1) second picture segment with a sharpness factor (W);mapping means for mapping each further ith second picture segment onto said first picture surface while maintaining the pixel sequence of the second picture in order to form, for each mapped further ith second picture segment, a further first picture segment within said first picture, the further first picture segments being non overlapping; identifying means for identifying, within each further first picture segment, first picture segments belonging to the considered further first picture segment in order to form, for each first picture segment, a set of k first picture segments including the identified first picture segments for the considered further first picture segments; assigning means for assigning, to each of the k first picture segments of each set, a weight factor h (k,i) indicating each time the surface amount of the considered kth first picture segment contributes to the further ith second picture segment;
determining means for summing, for ith second pixel value y(i), the k first pixel values x(j) of the considered set weighed with their assigned weight factor h(k;
i); andtransfer function application means for applying, to each of said first pixel values x(j), a first transfer function (T), wherein said first transfer function component is not a γ
correction function component and for applying, to each of said second pixel values y(i), a second transfer function component (T'"'"'). - View Dependent Claims (22)
- ) pixels into a second picture composed of L pixels (Lε
Specification