Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
Apparatus for generating a two-dimensional coloured display in which there is a variation of colour across the display in a predetermined manner, the colour of each pixel in the display being defined by at least one colour components, the apparatus comprising, for each colour component, a memory for storing a pair of gradation curves (X(i), Y(i)) representing the variation in intensity of said colour component in orthogonal directions X, Y across said display; processing means for determining a resultant colour component value V(i,j) for a pixel to be displayed at a location (i,j) in said display in accordance with the following formula: V(i,j)=f[a(X(i)b(Y(j))+c(X(i)d(Y(j))] where the pixel has coordinates i,j and k is a normalizing constant, and where a, c, are functions of X(i), b, d are functions of Y(j) and f is an output function, said functions being chosen such that V(i,j) exhibits no discontinuities for all values of X(i), Y(j); and display means, responsive to said resultant colour component values V(i,j) for displaying a corresponding colour at a position in said display corresponding to that pixel.
Claim 2
Dependent Claim
177 words
Apparatus for generating a two-dimensional coloured display in which there is a variation of colour across the display in a predetermined manner, the colour of each pixel in the display being defined by at least one colour components, the apparatus comprising, for each colour component, a memory for storing a pair of gradation curves (X(i), Y(i)) representing the variation in intensity of said colour component in orthogonal directions X, Y across said display; processing means for determining a resultant colour component value V(i,j) for a pixel to be displayed at a location (i,j) in said display in accordance with the following formula: V(i,j)=f[a(X(i)b(Y(j))+c(X(i)d(Y(j))] where the pixel has coordinates i,j and k is a normalizing constant, and where a, c, are functions of X(i), b, d are functions of Y(j) and f is an output function, said functions being chosen such that V(i,j) exhibits no discontinuities for all values of X(i), Y(j); and display means, responsive to said resultant colour component values V(i,j) for displaying a corresponding colour at a position in said display corresponding to that pixel.
Claim 3
Dependent Claim
14 words
Apparatus according to claim, 1, wherein said formula is chosen from: V(i,j)=X(i)Y(j)/k and V(i,j)=[kX(i)+kY(j)-X(i)Y(j)]/k
Claim 4
Dependent Claim
14 words
Apparatus according to claim 1, wherein said processing means comprises a suitably programmed computer.
Claim 5
Dependent Claim
58 words
Apparatus according to claim 1, wherein said processing means comprises first, second, third and fourth look-up tables defining said respective functions a(Xi), b(Xi), c(Xi), and d(Xi); two multipliers to which outputs from said first and third look-up tables and said second and fourth look-up tables are fed respectively; and an adder for adding the outputs from said multipliers.
Claim 6
Dependent Claim
19 words
Apparatus according to claim 4, further comprising means for adding a random variation to the output from said adder.
Claim 7
Dependent Claim
16 words
Apparatus according to claim 4, further comprising a normaliser for normalising the output from said adder.
Claim 8
Dependent Claim
16 words
Apparatus according to claim 5, further comprising a normaliser for normalising the output from said adder.