Apparatus for table-driven conversion of pixels from YVU to RGB format

Claim 1

An apparatus for converting digital video pixels from YVU format to RGB format, comprising: (a) a first data register, a second data register, and a third data register; (b) computer memory coupled to said first, second and third data registers by a data bus, said computer memory having a plurality of tables stored therein, said computer memory further having a pixel stored therein in YVU format, said YVU pixel having separate Y, V, and U components; and (c) a controller coupled to said first, second and third data registers and to said computer memory by said data bus, wherein: said controller loads said first, second and third data registers with said Y, V, and U components, and said controller retrieves values from said plurality of stored tables and said controller generates values representing R, G, and B components of a digital video pixel corresponding to said Y, V, U pixel by accessing said stored tables using said Y, V and U components as indices; wherein said controller: (i) loads said Y component into said first data register; (ii) loads said V component into said second data register; (iii) looks-up in a first table the value of said loaded second data register to obtain a first result and loads the first result into said third data register; (iv) looks-up in a second table the sum of said loaded first data register and said loaded third data register to obtain a second result; (v) looks-up in a third table the value of said loaded second data register to obtain a third result and loads said third data register with the third result; (vi) reloads said second data register with said U component; (vii) looks-up in a fourth table the value of said reloaded second data register to obtain a fourth result and loads the sum of said fourth result and said third data register as loaded by said controller into said third data register; (viii) looks-up in a fifth table the sum of said loaded first data register and said third data register as loaded by said controller to obtain a fifth result; (ix) looks-up in a sixth table the value of said reloaded second data register to obtain a sixth result and loads the sixth result into said third data register; and (x) looks-up in a seventh table the sum of said loaded first data register and said third data register as loaded by said controller to obtain a seventh result; wherein the second, fifth and seventh results respectively represent R, G, and B components of a digital video pixel corresponding to said YVU pixel.

Claim 2

An apparatus for converting digital video pixels from YVU format to RGB format, comprising: (a) a first data register, a second data register, and a third data register; (b) computer memory coupled to said first, second and third data registers by a data bus, said computer memory having a plurality of tables stored therein, said computer memory further having a pixel stored therein in YVU format, said YVU pixel having separate Y, V, and U components; and (c) a controller coupled to said first, second and third data registers and to said computer memory by said data bus, wherein: said controller loads said first, second and third data registers with said Y, V, and U components, and said controller retrieves values from said plurality of stored tables and said controller generates values representing R, G, and B components of a digital video pixel corresponding to said Y, V, U pixel by accessing said stored tables using said Y, V and U components as indices; wherein said controller: (i) loads said Y component into said first data register; (ii) loads said V component into said second data register; (iii) looks-up in a first table the value of said loaded second data register to obtain a first result and loads the first result into said third data register; (iv) looks-up in a second table the sum of said loaded first data register and said loaded third data register to obtain a second result; (v) looks-up in a third table the value of said loaded second data register to obtain a third result and loads said third data register with the third result; (vi) reloads said second data register with said U component; (vii) looks-up in a fourth table the value of said reloaded second data register to obtain a fourth result and loads the sum of said fourth result and said third data register as loaded by said controller into said third data register; (viii) looks-up in a fifth table the sum of said loaded first data register and said third data register as loaded by said controller to obtain a fifth result; (ix) looks-up in a sixth table the value of said reloaded second data register to obtain a sixth result and loads the sixth result into said third data register; and (x) looks-up in a seventh table the sum of said loaded first data register and said third data register as loaded by said controller to obtain a seventh result; wherein the second, fifth and seventh results respectively represent R, G, and B components of a digital video pixel corresponding to said YVU pixel.