Apparatus and method for assigning shrinkage factor during texture mapping operations
AssigneeSony Corporation
InventorHiroyuki Ozawa
Life of this patent
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Abstract
The present invention provides a picture processing apparatus and method comprising a displacement computing unit which computes displacements in a UV coordinate system of a 2-dimensional picture texture to be pasted on a multidimensional figure from displacements in a texture coordinate system of the figure and an XY coordinate system onto which the figure is mapped and supplies the computed displacements to a displacement adjusting unit for adjusting the displacements by multiplying them by adjustment coefficients to produce adjusted displacements which are then supplied to a shrinkage-factor computing unit for computing a shrinkage factor to be used as a shrinkage factor of MIPMAP filtering.
Claims8
A picture processing apparatus wherein a plurality of 2-dimensional pictures with shrinkage factors different from each other are stored in a memory, one of said 2-dimensional pictures is selected from said memory in accordance with contents of a multidimensional figure to be pasted on said multidimensional figure and said multidimensional figure with said selected 2-dimensional picture pasted thereon is mapped onto a first 2-dimensional coordinate system, said picture processing apparatus comprising:
- a displacement computing means for computing a plurality of displacements of said 2-dimensional picture on a second 2-dimensional coordinate system prescribing said 2-dimensional picture from multidimensional coordinates of a point inside a polygon constituting said multidimensional figure and a plurality of unit displacements of said point inside said polygon on said first 2-dimensional coordinate system onto which said polygon is mapped;
- a displacement adjusting means for adjusting said computed displacements of said 2-dimensional picture independently of each other by multiplying said computed displacements by coefficients to determine a plurality of adjusted displacements;
- and
- a shrinkage-factor computing means for computing a lod associated with a shrinkage factor of said 2-dimensional picture to be pasted on said multidimensional figure from said adjusted displacements of said 2-dimensional picture.
A picture processing method by which a plurality of 2-dimensional pictures with shrinkage factors different from each other are stored in a memory, one of said 2-dimensional pictures is selected from said memory in accordance with contents of a multidimensional figure to be pasted on said multidimensional figure and said multidimensional figure with said selected 2-dimensional picture pasted thereon is mapped onto a first 2-dimensional coordinate system, said picture processing method comprising the steps of:
- computing a plurality of displacements of said 2-dimensional picture on a second 2-dimensional coordinate system prescribing said 2-dimensional picture from multidimensional coordinates of a point inside a polygon constituting said multidimensional figure and a plurality of unit displacements of said point inside said polygon on said first 2-dimensional coordinate system onto which said polygon is mapped;
- adjusting said computed displacements of said 2-dimensional picture independently of each other by multiplying said computed displacements by coefficients to determine a plurality of adjusted displacements;
- and
- computing a lod associated with a shrinkage factor of said 2-dimensional picture to be pasted on said multidimensional figure from said adjusted displacements of said 2-dimensional picture.
Dependencies are inferred from the claim text.