Perspective Projection
Description
Projects the input image to the output canvas using transformation matrix. Could be used to fix Perspective.
Params
| tSrc | Tensor | The source image. |
| tTransform | Tensor | Affine transformation matrix (3x3) but in in shape [3, 1, 4], where each 4th element is unused. Such shape is used for more effective access to matrix values in GPU. |
| shape | Array.<number> | Output shape |
| dType? | string | Output data type, default to input |
Example
// Manual affine transformation matrix
const tMatrix = new gm.Tensor('float32', [3, 1, 4], new Float32Array([
-1, 0.5, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
]));
gm.perspectiveProjection(tSrc, tMatrix, [1000, 1000, 4]);// 4 point perspective transform
const tMatrix = new gm.Tensor('float32', [3, 1, 4]);
gm.generateTransformMatrix(
new gm.Rect([10, 10, 100, 15, 100, 150, 15, 150]), // Rect on original image to be projected
[100, 100], // Output dimensions
tMatrix, // Tensor to be filled
);
gm.perspectiveProjection(tSrc, tMatrix, [100, 100, 4]);