lib/ccv_transform.c

ccv_decimal_slice

void ccv_decimal_slice(ccv_dense_matrix_t* a, ccv_dense_matrix_t** b, int type, float y, float x, int rows, int cols)

Similar to ccv_slice, it will slice a given matrix into required rows / cols, but it will interpolate the value with bilinear filter if x and y is non-integer.

• a : the given matrix that will be sliced
• b : the output matrix
• type : the type of output matrix
• y : the top point to slice
• x : the left point to slice
• rows : the number of rows for destination matrix
• cols : the number of cols for destination matrix

ccv_perspective_transform_apply

ccv_decimal_point_t ccv_perspective_transform_apply(ccv_decimal_point_t point, ccv_size_t size, float m00, float m01, float m02, float m10, float m11, float m12, float m20, float m21, float m22)

Apply a 3D transform against the given point in a given image size, assuming field of view is 60 (in degree).

• point : the point to be transformed in decimal
• size : the image size
• m00, m01, m02, m10, m11, m12, m20, m21, m22 : the transformation matrix

ccv_perspective_transform

void ccv_perspective_transform(ccv_dense_matrix_t* a, ccv_dense_matrix_t** b, int type, float m00, float m01, float m02, float m10, float m11, float m12, float m20, float m21, float m22)

Appy a 3D transform on a given matrix, assuming field of view is 60 (in degree).

• a : the given matrix to be transformed
• b : the output matrix
• type : the type of output matrix
• m00, m01, m02, m10, m11, m12, m20, m21, m22 : the transformation matrix

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