Public Member Functions | |
void | _validate (bool) |
void | _request (int x, int y, int r, int t, ChannelMask, int count) |
void | engine (int y, int x, int r, ChannelMask, Row &) |
HConvolve (Node *node) | |
int | size () const |
float * | vector () const |
void | vector (int s, float *v) |
const char * | Class () const |
const char * | node_help () const |
This operator may be combined with VConvolve to produce the equivalent of a Convolve operator with a NxM rectangular matrix, as long as that matrix is the result of multiplying a 1xM matrix by a Nx1 matrix. The cache is best used if you put the HConvolve after the VConvolve.
Many useful low-pass filters can be represented this way, or approximated. This is thus used by the Blur operator. High-pass filters can also be approximated by subtracting the result of a low-pass filtering from the original picture, Sharpen uses this for that.
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