DD::Image::Filter::Coefficients Struct Reference

Public Member Functions

float apply (const float *array) const
float apply (const float *array, int left, int right) const

Public Attributes

const float * array
int delta
 distance between cefficients in array
int count
 number of coefficients
int first
 index to multiply by array[0]
float normalize
 common multiplier to make it sum to 1

Detailed Description

Coefficients for the filter at a particular position & width.

Member Function Documentation

float Filter::Coefficients::apply ( const float *  array) const

Multiply an array of pixels by the filter coefficients and return the sum of the results. It is equivalent to the following code:

float sum = pixels[first]*array[0];
for (int i = 1; i < count; i++) sum += pixels[first+i]*array[delta*i];
return sum*normalize;

Note that in many cases your input is a bounded array or is not an array at all. You can either write equivalent code to read your source, or copy it to an array and call this.

References array, count, delta, first, and normalize.

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