/**
* General code for convolving a box filter across an image using the integral image.
*
* @param integral Integral image.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be declared and returned. Modified.
* @return Convolved image.
*/
public static <T extends ImageSingleBand> T convolve(
T integral, IntegralKernel kernel, T output) {
if (integral instanceof ImageFloat32) {
return (T) IntegralImageOps.convolve((ImageFloat32) integral, kernel, (ImageFloat32) output);
} else if (integral instanceof ImageSInt32) {
return (T) IntegralImageOps.convolve((ImageSInt32) integral, kernel, (ImageSInt32) output);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
/**
* Convolves a kernel around a single point in the integral image.
*
* @param integral Input integral image. Not modified.
* @param kernel Convolution kernel.
* @param x Pixel the convolution is performed at.
* @param y Pixel the convolution is performed at.
* @return Value of the convolution
*/
public static <T extends ImageSingleBand> double convolveSparse(
T integral, IntegralKernel kernel, int x, int y) {
if (integral instanceof ImageFloat32) {
return IntegralImageOps.convolveSparse((ImageFloat32) integral, kernel, x, y);
} else if (integral instanceof ImageSInt32) {
return IntegralImageOps.convolveSparse((ImageSInt32) integral, kernel, x, y);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static <I extends ImageSingleBand, T extends ImageSingleBand> T transform(
I input, T transformed) {
if (input instanceof ImageFloat32) {
return (T) IntegralImageOps.transform((ImageFloat32) input, (ImageFloat32) transformed);
} else if (input instanceof ImageUInt8) {
return (T) IntegralImageOps.transform((ImageUInt8) input, (ImageSInt32) transformed);
} else if (input instanceof ImageSInt32) {
return (T) IntegralImageOps.transform((ImageSInt32) input, (ImageSInt32) transformed);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
