reference_downsample.md

downsample

Scales an image using given scaling factors for X and Y dimensions.

The nearest-neighbor method is applied. In ImageJ the method which is similar is called 'Interpolation method: none'.

Category: Transformations

Usage in ImageJ macro

Ext.CLIJ2_downsample(Image source, Image destination, Number factorX, Number factorY);

Usage in object oriented programming languages

Java

// init CLIJ and GPU
import net.haesleinhuepf.clij2.CLIJ2;
import net.haesleinhuepf.clij.clearcl.ClearCLBuffer;
CLIJ2 clij2 = CLIJ2.getInstance();
// get input parameters
ClearCLBuffer source = clij2.push(sourceImagePlus);
destination = clij2.create(source);
float factorX = 1.0;
float factorY = 2.0;

// Execute operation on GPU
clij2.downsample(source, destination, factorX, factorY);

// show result
destinationImagePlus = clij2.pull(destination);
destinationImagePlus.show();

// cleanup memory on GPU
clij2.release(source);
clij2.release(destination);

Matlab

% init CLIJ and GPU
clij2 = init_clatlab();
% get input parameters
source = clij2.pushMat(source_matrix);
destination = clij2.create(source);
factorX = 1.0;
factorY = 2.0;

% Execute operation on GPU
clij2.downsample(source, destination, factorX, factorY);

% show result
destination = clij2.pullMat(destination)

% cleanup memory on GPU
clij2.release(source);
clij2.release(destination);

Icy JavaScript

// init CLIJ and GPU
importClass(net.haesleinhuepf.clicy.CLICY);
importClass(Packages.icy.main.Icy);
clij2 = CLICY.getInstance();
// get input parameters
source_sequence = getSequence();
source = clij2.pushSequence(source_sequence);
destination = clij2.create(source);
factorX = 1.0;
factorY = 2.0;

// Execute operation on GPU
clij2.downsample(source, destination, factorX, factorY);

// show result
destination_sequence = clij2.pullSequence(destination)
Icy.addSequence(destination_sequence);
// cleanup memory on GPU
clij2.release(source);
clij2.release(destination);

Example scripts

workflow.ijm

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