Digital Signal Processing Reference
In-Depth Information
C.14
Operationen auf
Bildfolgen (Stacks)
// class
AlphaBlendStack_
(continued)
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public void run(ImageProcessor bgIp) {
Programm C.3
Alpha Blending (Teil 2).
//
bgIp
= background image
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if(runDialog()) {
//open dialog box (returns
false
if cancelled)
int w = bgIp.getWidth();
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int h = bgIp.getHeight();
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// prepare foreground image
ImageProcessor fgIp =
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fgIm.getProcessor().convertToByte(false);
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ImageProcessor fgTmpIp = bgIp.duplicate();
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// create image stack
ImagePlus movie =
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NewImage.createByteImage("Movie",w,h,nFrames,0);
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ImageStack stack = movie.getStack();
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// loop over stack frames
for (int i=0; i<nFrames; i++) {
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// transparency of foreground image
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double iAlpha = 1.0 - (double)i/(nFrames-1);
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ImageProcessor iFrame = stack.getProcessor(i+1);
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// copy background image to frame
i
iFrame.insert(bgIp,0,0);
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iFrame.multiply(iAlpha);
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// copy foreground image and make transparent
fgTmpIp.insert(fgIp,0,0);
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fgTmpIp.multiply(1-iAlpha);
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// add foreground image frame
i
ByteBlitter blitter =
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new ByteBlitter((ByteProcessor)iFrame);
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blitter.copyBits(fgTmpIp,0,0,Blitter.ADD);
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}
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// display movie (image stack)
movie.show();
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}
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}
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}
// end of class
AlphaBlendStack_
