e678. 尖锐化图像

This example demonstrates a 3x3 kernel that sharpens an image.

    Kernel kernel = new Kernel(3, 3,
        new float[] {
            -1, -1, -1,
            -1, 9, -1,
            -1, -1, -1});
    BufferedImageOp op = new ConvolveOp(kernel);
    bufferedImage = op.filter(bufferedImage, null);

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