java - 想要将 DataBufferUShort 转换为 DataBufferInt

Question

我有一个 BufferedImage.TYPE_USHORT_GRAY (DataBufferUShort) 类型的 BufferedImage，我想将其转换为 BufferedImage.TYPE_INT_RGB (DataBufferInt) 类型的 BufferedImage。有什么建议我如何实现它吗？

Answer 1

如果您只想提取最小值/最大值/平均值，则无需转换 BufferedImage:

// Assuming image is always TYPE_USHORT_GRAY
short[] values = ((DataBufferUShort) image.getRaster().getDataBuffer()).getData();

int min = Integer.MAX_VALUE;
int max = Integer.MIN_VALUE;
double mean;

for (int i = 0; i < values.length; i++) {
    int unsignedValue = values[i] & 0xFFFF;

    if (unsignedValue < min) {
        min = unsignedValue;
    }
    if (unsignedValue > max) {
        max = unsignedValue;
    }
    // ...etc. for mean and other values you like to extract. :-)
}

如果您想将图像转换为TYPE_INT_RGB以用于显示目的(而不关心精度)，您只需创建所需类型的新图像并在其上绘制原始图像即可:

BufferedImage display = new BufferedImage(original.getWidth(), original.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = display.createGraphics();
try {
    g.drawImage(original, 0, 0, null);
}
finally {
    g.dispose();
}