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Update BufferedImageLuminanceSource.java

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This commit is contained in:
wood 2015-10-02 00:25:39 +08:00
parent a2159ed0f4
commit 249d043f91
1 changed files with 6 additions and 4 deletions
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10
javase/src/main/java/com/google/zxing/client/j2se/BufferedImageLuminanceSource.java
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@ -69,13 +69,15 @@ public final class BufferedImageLuminanceSource extends LuminanceSource {
if ((pixel & 0xFF000000) == 0) {
pixel = 0xFFFFFFFF; // = white
}
// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC)
// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
// (306*R) >> 10 is approximately equal to R*0.299, and so on.
// 0x200 >> 10 is 0.5, it implements rounding.
buffer[x] =
(306 * ((pixel >> 16) & 0xFF) +
601 * ((pixel >> 8) & 0xFF) +
117 * (pixel & 0xFF)
) >> 10;
117 * (pixel & 0xFF) +
0x200) >> 10;
}
raster.setPixels(left, y, width, 1, buffer);
}