[英]Variance for an image histogram in java
我正在尝试计算Java中图像的标准偏差。 我正在使用rast.Sample来获取每个灰度,然后将其从均值中去除并进行平方。
我的代码是:
public int standardDeviation(BufferedImage source)
{
int width = source.getWidth();
int height = source.getHeight();
int totalPixels = width * height;
int temp = 0;
int VarianceSum = 0;
double SumSquared = 0;
int mean = mean(source);
double variance = 0;
int StandardDeviation = 0;
Raster rast = source.getRaster();
//Loop through rast getting each grey level.
for(int i =0; i<width; i++)
{
for(int j=0; j<width; j++)
{
temp = rast.getSample(i,j,0);
VarianceSum += (temp - mean);
SumSquared = Math.pow(VarianceSum,2);
}
}
variance = SumSquared/totalPixels;
System.out.println(temp);
System.out.println(VarianceSum);
//System.out.println(SumSquared);
System.out.println(totalPixels);
return StandardDeviation;
}
我在做傻事! 请帮忙
您遍历宽度两次。 如果width!= height将崩溃。 另请参阅我的评论
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