有色区域面积 [英] Area of colored region

问题描述

你好，

我的图像中有些区域是红色的.

我想计算所有这些区域的面积(或像素).

有人可以帮我吗?

Hello,

I have an image in which there is some regions are red.

I want to calculate area (or pixel) of total these regions.

Can anybody help me?

推荐答案

下面的代码会将图像转换为位图，并返回色相范围内的像素数.色相的值以度为单位，并且必须介于0.0到360.0之间.此方法支持使用比最大值更高的最小值，因此您可以将范围包裹在零度附近.您还必须在0到1.0之间指定可接受的饱和度值范围.

这样一来，您就可以选择模糊庄园中的所有像素，而不仅仅是一个RGB值.

The code below will convert an image to a bitmap and return the count of pixels that fall within a range of hues. The value of the hues are in degrees and must fall between 0.0 and 360.0. This method supports using a higher minimum value than maximum so you can wrap the range around zero degrees. You must also specify a range of acceptible saturation values between 0 and 1.0.

This allows you to select all pixels in a fuzzy manor instead of just one RGB value.

int GetPixelsForHueRange(Image image, float lowerHue, float upperHue, float minSaturation, float maxSaturation)
{
    Bitmap bmp = new Bitmap(image);
    //Handle wrap around
    if (lowerHue > upperHue)
    {
        return GetPixelsForHueRange(image, lowerHue, 360.0f, minSaturation, maxSaturation) +
            GetPixelsForHueRange(image, 0.0f, upperHue, minSaturation, maxSaturation);

    }
    int count = 0;
    for (int i = 0; i < bmp.Size.Width; i++)
    for (int j = 0; j < bmp.Size.Height; j++)
    {
        System.Drawing.Color c = bmp.GetPixel(i, j);

        float hue = c.GetHue();
        float sat = c.GetSaturation();
        if ((hue >= lowerHue && hue <= upperHue) && 
            (sat >=minSaturation && sat <= maxSaturation))
        {
            count++;
        }
    }
    return count;

}

用法:

Usage:

Image img = Image.FromFile(@"C:\Users\me\Pictures\rainbow.jpg");
//Check for "red" pixels
int pixelCount = GetPixelsForHueRange(img, 350.0f, 10.0f, 0.30f,1.0f);

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