数字图像处理（1）-图片信息获取和RGB-HSI

数字图像处理 信息获取

struct Rgb

{

unsigned char    b;

unsigned char    g;

unsigned char    r;

};

lpSrc=(unsigned char*)pDoc->m_pDib->m_lpImage +

lLineBytes*(lHeight - 1 -point.y) + point.x*3;

Rgb rgb;

rgb.b=*lpSrc;

rgb.g=*(lpSrc+1);

rgb.r=*(lpSrc+2);

亮度

int gray=(int)(0.114*rgb.r+0.587*rgb.g+0.299*rgb.b)

RGB到HSI图片信息采集

编码如下

R = ((double) pRgb->r) / 255.0;

G = ((double) pRgb->g) / 255.0;

B = ((double) pRgb->b) / 255.0;

Sum = R + G + B;

pHsi->Intensity = Sum / 3.0;

MinValue = (R < G) ? R : G;

MinValue = (B < MinValue) ? B : MinValue;

MaxValue = (R > G) ? R : G;

MaxValue = (B > MaxValue) ? B : MaxValue;

if(pHsi->Intensity < 0.00001)

pHsi->Saturation = ZERO_SATURATION;

else

pHsi->Saturation = 1.0 - (3.0 * MinValue) / Sum;

if(MinValue == MaxValue){

pHsi->Hue = UNDEFINED_HUE;

pHsi->Saturation = ZERO_SATURATION;

return;

}

TempDouble1 = (((R - G) + (R - B)) / 2.0);

TempDouble2 = (R - G) * (R - G) + (R - B) * (G - B);

Quotient = (TempDouble1 / sqrt(TempDouble2));

Radians = acos(Quotient);

Angle = Radians * DEGREES_PER_RADIAN;

pHsi->Hue =（B>G）？ 360.0 – Angle ： Angle;