阴影补偿(shading compnsation)--去除图像中的光影

王朝other·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

图1 图2 光影

通过运算将光影从图1中去掉

实现步骤:

1.对图像2作平滑去噪声处理 。方法:周围25个像素去平均,得到SP2;

2.得到SP2中R、G、B各个分量的最大值得到MaxR,MaxG,MaxB;

3.对图1(P1)的每一个像素:

P1.r=P1.r/SP2.r*MaxR

P1.g=P1.g/SP2.g*MaxG

P1.b=P1.b/SP2.b*MaxB

代码片断:

class ClassLensComp{

private:

DataProcess * dpRGB;// = new DataProcess();

DataProcess * dpsMSK;

pixel Smooth(pixel *, size_t, size_t);

public:

//pixel GetV1(int, int);

ClassLensComp(DataProcess *, DataProcess *);

void LensComp(DataProcess* );

};

/////////////////////////////////////////////////////////////

其中DataProcess 是pixel结构的数组

struct pixel

{

double r;

double g;

double b;

}

/////////////////////////////////////////////////////////////

ClassLensComp::ClassLensComp(DataProcess* RGB_In, DataProcess* sMSK_In)

{

dpRGB=RGB_In;

dpsMSK=sMSK_In;

}

void ClassLensComp::LensComp(DataProcess* OutPut)

{

size_t i,j;

pixel *RGBBuf=dpRGB->get_rgbdata();

pixel *sMSKBuf=dpsMSK->get_rgbdata();

pixel *OutPutBuf=OutPut->get_rgbdata();

size_t W=dpRGB->get_rgb_width(); //the sMSK width is the same as the GRB's

size_t H=dpRGB->get_rgb_height(); //the sMSK height is the same as the GRB's

pixel MaxsMSK(0,0,0); //Save the max r,g,b

pixel* sMSKBuffer=new pixel[H*W];

//for(k=0;k<3;k++)

{

//smoothed sMSK;

for(i=0;i<H;i++)

for (j=0;j<W;j++)

{

//ignore the two circles pixels of the picture.

//if pixel is in this bound, copy from original

if ((i<=1) || (i>=H-2) || (j<=1) || (i>=W-2) )

sMSKBuffer[i*W+j]=sMSKBuf[i*W+j];

else

sMSKBuffer[i*W+j]=Smooth(sMSKBuf,i,j);

}// The sMSK has been smoothed first

//get MAXrgb

for(j=0;j<W*H;j++)

{

if (MaxsMSK.r<sMSKBuffer[j].r)

MaxsMSK.r =sMSKBuffer[j].r;

if (MaxsMSK.g<sMSKBuffer[j].g)

MaxsMSK.g =sMSKBuffer[j].g;

if (MaxsMSK.b<sMSKBuffer[j].b)

MaxsMSK.b =sMSKBuffer[j].b;

}

//

for(i=0;i<H;i++)

for (j=0;j<W;j++)

{

OutPutBuf[i*W+j].r =RGBBuf[i*W+j].r/sMSKBuffer[i*W+j].r * MaxsMSK.r ;

OutPutBuf[i*W+j].g =RGBBuf[i*W+j].g/sMSKBuffer[i*W+j].g * MaxsMSK.g ;

OutPutBuf[i*W+j].b =RGBBuf[i*W+j].b/sMSKBuffer[i*W+j].b * MaxsMSK.b ;

}

}

delete[] sMSKBuffer;

}

///////////////////////////////////////////////////////////////////////////////

pixel ClassLensComp::Smooth(pixel* RGBBuf, size_t x, size_t y)

{

size_t i,j;

size_t W=dpRGB->get_rgb_width(); //the sMSK width is the same as the GRB's

pixel sum=(0,0,0);

for(i=x-2;i<=x+2;i++)

for (j=y-2;j<=y+2;j++)

{

sum.r =sum.r +RGBBuf[i*W+j].r ;

sum.g =sum.g +RGBBuf[i*W+j].g ;

sum.b =sum.b +RGBBuf[i*W+j].b ;

}

sum.r=sum.r/25;

sum.g=sum.g/25;

sum.b=sum.b/25;

return sum;

}

///////////////////////////////////////////////////////////////////////////////

结果图片

结果图片有点过亮, 再校正一下即可

 
 
 
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