/*!
*/
image max(const image& lhs,const image& rhs)
{
CvSize lhs_sz = lhs.dim();
CvSize rhs_sz = rhs.dim();
if((lhs_sz.height != rhs_sz.height) || (lhs_sz.width != rhs_sz.width)) throw exception();
image res = lhs;
cvMax(lhs,rhs,res);
return res;
}
/*!
*/
image operator /(const image& lhs,const image& rhs)
{
CvSize lhs_sz = lhs.dim();
CvSize rhs_sz = rhs.dim();
if((lhs_sz.width != rhs_sz.width) || (lhs_sz.height !=rhs_sz.height))
throw exception();
image result = lhs;
cvDiv(lhs,rhs,result);
return result;
}
/*!
*/
image operator*(const image& lhs,float val)
{
CvSize lhs_sz = lhs.dim();
image result(lhs_sz.height,lhs_sz.width);
cvScale(lhs,result,val);
return result;
}
/*!
*/
image operator-(const image& lhs,float val)
{
CvSize lhs_sz = lhs.dim();
image result(lhs_sz.height,lhs_sz.width);
cvSubS(lhs,cvRealScalar(val),result);
return result;
}
void imwrite(image& img,const char* file_name)
{
CvSize sz = img.dim();
IplImage* dst = cvCreateImage(sz,IPL_DEPTH_8U,1);
cvConvertScale(imscale(img),dst,255);
int ret = cvSaveImage(file_name,dst);
if(!ret) throw exception();
cvReleaseImage(&dst);
}
/*!
*/
image abs(const image& img)
{
CvSize sz = img.dim();
image res(sz.height,sz.width);
for(int i=0;i<sz.height;i++)
for(int j=0;j<sz.width;j++)
res[i][j] = fabs(img[i][j]);
return res;
}
/*!
*/
image sqrt(const image& img)
{
CvSize sz = img.dim();
image res = img;
for(int i=0;i<sz.height;i++)
for(int j=0;j<sz.width;j++)
res[i][j]=sqrt(img[i][j]+1e-14);
return res;
}
/*!
*/
void imdisplay(image& img,const char* title)
{
CvSize sz = img.dim();
IplImage* dst = cvCreateImage(sz,IPL_DEPTH_8U,1);
cvConvertScale(imscale(img),dst,255);
cvNamedWindow(title,CV_WINDOW_AUTOSIZE);
cvShowImage(title,dst);
cvWaitKey(1);
cvReleaseImage(&dst);
}
void img2buf(const image& img,double* buf,int col_aligned=1)
{
CvSize sz = img.dim();
for(int i=0;i<sz.height;i++)
{
for(int j=0;j<sz.width;j++)
if(col_aligned)
buf[j*sz.height+i] = img[i][j];
else
buf[i*sz.width+j] = img[i][j];
}
}
/*!
*/
image imscale(image& img)
{
CvPoint min_pos;
CvPoint max_pos;
float min_val = 1e10;
float max_val = -1e10;
image result = img;
/*get max and min*/
CvSize sz = img.dim();
for(int i=0;i<sz.height;i++)
for(int j=0;j<sz.width;j++)
{
float pxval=img[i][j];
if(pxval > max_val) max_val = pxval;
if(pxval < min_val) min_val = pxval;
}
float scale = 1.0/(max_val-min_val+1e-10);
cvConvertScale(img,result,scale,-min_val*scale);
return result;
}