opencv - OpenCV IplImage data to float

Question

Is there a way to convert IplImage pointer to float pointer? Basically converting the imagedata to float. Appreciate any help on this.

Answer 1

使用cvConvert(src,dst)wheresrc是源图像，dst是预分配的浮点图像。

例如

dst = cvCreateImage(cvSize(src->width,src->height),IPL_DEPTH_32F,1);
cvConvert(src,dst);

Answer 2

// Original image gets loaded as IPL_DEPTH_8U
IplImage* colored = cvLoadImage("coins.jpg", CV_LOAD_IMAGE_UNCHANGED);
if (!colored)
{   
    printf("cvLoadImage failed!\n");
    return; 
}   

// Allocate a new IPL_DEPTH_32F image with the same dimensions as the original
IplImage* img_32f = cvCreateImage(cvGetSize(colored), 
                                  IPL_DEPTH_32F, 
                                  colored->nChannels);
if (!img_32f)
{   
    printf("cvCreateImage failed!\n");
    return;
}   

cvConvertScale(colored, img_32f);

// quantization for 32bit. Without it, this img would not be displayed properly
cvScale(img_32f, img_32f, 1.0/255);

cvNamedWindow("test", CV_WINDOW_AUTOSIZE);
cvShowImage ("test", img_32f);

Answer 3

您无法通过简单地投射指针将图像转换为浮动。您需要遍历每个像素并计算新值。

请注意，大多数浮点图像类型假定范围为 0-1，因此您需要将每个像素除以您想要的最大值。