如何实现整型图象到读点图象的转换

cvuser

打开一幅图象时，如何知道这幅图象是浮点型还是整型？能将这些类型进行转换吗？如何实现？  请各位牛人指导。。。。。

bebekifis

LoadImage后看看图像的深度不就知道啦。

cvuser

谢谢，知道了。。。。

szlgg628

但怎么转换呢？是不是写个for循环逐个地将在整型像素矩阵中的值赋予浮点型的像素矩阵？还是另外有其它的转换函数？

zixu1986

ConvertScale
Converts one array to another with optional linear transformation
void cvConvertScale( const CvArr* src, CvArr* dst, double scale=1, double shift=0 );

#define cvCvtScale cvConvertScale
#define cvScale  cvConvertScale
#define cvConvert( src, dst )  cvConvertScale( (src), (dst), 1, 0 )
src
Source array.
dst
Destination array.
scale
Scale factor.
shift
Value added to the scaled source array elements.


In case of scale=1, shift=0 no prescaling is done. This is a specially optimized case and it has the appropriate cvConvert synonym. If source and destination array types have equal types, this is also a special case that can be used to scale and shift a matrix or an image and that fits to cvScale synonym.


这是OpenCV的documentation 当scale = 1， shift = 0时， 等效于转换


待转换的类型由其头的类型决定

举例
IplImage* img = cvLoadImage(filename, CV_LOAD_IMAGE_ANYCOLOR);
IplImage* floatImage = cvCreateImage(cvSize(img->width, img->height), IPL_DEPTH_32F, 3);
cvConvertScale(img, floatImage);

szlgg628

学习了，谢谢！