Mat File type

A Mapping of Type to Numbers in OpenCV

        C1   	C2	C3	C4
CV_8U	0	8	16	24
CV_8S	1	9	17	25
CV_16U	2	10	18	26
CV_16S	3	11	19	27
CV_32S	4	12	20	28
CV_32F	5	13	21	29
CV_64F	6	14	22	30


Unsigned 8bits uchar 0~255
IplImage: IPL_DEPTH_8U
Mat: CV_8UC1, CV_8UC2, CV_8UC3, CV_8UC4

Signed 8bits char -128~127
IplImage: IPL_DEPTH_8S
Mat: CV_8SC1，CV_8SC2，CV_8SC3，CV_8SC4

Unsigned 16bits ushort 0~65535
IplImage: IPL_DEPTH_16U
Mat: CV_16UC1，CV_16UC2，CV_16UC3，CV_16UC4

Signed 16bits short -32768~32767
IplImage: IPL_DEPTH_16S
Mat: CV_16SC1，CV_16SC2，CV_16SC3，CV_16SC4

Signed 32bits int -2147483648~2147483647
IplImage: IPL_DEPTH_32S
Mat: CV_32SC1，CV_32SC2，CV_32SC3，CV_32SC4

Float 32bits float -1.18*10-38~3.40*10-38 
IplImage: IPL_DEPTH_32F
Mat: CV_32FC1，CV_32FC2，CV_32FC3，CV_32FC4

Double 64bits double 
Mat: CV_64FC1，CV_64FC2，CV_64FC3，CV_64FC4

Unsigned 1bit bool
IplImage: IPL_DEPTH_1U