CV_8U
| const CV_8U = 0; | 
is unsigned 8bit/pixel - ie a pixel can have values 0-255, this is the normal range for most image and video formats.
CV_8S
| const CV_8S = 1; | 
CV_16U
| const CV_16U = 2; | 
CV_16S
| const CV_16S = 3; | 
CV_32S
| const CV_32S = 4; | 
CV_32F
| const CV_32F = 5; | 
CV_64F
| const CV_64F = 6; | 
CV_USRTYPE1
| const CV_USRTYPE1 = 7; | 
CV_8UC1
| const CV_8UC1; | 
CV_8UC2
| const CV_8UC2; | 
CV_8UC3
| const CV_8UC3; | 
CV_8UC4
| const CV_8UC4; | 
CV_8SC1
| const CV_8SC1; | 
CV_8SC2
| const CV_8SC2; | 
CV_8SC3
| const CV_8SC3; | 
CV_8SC4
| const CV_8SC4; | 
CV_16UC1
| const CV_16UC1; | 
CV_16UC2
| const CV_16UC2; | 
CV_16UC3
| const CV_16UC3; | 
CV_16UC4
| const CV_16UC4; | 
CV_16SC1
| const CV_16SC1; | 
CV_16SC2
| const CV_16SC2; | 
CV_16SC3
| const CV_16SC3; | 
CV_16SC4
| const CV_16SC4; | 
CV_32SC1
| const CV_32SC1; | 
CV_32SC2
| const CV_32SC2; | 
CV_32SC3
| const CV_32SC3; | 
CV_32SC4
| const CV_32SC4; | 
CV_32FC1
| const CV_32FC1; | 
CV_32FC2
| const CV_32FC2; | 
CV_32FC3
| const CV_32FC3; | 
CV_32FC4
| const CV_32FC4; | 
CV_64FC1
| const CV_64FC1; | 
CV_64FC2
| const CV_64FC2; | 
CV_64FC3
| const CV_64FC3; | 
CV_64FC4
| const CV_64FC4; |