From Tracker Software PDF SDK
The method clumps pixels into square blocks. The pixels in a given block will be the same color, and the colors of the blocks are based on the colors in the image.
HRESULT FilterMosaic([in] ULONG nXAmount, [in] ULONG nYAmount, [in] IXC_MosaicType nType);
- [in] Specifies the width of the every square block. Value must be in range from 1 to 200.
- [in] Specifies the height of the every square block. Value must be in range from 1 to 200.
- [in] Specifies the type of filtering which may be one of the following IXC_MosaicType.
Returns S_OK if operation was successful or error code in other cases.