ComputeHistogram  Method

Description         Compute the histogram on a 256x256 window (further on: AOI, area of interest) of the (8 bits/pixel) input grayscale device independent bitmap due to the special way of computing, it is very fast to actualize the histogram after changing a little bit the position of area of interest (AOI).

Syntax                 lRet = [BIFilter.]ComputeHistogram hDib Mode hHist LeftTopCornerX LeftTopCornerY Error

Remarks             lRet                         LONGLONG Handle of the newly created DIB on success or 0 on failure.

                            hDib                       LONGLONG Handle to a device independent bitmap.

                            Mode                      Long                Create, destroy or compute histogram.

                                                                                    OPEN - Create the LUT (30).

                                                                                    COMPUTE - Compute the actual LUT (31)

                                                                                    CLOSE - Destroy the LUT

                            hHist                       LONGLONG Handle to a histogram.(256 unsigned byte).

                            LeftTopCornerX  Long                X Coordinate of the left-top corner of 256x256 area of interest.

                            LeftTopCornerY  Long                Y Coordinate of the left-top corner of 256x256 area of interest.

                            Error                      short*              Error code.

See Also