ImageGear Professional for Linux
IG_IP_add_tilt
ImageGear Professional > API Reference Guide > Core Component API Reference > Core Component Functions Reference > Image Processing Functions > IG_IP_add_tilt

This function adds a specified plane to the input image to correct for a tilt in the image luminance.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_IP_add_tilt(
        HIGEAR hIGear, 
        const LPAT_RECT lpRect,
        AT_DOUBLE dSlopeX, 
        AT_DOUBLE dSlopeY
);

Arguments:

Name Type Description
hIGear HIGEAR HIGEAR handle of image to be processed.
lpRect const LPAT_RECT Far pointer to an AT_RECT structure specifying the rectangular portion of the image on which to operate. If NULL, this operation will be performed on the entire image. Before ImageGear performs this operation it will check to see if an internal flag has been set to TRUE to make a mask active for this HIGEAR image. If a mask is active, and a valid pointer to a mask can be found, ImageGear will override the settings passed to this structure in favor of the non-rectangular ROI defined by the mask.
dSlopeX AT_DOUBLE Specify the slope of the plane in X direction, and must be given in units per pixel.
dSlopeY AT_DOUBLE Specify the slope of the plane in X direction, and must be given in units per pixel.

Return Value:

Returns the number of ImageGear errors that occurred during this function call.

Supported Raster Image Formats:

Grayscale - 8, 16, 32 bpp.

Example:

 
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HIGEAR   hIGear;         /* HIGEAR handle of image */
AT_RECT lpRect;         /* rectangle to process */
AT_DOUBLE dSlopeX, dSlopeY;
...
IG_IP_add_tilt( hIGear, lpRect, dSlopeX, dSlopeY);
...

Remarks:

The plane has X and Y zero crossing at the center of the input image with dSlopeX and dSlopeY as specified in the arguments.

This function, like other ImageGear Image Processing and Clipboard API calls, takes an AT_RECT structure as an argument, so that you can process a rectangular sub-region of an image. However, before ImageGear performs the operation specified by this function, it will check to see if an internal flag has been set to TRUE, indicating that a mask HIGEAR should be used with the image. If the flag is set to TRUE, and a valid pointer to a mask image has been assigned, ImageGear will override the settings passed to the AT_RECT structure and use the non-rectangular ROI defined by the mask HIGEAR. To create a non-rectangular region of interest, call IG_IP_NR_ROI_to_HIGEAR_mask().

Please see the descriptions of IG_IP_NR_ROI_mask_associate() and IG_IP_NR_ROI_to_HIGEAR_mask() functions for more details.

 

 

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