DicomObjects.NET8 Documentation
DicomObjects Namespace / DicomImage Class / MagnificationMode Property



In This Topic
    MagnificationMode Property
    In This Topic
    Controls how pixels are interpolated when the image is magnified
    Syntax
    'Declaration
 

    Public Property MagnificationMode As FilterMode
    'Usage
 

    Dim instance As DicomImage
Dim value As FilterMode
 
instance.MagnificationMode = value
 
value = instance.MagnificationMode
    public FilterMode MagnificationMode {get; set;}
    public:
property FilterMode MagnificationMode {
   FilterMode get();
   void set (    FilterMode value);
}
    Remarks
    This property controls how DicomObjects handles magnification of images, either for display or other uses such as PrinterImage. The FilterMode enumerations (used for MagnificationMode and MinificationMode) are:
    • Default: For MagnificationMode, this acts identically to Replicate. This behaviour is the default, and is designed to minimise regulatory issues by doing the minimum necessary to display all pixel data, without adding extra "image processing".
    • Replicate: If zooming up is necessary, then pixels are simply replicated, giving a possibly "blocky" but honest representation of the pixel data. For minification, rows and columns are simply omitted as necessary.
    • BSpline: This smoothing procedure interpolates using a Cubic B-Spline, which has the advantage of guaranteeing continuity in both the first and second differentials of the image, in both directions. No other parameters are used in this smoothing method, which produces good visual results, though some users find them a little too "smoothed".
    • CubicSpline: This is similar to the B-Spline described above, but uses an additional parameter (CubicSplineAlpha) to control the degree of smoothing or edge enhancement. The default value is "�0.75", and normal values range from "�0.5" to "�1.25", though higher negative values may be used to produce deliberate edge enhancement, though generally, UnsharpLength and UnsharpEnhancement should be used for this purpose, as they are independent of the smoothing method.
    • MovingAverage: This mode is most applicable when zoom is less than 1, and calculates pixels values as a weighted average of the surrounding values. The number of values used for this calculation depends on the value of FilterLength. If FilterLength is 0 (the default), then a suitable value is determined internally, based on the zoom (approximately 2/ActualZoom), but if FilterLength is non-zero then 2*FilterLength values are used.
    • GDI (Graphical Device Intergace): This mode uses the interinsic capabilities of modern display hardware and software to leave the interpolation of the image to such systems. In practice, it is generally similar on most systems to a DicomObjects.Enums.FilterMode.BSpline, and should, particularly for large format display be the most efficient. However, experience shows that some graphic cards perform quite badly in this mode, especially in 64 bit mode, so practical testing is advised.
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also

    Reference

    DicomImage Class
    DicomImage Members

    Send Feedback