DicomObjects.NET8 Documentation
DicomObjects.Enums Namespace / FilterMode Enumeration



In This Topic
    FilterMode Enumeration
    In This Topic
    Enumerated values for filter mode
    Syntax
    'Declaration
     
    
    Public Enum FilterMode 
       Inherits System.Enum
    'Usage
     
    
    Dim instance As FilterMode
    public enum FilterMode : System.Enum 
    public enum class FilterMode : public System.Enum 
    Members
    MemberDescription
    BiLinear This mode is most applicable when zoom is >1, and uses bilinear interpolation. This is a simple and relatively fast means of magnification.
    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"
    BSpline2 Custom format
    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 fro –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.
    Default For MagnificationMode, this acts identically to doFilterReplicate and for MinificationMode it acts as doFilterMovingAverage. 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".
    Gpu This mode uses interpolation in the GPU to apply magnification or minification. It does not give as much flexibility as the other modes, but may be significant faster, whilst still avoiding a "blocky" effect for magnification and avoiding aliasing on grid-lines for minification.
    MovingAverage This mode is most applicable when zoom is <1, and calculates pixel values as a weighted average of the surrounding values. The number of values used for this calculation depends on the value of FilterLength. If this is 0 (the default), then a suitable values is determined internally, based on the zoom (approximately 2/ActualZoom), but if FilterLength is non-zero then 2*FilterLength values are used.
    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.
    Inheritance Hierarchy

    System.Object
       System.ValueType
          System.Enum
             DicomObjects.Enums.FilterMode

    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