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## 5.4.2 `VDMask` operations

The following operations are defined for `VDMask`:

    // Cast to VIMask and VImage
    operator VIMask();
    operator VImage();

    // Build gauss and log masks
    static VDMask gauss( double, double );
    static VDMask log( double, double );

    // Rotate
    VDMask rotate45();
    VDMask rotate90();

    // Scale to intmask
    VIMask scalei();

    // Transpose, invert, join and multiply
    VDMask trn();
    VDMask inv();
    VDMask cat( VDMask );
    VDMask mul( VDMask );