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• ObjectLightness : SoAutoThresholdingProcessing , SoTopHatProcessing , SoHExtremaWatershedProcessing
• OffsetMode : SoBinaryCorrelationProcessing2d , SoGrayscaleCorrelationProcessing2d
• OpenCLDeviceType : SoOpenCLDevice
• OpenMode : SoRasterImageRW , SbTVizData
• OperandRGBA : SoTextureCombiner
• Operation : SoBoolOperation
• OperationMode : SoIterativeMorphoLutProcessing2d , SoIterativeMorphoLutProcessing3d
• OperationType : SoCSGOperation
• Orientation : SoTextOrientationElement , SoTextProperty , SliceScaleBar , PoBar , PoCurveFilling , SoVectorizeAction
• Origin : SoArray
• OutputMode : SoMarkerBasedWatershedProcessing
• OutputSelection : SoEigenDecompositionProcessing2d , SoEigenDecompositionProcessing3d
• OutputType : SoGaussianBlurFilterProcessing
• OverMethod : SoVolumeData
• SoOpenCLError : SoOpenCL