text: import LoadImageFunction from './LoadImageFunction'
  import BlurFunction from './BlurFunction'
  import BGR2GrayFunction from './BGR2GrayFunction'
  import CannyFunction from './CannyFunction'
  import ErodeFunction from './ErodeFunction'
  import DilateFunction from './DilateFunction'
  import SobelFunction from './SobelFunction'
  import GaussianBlurFunction from './GaussianBlurFunction'
  import ResizeFunction from './ResizeFunction'
  import ThresholdFunction from './ThresholdFunction'
  import OpeningFunction from './OpeningFunction'
  import ClosingFunction from './ClosingFunction'
  
  // function registry
  export default {
    LoadImageFunction,
    BlurFunction,
    GaussianBlurFunction,
    BGR2GrayFunction,
    CannyFunction,
    ErodeFunction,
    DilateFunction,
    SobelFunction,
    ResizeFunction,
    ThresholdFunction,
    OpeningFunction,
    ClosingFunction,
  }
  