Method wrappers

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Method wrappers#

HTTomo uses processing methods from external backend libraries. Because these methods accept different inputs and produce different outputs, HTTomo uses wrappers to provide a consistent interface between the pipeline steps and each method action.

Wrappers prepare method inputs, handle CPU/GPU data transfers, invoke the backend method and manage its outputs. Supporting information from Integrating methods with httomo-backends describes requirements such as the data pattern, implementation, memory usage and padding.

HTTomo wrapper layer and its five main wrapper types

Fig. 23 The HTTomo wrapper layer connects backend methods to the processing pipeline and handles their method-specific inputs and outputs.#

Wrapper types#

HTTomo provides five main wrapper types:

  • Generic: passes data to standard processing methods and returns the result.

  • Normalisation: supplies projection data, flats and darks, then returns normalised data.

  • Centering: prepares the required projections or sinograms and produces a centre-of-rotation value.

  • Reconstruction: supplies the data, projection angles and reconstruction parameters, including the centre of rotation.

  • Image saver: transfers data to the CPU when necessary and writes images to storage without changing the pipeline data.

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