Fig. 2

Ptychographic streaming pipeline: streaming pipeline implemented at the ALS for ptychographic imaging. The software structure follows the same logic as sketched in Fig. 1. Once a new scan has been triggered by the experimental control, a frame-grabber continuously receives raw data packets from the camera, assembles them to a frame and sends raw frames to the back-end. Incoming frames are processed by different (and independent) workers of the back-end and reduced data are sent back to the front-end and visualized in a graphical user interface (GUI). The pipeline includes a dark worker for dark correction, multiple frame workers for pre-processing and data reduction, an image worker for low-resolution image reconstruction and a SHARP worker for high-resolution ptychographic image reconstruction. A handler is coordinating the data and communication workflow in which different types of control and data plugs (sockets) are used. While most of the components communicate via the transmission control protocol (TCP), the raw data packets from the camera are sent via the user datagram protocol (UDP)