Unidirectional transfer of data from sender to receiver

A sender device configured for unidirectional transfer of data to a receiver device, comprising:

• a data storage interface to a data storage;
• a display output to a display (142);
• a processor subsystem configured to:
• via the data storage interface, access the data to be transmitted to the receiver device;
• encode respective parts of the data to generate respective 2D barcodes;
• via the display output, sequentially display the 2D barcodes on the display.

A receiver device configured for receiving data from a sender device, wherein the sender device is configured to transmit the data by sequentially displaying 2D barcodes on a display, comprising:

• a sensor interface to an image sensor;
• a processor subsystem configured to:
• using the image sensor, capture the sequentially displayed 2D barcodes to obtain a series of captured images, and in each or a subset of the series of captured images:
• detect a position of a respective 2D barcode in the captured image;
• scan the 2D barcode at the identified position to obtain barcode data;
• decode the barcode data to, together with the barcode data obtained from other captured images, obtain a received version of the transmitted data.