An angle-sensitive pixel device that uses the Talbot effect to detect the local intensity and incident angle of light includes two local diffraction gratings stacked above a photodiode. A response that the connection has been upgraded to the WebSocket connection is provided. The biocompatible microspheres can include first and second sets of microspheres. The inlet section, vortex generator and the at least one flame accelerator may be operative to initiate a deflagration to detonation transition. For two neighboring pixels at positions which are point symmetrical with respect to the pixel of interest, the comparison unit sets that only one of the two neighboring pixels has the predetermined positional relationship.