a) Binary image (cropped to 761 × 761 pixels) obtained on Deneb in 1 ms exposure time with the Carlina photon-counting camera. The light that falls on the CCD comes from the intensifiers of circular shape. This image contains 3524 photons. b) Square modulus of the Fourier transform of the top left image (blue square of 245 × 245 pixels). In this part of the image, we detect the fringe peaks of the 5 m baseline (P1 mark). The intensities in the power spectrum are represented using a linear scale. The white arrow indicates the direction and the norm of the spatial frequency of the 5m baseline (oriented east-west) at 510 nm. Only two images among the Deneb data allow a direct detection of the fringes (in an individual frame without adding several power spectra). c) No fringes are detected in the power spectrum of the bottom right image, i.e., the fringes are located in the top left part of image a).
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