Method for securing a video system designed to send and display an image of a scene captured by a camera remotely, said video system comprising a device for capturing an image of said scene using said camera, a communication device for sending said image to a remote control station, a display device for displaying said image at said remote control station, said method being characterised by the following steps: - generation, using a first securing processor and for said image, of a marker encoded digitally in bits, said encoded marker including at least one item of information encoded in binary that is used to identify the camera (hereinafter referred to as the "identifier of the camera") that took said image and an item of information encoded in binary that is used to identify the date on which the image was taken by the camera (hereinafter referred to as the "time variable") in relation to a time reference, said first processor being designed to synchronise said time reference with a second processor, - insertion of said encoded marker into the image taken by the camera in order to create a secure image designed to be sent by the communication device of the video system to the display device, the insertion into said image being carried out by the addition, for each bit of said encoded marker, of a pattern to said image in the spatial domain, said pattern being characterised in that the conversion thereof into the spectral domain is a predefined submatrix of which at least one frequency coefficient encodes said bit of the encoded marker, - transmission of the secure image to the display device, - acquisition of said secure image by an acquisition device to enable extraction of the encoded marker by an extraction device, - extraction of said encoded marker of said secure image by comparison of the secure image with an unsecured image of said scene previously received, and transmission of the encoded marker to said second processor, - verification, by said second processor, of the time variable by comparison with said time reference and of the identifier of the camera in order to check the temporal freshness of the secure image and the origin thereof using the identifier, - flagging a failure of the video system if at least one of the items of information included in the encoded marker violates a predefined security criterion. - generation, using a first securing processor and for said image, of a marker encoded digitally in bits, said encoded marker including at least one item of information encoded in binary that is used to identify the camera (hereinafter referred to as the "identifier of the camera") that took said image and an item of information encoded in binary that is used to identify the date on which the image was taken by the camera (hereinafter referred to as the "time variable") in relation to a time reference, said first processor being designed to synchronise said time reference with a second processor, - insertion of said encoded marker into the image taken by the camera in order to create a secure image designed to be sent by the communication device of the video system to the display device, the insertion into said image being carried out by the addition, for each bit of said encoded marker, of a pattern to said image in the spatial domain, said pattern being characterised in that the conversion thereof into the spectral domain is a predefined submatrix of which at least one frequency coefficient encodes said bit of the encoded marker, - transmission of the secure image to the display device, - acquisition of said secure image by an acquisition device to enable extraction of the encoded marker by an extraction device, - extraction of said encoded marker of said secure image by comparison of the secure image with an unsecured image of said scene previously received, and transmission of the encoded marker to said second processor, - verification, by said second processor, of the time variable by comparison with said time reference and of the identifier of the camera in order to check the temporal freshness of the secure image and the origin thereof using the identifier, - flagging a failure of the video system if at least one of the items of information included in the encoded marker violates a predefined security criterion.