Patent ID: 8908902

Claim:
A verification device for verifying the integrity of a display means, the display means comprising an acquisition device, a main processor, a video controller and a display device controlled by a video controller, the video controller being connected to the display device by a dedicated connection, the acquisition device measuring an instantaneous value of a data, the main processor producing, from the instantaneous value, a series of graphic orders representative of the instantaneous value, the video controller including a microprocessor and a control means, the microprocessor receiving the series of graphic orders from the main processor and generating a bit-map, the control means processing the bit-map in order to generate a video signal in a predetermined format, the video signal being transmitted at the output of the controller, via the connection, towards the display device, the instantaneous value being displayed in a zone of an image displayed on the display device, the verification device including an input interface which allows the verification device to be connected at a branch of the connection between the video controller and the display device; the verification device comprising: a reconstruction device reconstructing a reconstructed image from the video signal applied to the input interface corresponding to the zone of the image displayed on the display device; an image analyzer extracting a reconstructed value of the data from the reconstructed image; and a comparison device comparing the reconstructed value of the data with a reference value of the item of data to be displayed, the reference value being the instantaneous value of the data measured using the acquisition device or the instantaneous value of the data measured using another acquisition device, wherein the reconstruction device processes the video signal in a manner which is the reverse of the encoding carried out by the control means with which the video controller is provided in order to control the display device.