Abstract: The present invention relates to a device for the data processing of linear images of generatrices of an article having an axis of revolution.The images being detected by a linear image detector having photosensitive points, the device has a memory (24) and a calculator (23) adapted to calculate, for each point of the linear image detector, data values of images coming from such point during a first processing period which corresponds to a complete revolution of the article and to store said average value in the memory (24).The device also has a memory (21) adapted to store all the image data coming from the linear image detector during the course of a complete revolution of the article and restore them during a second processing period after the first processing period.Finally, it comprises a threshold memory (26) which, for each point of the photosensitive detector, stores at least the threshold information.The invention applies to the inspection of bodies of revolution.