An imaging device is capable of on-chip processing data output by a series of pixels 1, 2, 16. The pixels 1, 2, 16 are arranged into a series of super pixels or tiles that together form a large area array. The pixels 1, 2, 16 are arranged into two groups, nominally group A (odd pixels) and group B (even pixels). Data from the individual pixels 1, 2, 16 is read out according to the relative position of the pixel within each group. The technique employed by the device allows the array data rate to be controlled dynamically by the super pixel information content. The output data bandwidth is increased at the expense of image spatial resolution where scene content contains large uniform areas (e.g. desert, sea, sky) that would otherwise generate huge amounts of similar data that carries little additional information.