1. A method of operating an image processor suitable to convert an input image to stimulation data to be provided to a subject through a visual stimulator adapted to be implanted, the image processor performing the steps, comprising: extracting only an intensity stream from the input image; developing feature maps based on the intensity stream only; detecting a plurality of most salient regions of the input image based on the feature maps; selecting one salient region of the most salient regions as a highest saliency region; producing an output image based on the input image and the highest saliency region by highlighting the highest saliency region in the output image; selecting a field of view from the output image; downsampling the field of view to derive the stimulation data; and providing the stimulation data to the visual stimulator.