An image processing system, which operates on an input image data stream consisting of successive multi-level values, effecting a plurality of respectively different types of image data processing in accordance with a plurality of different categories of the input image data, utilizes a neural network to assign each datum to a specific category, with resultant output signals from the neural network being used to select the appropriate type of image data processing for that datum.
Image processing system utilizing neural network for discrimination between text data and other image data