Abstract: An image processing apparatus includes a converter, a quantizer, a transfer speed recognizer, a transfer data converter and an interface. The converter reads an image of a subject to convert it into an electric signal before outputting it. The quantizer outputs a quantized electric signal as an image signal while quantizing the electric signal output from the converter. The transfer speed recognizer detects a transfer speed of the image signal output to an external part. The transfer data quantity converter converts a data quantity of the quantized image signal from the quantizer in accordance with the transfer speed detected by ther transfer speed recognizer. The interface outputs the image signal outputted from the transfer data quantity converter.

Abstract: An image processing device comprises an image reader section, an A/D converter section, a speed detection roller, an encoder, and an image information precision control section. The image reader section detects the intensity of one or more colors on a subject on which the image reader section moves, and outputs an electrical signal corresponding to the intensity. The A/D converter section quantizes the electric signal to a digital signal. The movement speed of the image reader section which is moving on the subject is detected by the speed detection roller and the encoder. The image information precision control section controls quantization precision of the digital signal according to the movement speed detected by the speed detection roller and the encoder.