Image information transmission system transmitting maximum and minimum

Abstract

An image information transmission system that transmits image information, one frame of which is constituted by a plurality of image data. The plurality of pixel data corresponding to the one-frame image information is divided into a plurality of pixel blocks using a predetermined number of pixel data as a unit pixel block. Maximum and minimum values of pixel data within each pixel block are detected in units of divided pixel blocks. Maximum value data representing the detected maximum value and minimum value data representing a detected minimum value are output. One of the different quantization characteristics is selected in accordance with a difference between the maximum and minimum values of each pixel blocks output as described above. A level region between the maximum and minimum values is quantized to obtain a plurality of regions on the basis of the selected quantization characteristic. Position data representing one of the plurality of regions to which the pixel data within the pixel block belongs is output. The maximum and minimum value data output in units of pixel blocks and the position data output in correspondence with the pixel data within each pixel block are transmitted as described above, and therefore, a high-quality image information signal can be transmitted regardless of the characteristics of images.