Picture Coding for Digital Still Camera

Abstract

This paper describes a picture-coding technology for a digital still camera which records still images on a memory card The JPEG (Joint Photographic Experts Group) is working on standardizing the digital compression and coding of still images. It is desirable to apply this standard to the digital still camera However, the number of bits to record a fixed number of images on a memory card is comparatively small We propose a method of controlling the bit rate by calculating the activity of images before coding The quantize matrix and the bit allocation for each coding block are determined by the image and the block activity As a result, the number of images recordable on a memory card is fixed and the coded data can be decoded with a standard JPEG decoder