According to one embodiment, a video transmission system includes a coding apparatus for compressing a plurality of input images and a decoding apparatus for extending the compressed images. The coding apparatus includes a predictive coding unit that generates predictive error data based on a reference image and an input image, a data compression unit that compresses the predictive error data, an image storage unit that stores the compressed input image in a frame memory in the compressed state or compresses a local decoded image and stores the compressed local decoded image in the frame memory, and an image extension unit that extends an image stored in the frame memory. The decoding apparatus includes a data extension unit that extends the predictive error data, and a predictive decoding unit that acquires the completely decoded input image as the reference image and newly decoding the input image based on the acquired reference image and the predictive error data.