Image compression apparatus and an image restoration apparatus

Image compression apparatus using a predictive coding scheme, per line in the compressed image, respectively perform prediction using a plurality of types of predictors of the same type of a plurality of predictors, according to the prediction error is smallest predictor based on the prediction error amount, determines one quantizer among the plurality of types of quantizers. Moreover, every predetermined pixel block of the 1 line, respectively performs prediction using the same kind of a plurality of predictors and the plural types of predictors, based on the type of the prediction error is smallest predictor, said plurality identifying one predictor of the type of predictor. Then, compressed data of a pixel block using a quantizer determined to identified predictor. Image restoration apparatus, by using the identified predictor and an inverse quantizer corresponding to the determined quantizer, restores the compressed image from the compressed image data.