VIDEO ENCODING METHOD AND DECODING METHOD, APPARATUSES THEREFOR, PROGRAMS THEREFOR, AND STORAGE MEDIA WHICH STORE THE PROGRAMS

摘要

An encoding method for an image signal by which the value of a pixel to be encoded is encoded by using a predicted value generated by space prediction or time prediction from a decoded image. The value of the pixel to be encoded is predicted to acquire the predicted value. The data of probability distribution on what value the value of an original pixel takes to the acquired predicted value is calculated by shifting the distribution data of the difference between the original pixel value in prediction encoding which is previously stored and the predicted value depending on the predicted value. The acquired probability distribution data is clipped to the range from the lower limit to the upper limit that the original pixel value can take. The value of the pixel to be encoded is encoded by using the probability distribution data from the lower limit to the upper limit of the clipped original pixel value.