Encoder, decoder and method for data

摘要

Encoding input data D1 provided in a first data format to produce encoded data E2. The encoding transforms 20 the input data from a first data format to a second data format and encodes the data from the second data format to create the encoded data. The encoded data includes information that indicates a transformation used to convert the data formats. Preferably, the input data is image or video data and the data formats are different colour spaces. The encoder may analyse the input data and select an appropriate transformation and target colour space to allow the encoding to be performed more efficiently. The encoder may generate residual information indicating distortions that arise during the data format conversion or transformation. The residual information ensures that the encoding can be losslessly decoded. Corresponding encoding method and apparatus are included.