Method and device for intra-predictive encoding/decoding a coding unit comprising picture data, said intra-predictive encoding depending on a prediction tree and a transform tree

A method comprising:

• building a prediction tree from data indicating a non-square partition type from a received signal;
• obtaining sizes of leaves of a transform tree from the received signal;
• building a transform tree according to the sizes of the leaves of the transform tree and according to the non-square partition type of the prediction tree, such that all of a first plurality of leaves of the transform tree which are embedded in a first unit of the prediction tree are scanned before starting to scan a next plurality of leaves of the transform tree which are embedded in a next unit of the prediction tree, such that a transform tree scanning order is based on spatial partitioning of the prediction tree.

A device comprising a processor configured to:

• build a prediction tree from data indicating a non-square partition type from a received signal;
• obtain sizes of leaves of a transform tree from the received signal;
• build a transform tree according to the sizes of the leaves of the transform tree, and according to the non-square partition type of the prediction tree, such that all of a first plurality of leaves of the transform tree which are embedded in a first unit of the prediction tree are scanned before starting to scan a next plurality of leaves of the transform tree which are embedded in a next unit of the prediction tree, such that a transform tree scanning order is based on spatial partitioning of the prediction tree.