SWITCHING BETWEEN DISCRETE COSINE TRANSFORM COEFFICIENT CODING MODES Russian patent published in 2013 - IPC H03M7/46 H03M7/48 G06T9/00 

FIELD: radio engineering, communication.

SUBSTANCE: method of encoding transform coefficients includes: encoding the position and value of a last non-zero coefficient of a block; encoding at least one coefficient in accordance with a first coding mode if the amplitude of said at least one coefficient is less than or equal to a threshold; and determining a cumulative sum of amplitudes of previously coded non-zero coefficients that are greater than the threshold; and if the cumulative sum is less than a cumulative threshold value, and the position of the last non-zero coefficient is less than a location threshold: coding a subsequent coefficient in accordance with the first coding mode; otherwise, coding a subsequent coefficient in accordance with a second coding mode.

EFFECT: high encoding efficiency.

22 cl, 8 dwg