Method, an apparatus and a computer program product for image and video processing

Abstract

The embodiments relate to method for encoding and decoding. The method for decoding comprises receiving an input bitstream; determining a first distribution function having an input range with a minimum limit value and a maximum limit value; determining a second distribution function having an input range with a minimum limit value and a maximum limit value; decoding a value from the bitstream using a first distribution function; determining when the value equals with the OOR-value of the first distribution function; whereupon the method further comprises defining a positive value variable to be the maximum value of the input range of the first distribution function; defining a negative value variable to be the minimum value of the input range of the first distribution function; decoding the value from the bitstream using the second distribution function, whereupon the method further comprises determining when the decoded value is the OOR value of the second distribution function, in which case the positive value variable is updated with the maximum limit value of the second distribution function; and the negative value variable is updated with the minimum limit value of the second distribution function; a value is decoded from the bitstream using the second distribution function; determining when the decoded value is different from the OOR value and is greater or equal to zero, whereupon the positive value variable is updated with the decoded value; and determining when the decoded value is different from the OOR value and smaller than zero, whereupon the negative value variable is updated with the decoded value; creating a representable media according to the positive and/or negative value variables.