Patent ID: 9319697
Filing Date: 2016-04-19
CPC Classification: H04N

Claim Text:
1. A computer-implemented method for decoding an image, the method comprising: obtaining a set of coefficients representing a residual block of the image, the set of coefficients including a plurality of non-zero coefficients; determining whether a count of modifiable coefficients in the set of coefficients is greater than a predetermined number, wherein modifiable coefficients in the set comprise a first non-zero coefficient according to a reverse scan order of the residual block, a last non-zero coefficient according to the reverse scan order, and the coefficients between the first and the last non-zero coefficients in the set of coefficients according to the reverse scan order; if the count of modifiable coefficients in the set of coefficients is less than or equal to the predetermined number, determining that a sign designation of the last non-zero coefficient according to the reverse scan order is not hidden; and if the count of modifiable coefficients in the set of coefficients is greater than the predetermined number: wherein the predetermined number is 4.