Method for decoding transform coefficients corresponding to an image
A method of decoding CAVLC transform coefficients encoded from an image uses a plurality of registers for storing coefficients and flags and a plurality of MUX devices for selecting data input for corresponding registers. The method includes receiving transform coefficients including first and second encoded data corresponding to an image, generating a trailing-one coefficient with a sign indicated by the first encoded data together with a flag value corresponding to a status of the trailing-one coefficient, and generating a non-trailing zero coefficient according to the second encoded data together with a flag value corresponding to a status of the non-trailing zero coefficient.
1. A method for decoding transform coefficients corresponding to an image comprising following steps:
(a) receiving transform coefficients generated from a bitstream encoded from an image, the transform coefficients comprising:
first encoded data including a sign of a trailing-one coefficient in the bitstream; and
second encoded data including a position of a non-trailing zero coefficient in the bitstream;
(b) generating the trailing-one coefficient with a sign indicated by the first encoded data, and a flag value corresponding to a status of the trailing-one coefficient; and
(c) generating the non-trailing zero coefficient according to the second encoded data, and a flag value corresponding to a status of the non-trailing zero coefficient.
2. The method of claim 1 wherein the transform coefficients further comprise third encoded data including a non-zero coefficient; the method further comprising step (d): generating the non-zero coefficient according to the third encoded data, and a flag value corresponding to a status of the non-zero coefficient.
3. The method of claim 2 wherein step (d) comprises shifting the non-zero coefficient and the corresponding flag value.
4. The method of claim 3 wherein step (d) further comprises updating the shifted flag value corresponding to the shifted non-zero coefficient.
5. The method of claim 1 wherein step (b) comprises shifting the trailing-one coefficient and the corresponding flag value.
6. The method of claim 5 wherein step (b) further comprises updating the shifted flag value corresponding to the shifted trailing-one coefficient.
7. The method of claim 1 wherein step (c) comprises shifting the non-trailing zero coefficient and updating the corresponding flag value.
8. The method of claim 1 further comprising providing a plurality of coefficient registers for storing coefficients and a plurality of flag registers for storing flags corresponding to statues of the coefficients.
9. A method for decoding transform coefficients corresponding to an image comprising following steps:
(a) receiving transform coefficients generated from a bitstream encoded from an image, the transform coefficients comprising:
first encoded data including a sign of a trailing-one coefficient in the bitstream;
second encoded data including a position of a non-trailing zero coefficient in the bitstream; and
third encoded data including a non-zero coefficient;
(b) generating the trailing-one coefficient with a sign indicated by the first encoded data, and a flag value corresponding to a status of the trailing-one coefficient;
(c) generating the non-trailing zero coefficient according to the second encoded data, and a flag value corresponding to a status of the non-trailing zero coefficient; and
(d) generating the non-zero coefficient according to the third encoded data, and a flag value corresponding to a status of the non-zero coefficient.
10. The method of claim 9 wherein step (d) comprises shifting the non-zero coefficient and the corresponding flag value.
11. The method of claim 10 wherein step (d) further comprises updating the shifted flag value corresponding to the shifted non-zero coefficient.
12. The method of claim 9 wherein step (b) comprises shifting the trailing-one coefficient and the corresponding flag value.
13. The method of claim 12 wherein step (b) further comprises updating the shifted flag value corresponding to the shifted trailing-one coefficient.
14. The method of claim 9 wherein step (c) comprises shifting the non-trailing zero coefficient and updating the corresponding flag value.
15. The method of claim 9 further comprising providing a plurality of coefficient registers for storing coefficients and a plurality of flag registers for storing flags corresponding to statuses of the coefficients.