Three Apple patents involving video encoders, data storage systems and electronic devices have appeared at the US Patent & Trademark Office. Following is a summary of each.
Patent number 7,822,118 is for a method and apparatus for control of rate-distortion tradeoff by mode selection in video encoders. The system of the present invention first selects a distortion value D near a desired distortion value. Next, the system determines a quantizer value Q using the selected distortion value D. The system then calculates a Lagrange multiplier lambda using the quantizer value Q. Using the selected Lagrange multiplier lambda and quantizer value Q, the system begins encoding pixelblocks. If the system detects a potential buffer overflow, then the system will increase the Lagrange multiplier lambda. If the Lagrange multiplier lambda exceeds a maximum lambda threshold then the system will increase the quantizer value Q. If the system detects a potential buffer...| Read more »