Model based bit rate control for a macroblock encoder

US7720145B2 · kind B2 · utility

Assignee

• ITTIAM SYSTEMS (P) LTD. · IN

Inventors

• Murali Babu Muthukrishnan · Bengaluru, IN
• Arvind Raman · Alamitos, US
• Bhavani Gopalakrishna Rao · Savanuru, IN
• Sankaranarayanan Parameswaran · Savanuru, IN
• Sriram Sethuraman · Hightstown, US
• Dileep Kumar Tamia · Bengaluru, IN

Key dates

• Filing date: May 5, 2005
• Grant date: May 18, 2010
• Expiry date: Feb 16, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/61
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for achieving bit rate controlled encoding, e.g., constant bit rate, uses a bit rate control model based on bits allocated per macroblock and based on error in estimating bits consumed in an encoding process in a macroblock. The method computes bits consumed per macroblock as a function of the formed bit rate control model, and allocates bits for the macroblock. To this end, a quadratic (second order) equation is used for the model, which equation might default into a first order equation requiring fewer computations, in the event that no second order solutions exist. In one form, the bit rate control model computes the bit rate to satisfy video buffer verifier (VBV) compliance in accordance with MPEG requirements. The bit rate control model makes allowances for the type of macroblock, i.e., inter, intra or bidirectional, and provides for any frame-skips.