US 8175148

Here is a concise summary of US patent 8175148:

US Patent 8175148: Method and device for indicating quantizer parameters in a video coding system

• Title: Method and device for indicating quantizer parameters in a video coding system
• Current Assignee: Nokia Inc.
• Original Assignee: Nokia Inc.
• Inventor: Jani Lainema
• Filing Date: 2007-07-26
• Issue Date (Publication Date): 2012-05-08
• Abstract: A method and device for coding a digital video sequence is disclosed, where an indication of a quantization parameter (QP) is provided in the encoded bit-stream for decoding purposes. The QP-related information is indicated by introducing a sequence-level quantization parameter value (SQP). Instead of coding the absolute values of picture/slice QPs, an indication of the difference (ΔQP) between the sequence-level quantization parameter (SQP) and the picture/slice QP is provided. This eliminates the need to transmit a full QP for every picture/slice, enabling a statistically smaller difference value to be transmitted, thereby reducing the transmission bit-rate. The difference value is subsequently used in a corresponding decoder to reconstruct the picture/slice QP.

Plain-Language Overview of Independent Claims:

The patent includes several independent claims, generally covering methods and devices for both encoding and decoding video sequences using a sequence-level quantization parameter (SQP) and difference values (ΔQP).

• Independent Claim 1 (Method of Encoding): This claim describes a method for encoding a digital video sequence. It involves defining a default quantization level (SQP) for the entire video sequence. When quantizing transform coefficients (derived from prediction error values or pixel values), the actual quantization level can be expressed as a difference (ΔQP) from this default SQP. An indication of this ΔQP is then included in the encoded bit-stream. This allows for more efficient transmission of quantization information.
• Independent Claim 13 (Method of Decoding): This claim outlines a method for decoding an encoded digital video sequence. It involves defining a default inverse quantization level (which matches the encoding's SQP). When inverse quantizing the received data, the actual inverse quantization level is determined by adding a difference value (ΔQP) (retrieved from the bit-stream) to the default inverse quantization level. This reconstructs the original quantization level used during encoding.
• Independent Claim 22 (Encoder Device): This claim describes a video encoder configured to perform the encoding method of Claim 1. Specifically, it is arranged to define a sequence-level quantization parameter (SQP) and to encode the actual quantization levels for frames or segments as a difference (ΔQP) relative to the SQP, providing this ΔQP in the bit-stream.
• Independent Claim 33 (Decoder Device): This claim describes a video decoder configured to perform the decoding method of Claim 13. It is arranged to define a default inverse quantization level (SQP) and to reconstruct the actual inverse quantization level for frames or segments by combining a retrieved difference value (ΔQP) with the default SQP.
• Independent Claim 44 (Multimedia Terminal with Encoder): This claim covers a multimedia terminal that includes the video encoder as described in Independent Claim 22.
• Independent Claim 45 (Multimedia Terminal with Decoder): This claim covers a multimedia terminal that includes the video decoder as described in Independent Claim 33.

CAFC 2026 Dockets Search:

A direct search for "CAFC dockets 2026 US8175148" did not return specific case filings or dockets directly referencing US8175148 within the provided search snippets for 2026. The search results for the U.S. Court of Appeals for the Federal Circuit (CAFC) generally indicate where to find information such as case filings, records, opinions, and scheduled cases, with options to view scheduled cases for April, May, and June 2026. However, these results do not provide a direct search function or specific 2026 docket entries for a given patent number. To find such information, one would typically need to use the court's electronic filing system (CM/ECF) or PACER (Public Access to Court Electronic Records), which were not directly queried in this search. Therefore, as of April 26, 2026, I cannot authoritatively confirm any CAFC 2026 dockets specifically involving US8175148 based on the provided search results.