Qualcomm Incorporated

Praneeth Paladugu

Ashish Bajaj

Venkata Naga Poleswara Rao Karuchula

Aditya Bhuvanagiri

Surya Manikya Phanindra Kalanadhabhatla

This disclosure relates to techniques for preventing or reducing the appearance of undesirable color and/or gray patches in decoded video sequences due to generation of out-of-bound quantized transform coefficients during video encoding. Insufficient compression of a video block according to a selected encoding mode and a selected quantization parameter (QP) value may result in the generation and subsequent clipping of out-of-bound quantized transform coefficients for a given video coding standard. The techniques include predicting whether out-of-bound quantized transform coefficients will be generated for a video block, and adjusting at least one of the selected encoding mode and the selected QP value for the video block to prevent the generation of out-of-bound quantized transform coefficients. According to the techniques, the generation of out-of-bound quantized transform coefficients for a video block may be predicted based on difference parameter threshold values, which may be pre-generated and stored in a video encoder.

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Hyderabad Telangana, India

Praneeth Paladugu