Video Decoding With Coefficient Correction for Low-Bitrate Upscaling
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Solution Overview
Problem
Existing video coding methods face challenges in increasing image resolution and quality while minimizing the required data amount, particularly when enhancing resolution from a low-resolution image to high-resolution image, as suggested methods lead to increased data requirements.
Innovation Solution
A video coding method that generates and outputs coefficient modification information to modify orthogonal transformation coefficients, allowing for improved image quality and resolution with reduced data usage, by grouping coefficients into ranges, using linear prediction, and calculating correlation levels, which is then used in the decoding process to enhance the decoded image signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hierarchical division method is used to apply existing standard to low-resolution area and new standard to high-resolution area, then compatibility with existing standards is maintained, but the amount of data required for enhancing resolution increases
Solution Approach 1:
The patent extracts only the essential high-frequency coefficient information needed for resolution enhancement rather than transmitting complete high-resolution data. By separating and transmitting only the difference information (high-frequency coefficients) in addition to low-resolution data, the method maintains compatibility while reducing the amount of data required compared to transmitting full high-resolution images.
Solution Approach 2:
The patent implements a nested structure where low-resolution image data serves as the base layer and high-frequency coefficient information is nested as an additional layer. The decoder combines these nested layers to reconstruct high-resolution images, allowing existing decoders to handle the base low-resolution data while optional enhancement is provided by the nested high-frequency information.
2Manufacturing precision
If complete high-resolution image data is transmitted to enhance resolution, then image quality is improved, but data transmission volume increases
Solution Approach 1:
The patent extracts only the critical high-frequency coefficient information that contains the essential details for resolution enhancement, rather than transmitting complete high-resolution pixel data. This extraction approach maintains image quality by preserving the most important frequency information while dramatically reducing data transmission volume.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary high-frequency coefficient information rather than complete image data. This partial transmission of selectively important information (high-frequency components) is sufficient to achieve resolution enhancement without the excessive data volume of complete high-resolution images.
Data Source
AI summary
Provided is a video coding method and a video decoding method increasing the resolution and quality of images while suppressing an amount of data required for increasing the resolution. A video coding apparatus includes a first orthogonal transformation unit performing discrete cosine transform on an input picture signal, a low-pass filter performing low-pass filtering on the input picture signal, a downsampling unit downsampling the resolution of a low-frequency image signal, a coding unit compressing and coding a reduced image signal, a local decoding unit decoding a coded bit stream, a second orthogonal transformation unit performing discrete cosine transform on a decoded image signal, and a modification information generation unit generating, based on input image DCT coefficients and decoded image DCT coefficients, coefficient modification information used for modifying orthogonal transformation coefficients obtained by performing orthogonal transformation on a decoded video signal obtained from a coded bit stream.