Bit Rate Controller Adapting to Scene Light Levels
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Solution Overview
Problem
Existing bit rate control methods for digital video data either result in excessive bandwidth usage or compromised image quality, particularly due to inconsistent light conditions, as they either compress low-detail scenes excessively or high-detail scenes inadequately, and fail to differentiate between foreground and background effectively.
Innovation Solution
A method that determines light levels in captured scenes to set variable maximum bit rates, allowing a smaller portion of the constant quality bit rate at intermediate light levels and a larger portion at high light levels, with differentiated bit rates for foreground and background, and the ability to adjust these rates based on activity in the scene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a constant maximum bit rate is used, then bandwidth usage is controlled, but image quality is compromised in high-detail scenes
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed constant maximum bit rate to a variable maximum bit rate that adapts to scene characteristics. The system dynamically adjusts the maximum bit rate based on detected scene activity levels and light conditions, allowing higher bit rates for active/high-detail scenes and lower bit rates for static/low-detail scenes, thereby resolving the contradiction between bandwidth control and image quality preservation
Solution Approach 2:
The patent implements parameter changes by modifying the maximum bit rate parameter according to scene conditions. Specifically, the system changes the maximum bit rate value based on scene activity detection and light level measurements, enabling the encoder to allocate more bits to important scenes while conserving bandwidth during less critical periods, thus balancing bandwidth usage and image quality
2Manufacturing precision
If variable bit rate is used to maintain image quality, then image quality is preserved in high-detail scenes, but bandwidth usage becomes excessively high
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring scene activity levels and light conditions, then using this information to adjust the maximum bit rate accordingly. The system provides feedback loops where encoding statistics and scene analysis inform subsequent bit rate decisions, preventing excessive bandwidth usage while maintaining quality when needed
Solution Approach 2:
The system dynamically adjusts the maximum bit rate based on real-time scene assessment, allowing the bit rate to be high only when necessary (active scenes with good lighting) and low when unnecessary (static scenes or low-light conditions), thus preventing excessive bandwidth consumption while preserving quality during critical moments
3Manufacturing precision
If high bit rate is used in low-light conditions to maintain quality, then image quality is preserved, but bandwidth is wasted when little detail is visible
Solution Approach 1:
The patent applies parameter changes by adjusting the maximum bit rate parameter based on light level detection. When low light conditions are detected, the system lowers the maximum bit rate since little detail is visible and quality preservation is less critical. When adequate lighting is present, the system increases the maximum bit rate to capture and preserve fine details, thus optimizing bandwidth usage relative to actual quality needs
Data Source
AI summary
The present invention relates to a bit rate controller comprising: a light determination block configured to determine a light level in images of a captured scene; and a maximum bit rate setting block. The maximum bit rate setting block is configured to: upon the light level being determined to be a low light level, set a low-light maximum bit rate; upon the light level being determined to be an intermediate light level, set an intermediate-light maximum bit rate; or upon the light level being determined to be a high light level, set a high-light maximum bit rate. The low-light maximum bit rate is lower than the intermediate-light maximum bit rate. The high-light maximum bit rate is lower than the intermediate-light maximum bit rate.