Image Transmission Device Bit Rate Control for Wireless Reliability
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Solution Overview
Problem
In scenarios where the radio field intensity is weak, the transmission rate of encoded moving image data decreases, leading to potential failures in real-time transmission from an image transmission device to an image reception device, especially when the device is mounted on a mobile body that travels through varying radio field intensities.
Innovation Solution
An image transmission device and control device that utilize an encoder, transmission buffer, transmitter, failure detector, and encoding controller to predict and prevent real-time transmission failures by adjusting the target bit rate based on position, speed, direction, and radio field intensity information, and switch between different encoding modes to maintain reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission bit rate is increased to improve real-time transmission, then the transmission quality improves, but the transmission fails when radio field intensity is weak
Solution Approach 1:
The patent applies dynamics by making the target bit rate adjustable and changeable over time. The encoding controller dynamically adjusts the target bit rate based on predicted transmission conditions, allowing the system to adapt to varying radio field intensities and maintain reliable real-time transmission without fixed high bit rate constraints
Solution Approach 2:
The failure detector performs preliminary action by predicting transmission failures before they occur. Using position information, speed information, direction information, and radio field intensity distribution information, the system anticipates future transmission conditions and adjusts encoding parameters in advance to prevent buffer underflow and ensure continuous real-time transmission
2Reliability
If the target bit rate is decreased to ensure transmission in weak radio fields, then transmission reliability improves, but image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the target bit rate parameter dynamically based on predicted transmission conditions. The encoding controller modifies encoding parameters in response to failure predictions, allowing the system to optimize between transmission reliability and image quality by changing the bit rate parameter according to actual radio field conditions rather than using a fixed low bit rate
3Manufacturing precision
If the encoder continuously operates at high bit rate, then image quality is maintained, but transmission buffer becomes empty in weak radio fields causing real-time transmission failure
Solution Approach 1:
The patent applies feedback through the failure detector that continuously monitors transmission conditions, buffer state information, and radio field intensity distribution. This feedback loop enables the encoding controller to adjust the target bit rate in real-time based on actual transmission conditions, preventing buffer underflow while maintaining optimal image quality
Solution Approach 2:
The system performs preliminary action by predicting transmission failures before they occur. By analyzing position, speed, direction, and radio field intensity distribution information, the failure detector anticipates future transmission conditions and triggers bit rate adjustment in advance to prevent the transmission buffer from becoming empty and ensure continuous real-time transmission
Data Source
AI summary
An encoder encodes moving image data and generates encoded moving image data. A transmission buffer accumulates the encoded moving image data. A transmission/reception unit transmits the encoded moving image data to an image reception device via a wireless communication line. A failure detector predicts whether or not the failure of a real-time transmission of the encoded moving image data occurs, and detects the time until the failure occurs. When the failure is predicted to occur, an encoding controller controls the encoder to decrease, within the detected time, the target bit rate when the encoder encodes the moving image data.