Safety Sensor Image Transmission Using Structural Metadata Checks
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Solution Overview
Problem
Existing safety systems in industrial environments face challenges in reliably transmitting image data without errors, particularly in safety-critical applications where data integrity must be ensured, and conventional methods like checksums or redundant channels are either inefficient or unreliable.
Innovation Solution
A method that adds meta-information to image data before transmission, using a standard communication channel (black channel) to check for data integrity by prepending or appending headers or footers, allowing for fast and reliable error detection without altering the original image data, and utilizing magic numbers and check values to verify the structure and content of the data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multichannel redundant data transmission is used to ensure data integrity, then reliability is improved, but device complexity and hardware effort increase significantly
Solution Approach 1:
The data transmission is segmented into two distinct channels: a main data channel for transmitting image data and a secondary metadata channel for transmitting integrity check information. This segmentation allows the system to use simple, standard communication infrastructure while maintaining data integrity through separate verification paths, avoiding the need for complex redundant hardware channels.
Solution Approach 2:
Metadata acts as an intermediary element that carries integrity verification information (such as checksums or hash values) alongside the main image data. This intermediary mechanism enables error detection without requiring parallel redundant data channels, thus reducing hardware complexity while maintaining reliability.
2Ease of operation
If standard communication channels (black channels) are used for data transmission, then ease of operation is improved, but reliability deteriorates due to potential transmission errors
Solution Approach 1:
Integrity check information (metadata such as checksums or hash values) is calculated and attached to the data before transmission occurs. This preliminary action enables the receiving system to verify data integrity immediately upon reception using standard communication channels, maintaining ease of operation while ensuring reliability through pre-computed verification data.
3Reliability
If checksums or error detection mechanisms are added to verify data integrity, then reliability is improved, but loss of time increases due to additional processing
Solution Approach 1:
Error detection information is prepared in advance during the data generation phase, allowing for rapid verification at the receiving end without requiring time-consuming re-transmission or complex post-processing. The metadata contains pre-calculated integrity values that can be quickly compared against received data.
Solution Approach 2:
Instead of transmitting redundant copies of the entire data set for verification purposes, the system transmits a compact copy or representation of integrity information (such as a checksum or hash value). This copied verification data requires minimal processing time while providing reliable error detection capability.
Data Source
AI summary
A method of transmitting image data in a safety sensor or in a safety system is provided, in which transmission errors are recognized in that meta information is added to the image data prior to the transmission and the meta information is checked after the transmission. The image data are here transmitted by an unsafe communication link, in particular a black channel, the meta information is prepended and/or appended to the image data and/or to the partial packets, and the meta information comprises a piece of information on the structure of the image data.