Screen Freeze Detection Using User-Triggered Display Comparison
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Solution Overview
Problem
Existing systems fail to detect a freeze state of a screen display, where the screen remains unresponsive to user operations.
Innovation Solution
An abnormality detection device monitors screen display data and user operations to determine if the screen display transitions within a predetermined period, detecting a freeze state by comparing CRC data before and after the operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional process monitoring methods are used to detect system failures, then internal process failures can be detected through heart beat information, but freeze states of screen display cannot be detected
Solution Approach 1:
The monitoring function is segmented into two independent parts: (1) process-level monitoring using heart beat information to detect internal failures, and (2) display-level monitoring using screen capture and comparison to detect freeze states. This segmentation allows each monitoring method to specialize in detecting specific types of failures without interfering with the other, thereby improving overall detection reliability and precision.
Solution Approach 2:
A screen capture buffer is introduced as an intermediary mechanism to store display state information. The abnormality detection device captures screen images at specific intervals and stores them in the buffer, then compares these captured images with current display states. This intermediary buffer enables precise detection of display freeze states by providing a reference point for comparison, solving the problem of detecting unresponsive screen states.
2Measurement precision
If screen display monitoring is added to detect freeze states, then freeze state detection capability is improved, but system complexity increases
Solution Approach 1:
The abnormality detection device is designed to perform multiple functions: it monitors both process-level heart beat information and display-level screen states, and it can detect both internal process failures and display freeze states. By consolidating these monitoring functions into a single device, the system achieves comprehensive monitoring capability without proportionally increasing overall system complexity, as the device shares common resources such as the processor and memory.
Solution Approach 2:
Instead of implementing complex real-time analysis of display content changes, the system creates simplified copies of the display state in the form of screen captures (images). These captured images are stored in a buffer and compared in subsequent frames. This copying approach transforms complex display state analysis into simple image comparison operations, significantly reducing computational complexity while maintaining effective freeze state detection capability.
3Reliability
If continuous screen monitoring is performed to detect freeze states, then detection reliability is improved, but processing time and computational resources increase
Solution Approach 1:
The system performs screen monitoring at periodic intervals rather than continuously. The abnormality detection device captures screen images at predetermined time points and compares them with previously captured images. This periodic monitoring approach maintains reliable freeze state detection capability while significantly reducing processing time and computational resource consumption compared to continuous monitoring, as the system only processes display states at specific intervals rather than constantly analyzing every pixel change.
Data Source
AI summary
An abnormality detection device detects an abnormality of a screen display displayed on a display. The abnormality detection device is configured to monitor screen display data displayed by the display; determine, based on the screen display data and a user operation regarding the screen display performed by a user, whether or not the screen display has transitioned according to the user operation; extract a screen region which is a target of transition by the user operation within the screen display as a target region; and compare the screen display data corresponding to the target region of when the user operation was performed with the screen display data corresponding to the target region of after a lapse of a predetermined period from the user operation, so as to determine whether or not the screen display has transitioned; and when the screen display does not transition within the predetermined period, determine that the screen display is in a freeze state of being unresponsive to the user operation.