Vehicle Image Processing Device Rapid Reversing Display
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Solution Overview
Problem
Existing on-vehicle image processing devices face challenges in quickly displaying camera images during reversing operations while adhering to safety standards, often requiring extended preparation times and sometimes displaying undesirable black screens due to synchronization issues between CPU modules.
Innovation Solution
An on-vehicle image processing device is designed with a signal conversion circuit to acquire and convert image signals into standard data and a control circuit that starts modules sequentially to display images and perform data processing, allowing for rapid image display without black screens by initiating a first module for image display and a second module for data processing during reversing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a sub CPU is used to display camera image directly (camera-through image display), then the image display speed is improved and KT safety act is satisfied, but switching noise appears on the display due to synchronization issues between CPU modules
Solution Approach 1:
The patent applies preliminary action by having the sub-CPU start the camera image display process in advance before the main-CPU is fully operational. The sub-CPU begins acquiring camera signals and preparing display data during the main-CPU startup period, so that the image is ready to display immediately when the reversing operation is detected, eliminating the need for black screen masking and resolving the synchronization noise issue.
2Object-affected harmful factors
If a black image is displayed for 2 seconds to hide noise during switching, then the appearance is improved, but the camera image display time is extended and safety is reduced
Solution Approach 1:
The patent extracts the camera image display function from the main-CPU's HMI process and assigns it to a dedicated sub-CPU. This separation allows the camera image to be displayed independently and continuously without interruption, removing the need for black screen masking during main-CPU module loading, thus eliminating the 2-second delay and improving both appearance and safety.
3Reliability
If the main CPU starts modules in sequence through HMI process, then data processing is performed correctly, but the camera image display is delayed and KT safety act cannot be satisfied
Solution Approach 1:
The patent segments the CPU functions into two independent units: the main-CPU handles high-reliability data processing tasks (guide line drawing, HMI processes), while the sub-CPU handles real-time camera image acquisition and display. This segmentation allows both functions to operate simultaneously without interference, ensuring data processing reliability is maintained while achieving the fast image display speed required by KT safety act.
Data Source
AI summary
An on-vehicle image processing device is provided. The on-vehicle image processing unit includes a signal conversion circuit arranged to convert an image signal acquired from an imaging unit into image data of a predetermined standard responding to an external command, and a control circuit arranged to acquire the image data, display an image of the imaging unit on a display unit through starting multiple modules in order, and perform data processing to the image. Upon a user performing a reversing operation, the control circuit starts a first module to display the image data acquired from the signal conversion circuit on the display unit as it is, and subsequently starts a second module to perform predetermined data processing to the image data.