Video Overlay Readability During Dewarping
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Solution Overview
Problem
Monitoring camera overlays become warped and difficult to read when dewarped by a video management system, especially in wide-angle views, leading to visibility issues for operators.
Innovation Solution
A method and system that apply an image adjustment function to maintain the overlay's position and appearance by spatially rearranging pixels and adjusting values, ensuring the overlay remains readable and visible during dewarping processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the video management system applies dewarping correction to wide-angle video streams, then optical distortions are corrected and image geometry is improved, but the overlay becomes warped and difficult to read
Solution Approach 1:
The patent segments the image processing into two distinct parts: (1) dewarping the background image content, and (2) keeping the overlay portion unchanged. This is achieved by detecting the overlay region and applying the dewarping transformation only to non-overlay pixels, thereby preserving overlay readability while correcting image geometry.
Solution Approach 2:
The overlay is extracted or identified as a separate region from the rest of the image. The system detects the overlay's position and characteristics, then excludes this region from the dewarping transformation, applying the correction only to the background content while leaving the overlay intact.
2Area of moving object
If the overlay is included in the video stream sent by the monitoring camera, then the overlay is integrated with the video content, but the overlay becomes warped along with the image during dewarping
Solution Approach 1:
The patent applies different processing qualities to different regions of the image. The overlay region is treated with one quality (no dewarping transformation) while the rest of the image receives another quality (full dewarping correction). This local differentiation preserves the overlay's shape and readability while correcting the overall image geometry.
Data Source
AI summary
Methods and apparatus, including computer program products, implementing and using techniques for displaying a video. A video stream including a plurality of image frames, wherein at least some image frames include an overlay, is received by a video management system. The video management system determines a position of the overlay within an image frame. The video management system applies an image adjustment function to the image frame to create an adjusted image frame. The image adjustment function uses the determined position of the overlay to adjust the image while keeping the appearance of the overlay essentially unchanged, and the video stream including the adjusted image frame is displayed.