Multi-Lens HDR Video Object Positioning via Weighted Synthesis
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Solution Overview
Problem
Existing high dynamic range video shooting methods and devices struggle to accurately capture the positions of fast-moving objects in HDR videos due to the requirement for stationary cameras and limited exposure range of camera light sensors.
Innovation Solution
A multi-lens panoramic camera system with different exposure intensities for adjacent lenses, calculating image synthesis weights based on pixel color gray scale variations, differences, and offsets to synthesize high dynamic range panoramic images and videos, ensuring accurate positioning of moving objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple images with different exposure settings are shot continuously to synthesize HDR images, then the brightness range of captured images is improved, but the camera must remain stationary which causes inaccurate positioning of fast-moving objects
Solution Approach 1:
The image is divided into multiple pixel blocks, and each pixel block is independently matched and weighted. This segmentation allows the system to handle fast-moving objects by processing local regions independently, avoiding the need for the entire camera to remain stationary.
Solution Approach 2:
The patent changes the exposure parameter by using multiple shooting lenses with different exposure settings simultaneously. Instead of changing exposure over time (which requires stationary camera), the system captures images with varying exposure parameters at the same moment, enabling HDR synthesis without compromising position accuracy.
2Device complexity
If a single camera with limited photosensitive range is used, then the device complexity is reduced, but the brightness range that can be captured is insufficient
Solution Approach 1:
The patent merges multiple shooting lenses with different exposure settings into a single panoramic camera system. By combining these lenses and their respective images through weighted synthesis, the system achieves an extended brightness range while maintaining a unified device structure.
Solution Approach 2:
Each shooting lens serves multiple functions: capturing images with different exposure settings, contributing to both HDR synthesis and panoramic coverage. This multi-functionality allows a single camera system to achieve both extended brightness range and wide field of view.
3Reliability
If multiple shooting lenses with different exposure settings are used, then the HDR video quality is improved, but the image synthesis complexity increases
Solution Approach 1:
The patent applies local quality by computing synthesis weights for each pixel block independently based on its specific characteristics (gray scale variation, difference, and offset). This localized processing approach manages complexity by breaking down the global synthesis problem into manageable local regions while maintaining high HDR video quality.
Solution Approach 2:
The patent replaces complex mechanical coordination of multiple cameras with a computational approach. Instead of mechanically synchronizing multiple cameras, the system uses image processing algorithms to match and synthesize images from multiple lenses, reducing mechanical complexity while improving synthesis accuracy.
Data Source
AI summary
The present invention provides a high dynamic range video shooting method, comprising: acquiring corresponding images by means of shooting lenses of a multi-lens panoramic camera; determining corresponding image synthesis weights of image pixel blocks according to pixel color gray scale variations, pixel color gray scale differences and pixel color gray scale offsets of the image pixel blocks of each shot image; forming a high dynamic range panoramic shot image based on the image synthesis weights of the image pixel blocks of each shot image; and splicing all the high dynamic range panoramic shot images.