Laser Illumination for Dynamic HDR Imaging
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Solution Overview
Problem
Current HDR image production methods are limited by the need for static scenes and camera setups, as they require multiple exposures of varying durations, making it difficult to capture moving objects or scenes dynamically.
Innovation Solution
The use of active laser-based illumination with a sequence of pulses at different wavelengths and intensities allows for rapid image capture, enabling HDR recordings of moving objects without the constraints of traditional exposure series, using a method where individual images are recorded in sync with laser pulses and processed based on intensity information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple exposures of varying durations are used to produce HDR images, then the dynamic range and contrast ratio are improved, but the recording time increases and moving objects cannot be captured
Solution Approach 1:
The patent applies periodic action by using a sequence of laser pulses with different intensities instead of continuous exposure. Multiple pulses (at least three) are emitted in rapid succession with varying intensities, allowing the camera to capture multiple exposure levels within a single brief time window. This resolves the contradiction by maintaining high dynamic range while minimizing total recording time, enabling capture of moving objects that would otherwise be blurred or missed in traditional multi-exposure HDR methods.
Solution Approach 2:
The patent applies preliminary action by pre-planning and pre-positioning the laser illumination system to emit precisely timed pulses before the actual image capture sequence begins. The laser system is configured in advance to deliver a predetermined sequence of intensities, and the camera is synchronized to capture frames during this pre-arranged pulse sequence. This allows the system to capture HDR data rapidly without requiring post-processing alignment of separately taken exposures, thus reducing time loss and enabling moving object capture.
2Illumination intensity
If traditional multi-exposure methods are used, then HDR images with high contrast ratio are achieved, but the camera and scene must remain static
Solution Approach 1:
The patent applies dynamics by making the illumination system active and time-varying rather than static. The laser illumination dynamically changes intensity across multiple pulses, and the system is designed to accommodate moving objects and camera movement. The rapid pulse sequence (completed within milliseconds) freezes motion effectively, allowing the scene and camera to be dynamic during the overall recording process while maintaining HDR quality. This resolves the contradiction by enabling both high contrast ratio and scene adaptability to moving objects.
Solution Approach 2:
The patent replaces the mechanical constraint of static camera positioning with an optical solution using synchronized laser pulses. Instead of requiring the camera to remain physically stationary on a tripod during multiple exposures, the system uses precisely timed optical illumination pulses that are synchronized with the camera's sensor. This substitution of mechanical stability requirements with temporal synchronization of light pulses enables HDR capture of moving scenes without physical constraints on camera or subject motion.
3Loss of information
If exposure series with different exposure times are taken, then details in both bright and dark areas are captured, but the process is too slow for rapidly moving objects
Solution Approach 1:
The patent applies continuity of useful action by maintaining continuous illumination across the pulse sequence without interruption. Rather than taking separate exposures with gaps between them, the laser emits a continuous sequence of pulses with different intensities, and the camera continuously records during this entire sequence. This continuous action ensures that all exposure levels are captured in an unbroken temporal sequence, preserving image detail while achieving high recording speed suitable for rapidly moving objects. The useful action of light capture continues without interruption throughout the pulse sequence.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of HDR images with a significant time advantage, allowing for dynamic scene capture and camera movement, including rapidly moving objects from distant flying platforms, while maintaining image detail across a wide contrast range.
Implementation Method 1
The invention makes it possible to produce highly dynamic images (HDR or DRI images) using an imaging system with active laser-based illumination.
Data Source
AI summary
The invention relates to an apparatus and a method for producing dynamic range increase (DRI) or a high dynamic range (HDR) pictures, in which differently exposed individual images are combined by image processing to form an HDR or DRI picture. In order to also allow moving objects to be recorded more easily, and to overcome the restrictions relating to lack of mobility of a recording device, the exposure can be carried out by laser radiation containing wavelengths at different intensities.