Panoramic Exposure Control for Smooth Luminance Transitions
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Solution Overview
Problem
In panoramic photo shooting, the luminance of composite pictures is not smooth due to lack of exposure control, resulting in significant luminance differences and a poor visual effect for users.
Innovation Solution
A method and device that obtain luminance values for pre-shot pictures and the current environment, calculate a corrected luminance value for subsequent shots using adjustment coefficients and weights, and adjust exposure accordingly to ensure consistent luminance across combined images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pictures are combined during panoramic photo shooting with independent exposure for each picture, then the shooting process is simple and fast, but the luminance of the composite picture fluctuates and is not smooth
Solution Approach 1:
The patent applies preliminary action by pre-calculating the luminance value for the current picture before actual shooting. The system obtains luminance values of previously shot pictures and the current environment, then calculates the expected luminance value for the current picture in advance. This pre-calculated luminance value is then used to control the exposure during shooting, ensuring smooth luminance transitions in the final composite panorama without requiring post-processing adjustments.
Solution Approach 2:
The patent implements feedback by continuously monitoring and comparing luminance values during the panoramic shooting process. The system obtains luminance values of previously shot pictures and the current environment, calculates the expected luminance for the current picture, and uses this feedback information to adjust the exposure parameters in real-time. This closed-loop control ensures that each picture maintains consistent luminance with its neighbors, preventing fluctuations in the composite image.
2Ease of operation
If no special exposure control is applied during panoramic photo shooting, then the operation is simple, but significant light-dark changes occur in the composite picture
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the exposure parameters (such as shutter speed, aperture, or ISO) based on the calculated luminance value for each picture. The system changes the exposure parameters from fixed or manual settings to automated dynamic values that are computed in real-time based on the luminance values of previously shot pictures and the current environment. This ensures consistent illumination intensity across all pictures in the panorama while maintaining ease of operation through automated control.
3Productivity
If independent exposure is performed for each picture without considering previous pictures, then the exposure process is fast, but luminance difference between composite pictures fluctuates
Solution Approach 1:
The patent applies preliminary action by pre-calculating the luminance value for the current picture before actual shooting. The system obtains luminance values of previously shot pictures and the current environment, then calculates the expected luminance value for the current picture in advance. This pre-calculated luminance value is then used to control the exposure during shooting, ensuring smooth luminance transitions in the final composite panorama without requiring post-processing adjustments.
Solution Approach 2:
The patent implements feedback by continuously monitoring and comparing luminance values during the panoramic shooting process. The system obtains luminance values of previously shot pictures and the current environment, calculates the expected luminance for the current picture, and uses this feedback information to adjust the exposure parameters in real-time. This closed-loop control ensures that each picture maintains consistent luminance with its neighbors, preventing fluctuations in the composite image.
Data Source
AI summary
An exposure method in panoramic photo shooting to resolve a problem that luminance of a composite picture in panoramic photo shooting is not smooth, where the method includes obtaining, by a terminal device, luminance values respectively corresponding to M pictures shot in advance and a luminance value of a current environment in which shooting is to be performed, where M is a positive integer, obtaining, by the terminal device by means of calculation according to the luminance values respectively corresponding to the M pictures shot in advance and the luminance value of the current environment in which shooting is to be performed, a luminance value of a picture to be shot, and performing, by the terminal device, exposure according to the luminance value of the picture to be shot.