Secondary Camera Detection of Rolling Bands in Primary Video
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Solution Overview
Problem
Existing image capture devices struggle with detecting rolling bands in videos due to conflicting goals between exposure time adjustments for banding detection and image quality, and reliance on ambient light sensors that may be defective or lacking, leading to poor image quality and unreliable banding detection.
Innovation Solution
Utilizing a secondary camera with a low exposure time to detect rolling bands independently, allowing for adjustments to the primary camera's settings without compromising image quality, and comparing ambient light frequencies from both cameras to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the exposure time of the primary camera is increased to reduce rolling bands, then the rolling band visibility is improved, but the dynamic range is reduced and bright areas become overexposed
Solution Approach 1:
A secondary camera is introduced as an intermediary device to detect rolling bands. The secondary camera captures images with a different exposure time (shorter than the primary camera) and analyzes pixel data to detect rolling band patterns. This allows the primary camera to maintain its optimal exposure settings for image quality while the secondary camera provides rolling band detection information.
Solution Approach 2:
The secondary camera creates a copy of the scene capture function with different exposure parameters. By comparing pixel data from the secondary camera (which shows rolling bands more clearly due to shorter exposure) with the primary camera's image data, the system can detect and correct rolling bands without compromising the primary camera's image quality.
2Device complexity
If a single sensor is used for both ALS and flicker detection with different exposure times, then device complexity is reduced, but measurement precision is compromised
Solution Approach 1:
The system dynamically adjusts the exposure time of the secondary camera based on the detection context. For rolling band detection, the secondary camera uses a shorter exposure time to capture flicker patterns more clearly. The system can switch between different exposure time settings depending on whether the priority is rolling band detection or general ambient light measurement, optimizing measurement precision for each specific task.
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
Effectively detects and corrects rolling bands in real-time, maintaining high dynamic range and image quality by optimizing exposure times based on secondary camera data, while ensuring reliable ambient light frequency measurement.
Implementation Method 1
The image sensor includes a plurality of light-sensing pixels that measure an intensity of light incident thereon and thereby collectively capture an image of an environment
Data Source
AI summary
An example method includes displaying, by a viewfinder, a preview of a video of a scene being captured by a primary camera. The method also includes receiving, from an image sensor of a secondary camera, pixel data corresponding to the scene, wherein the primary camera and the secondary camera share a common field of view. The method additionally includes determining, based on the pixel data from the secondary camera, a presence or an absence of a rolling band in the preview of the video being captured by the primary camera.