Image Sensor Drive Cycle Synchronization for Moiré Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing photographing apparatuses that achieve an optical low-pass filter effect without using an optical low-pass filter suffer from nonuniformity, leading to instability in eliminating moiré and false color due to uneven incidence of light rays on image sensor pixels, caused by the mismatch between the image sensor's drive cycle and exposure time.
Innovation Solution
The apparatus optimizes the drive cycle of the image sensor to ensure the exposure time is an integer multiple of the drive cycle, allowing the image sensor to trace a predetermined path within the exposure time, thereby ensuring uniform light incidence on pixels of different colors, which is achieved through a system comprising an image sensor, a moving member driver, an exposure time setter, a drive cycle setter, and a moving member drive controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the image sensor traces a predetermined path to achieve optical low-pass filter effect, then moiré and false color are eliminated, but the optical low-pass filter effect becomes nonuniform when exposure time is not an integer multiple of drive cycle
Solution Approach 1:
The patent changes the parameter relationship between exposure time and drive cycle by requiring exposure time to be an integer multiple of drive cycle. This parameter synchronization ensures that the image sensor completes full predetermined paths during exposure, making light incidence uniform across all pixels and achieving stable optical low-pass filter effect.
2Object-affected harmful factors
If an optical low-pass filter is used to reduce moiré and false color, then these phenomena are eliminated, but resolving power and contrast deteriorate
Solution Approach 1:
The patent replaces the conventional optical low-pass filter (a physical optical component) with a mechanical movement system. By moving the image sensor to trace a predetermined path during exposure, the system achieves the same moiré and false color reduction effect without the resolving power loss that characterizes traditional optical low-pass filters.
Data Source
AI summary
In a photographing apparatus and a photographing control system which drive an image sensor (moving member) to obtain an optical low-pass filter effect, an exposure time setter sets an exposure time; a drive cycle setter sets the drive cycle of the moving member so that the exposure time, which is set by the exposure time setter, becomes an integer multiple of the drive cycle; a moving member drive controller drives the moving member and controls the operation thereof via the moving member driver so that the moving member traces a predetermined path an integer number of times in a plane orthogonal to an optical axis within the exposure time, which is set by the exposure time setter, based on the drive cycle, which is set by the drive cycle setter.