Imaging Device Composite Image Exposure Control
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Solution Overview
Problem
Conventional imaging devices experience a 'flipping feeling' in moving images due to inadequate shutter speed adjustment, leading to unnatural motion and quality degradation, especially when capturing high-definition moving images, as they struggle to balance exposure with frame rate and subject brightness.
Innovation Solution
An imaging device and method that perform imaging at a cycle shorter than the frame rate, using an image sensor and optical lens to generate composite images through predetermined image composition processing based on field brightness, allowing for appropriate exposure without the flipping effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the shutter speed is reduced to achieve appropriate exposure for high brightness subjects, then the exposure amount becomes appropriate, but the electronic shutter speed becomes shorter than the frame rate causing a flipping feeling and unnatural motion
Solution Approach 1:
The patent divides a single frame period into multiple sub-exposure periods, capturing multiple images at different exposure levels. By segmenting the exposure process, the system can use a shorter shutter speed while still achieving appropriate overall exposure through composition of multiple images, thereby eliminating the flipping effect while maintaining natural motion representation.
2Speed
If the shutter speed is adjusted to the recording frame rate to eliminate the flipping feeling, then smooth motion is achieved, but the exposure amount becomes inadequate for high brightness subjects
Solution Approach 1:
The patent merges multiple images captured during sub-exposure periods through composition processing. By combining several images taken at different exposure levels within one frame period, the system achieves both adequate exposure for bright subjects and maintains the frame rate for smooth motion reproduction.
3Illumination intensity
If ND filter or aperture adjustment is used to control exposure, then the exposure amount becomes appropriate, but the quality of moving image degrades due to blinking sensation or device complexity increases
Solution Approach 1:
The patent replaces mechanical aperture adjustment or ND filter insertion with an electronic image composition method. Instead of physically changing optical parameters, the system uses digital processing to compose multiple images with different exposure levels, thereby achieving appropriate exposure without mechanical complexity or blinking artifacts.
Data Source
AI summary
An imaging device that shoots and records a moving image, the device comprising: an imaging section configured to repeatedly perform imaging at a cycle shorter than the frame rate of the moving image and output image data; an image processing section including a plurality of image composition processing, which is preliminarily determined, and configured to generate a composite image by performing image composition on a series of the image data, which are output from the imaging section, in one processing of the plurality of image composition processing; and an exposure calculation section configured to instruct, based on a field brightness, one processing of the plurality of image composition processing of the series of image data.