Camera System X-Y Scanning Direction Control for Image Distortion
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Solution Overview
Problem
MOS image sensors used in camera systems suffer from image distortion due to differences in light-receiving times across lines, especially when the subject moves, and existing solutions complicate the structure and increase costs, making them unsuitable for mobile devices.
Innovation Solution
A camera system with an X-Y address method scanning unit that adjusts its main scanning direction based on the motion of the subject, using a main scanning direction control signal to change between horizontal and vertical scanning, allowing concurrent reading of image signals and reducing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a line exposure image sensor is used to enable integration on a single chip and reduce power consumption, then device size and power efficiency are improved, but image distortion occurs when the subject moves due to different light-receiving times across lines
Solution Approach 1:
The patent applies dynamics by making the scanning direction adjustable rather than fixed. The horizontal and vertical scanning units can dynamically switch between horizontal and vertical scanning directions based on the motion direction of the subject, allowing the system to adapt to different scenarios and eliminate image distortion while maintaining line exposure architecture
Solution Approach 2:
The patent changes the scanning direction parameter (from fixed horizontal to switchable between horizontal and vertical) to resolve the image distortion problem. By changing this parameter based on subject motion detection, the system maintains the power-efficient line exposure architecture while eliminating distortion
2Device complexity
If conventional scanning methods are used to simplify the camera system structure, then device complexity is reduced, but image distortion occurs and mechanical shutters are required
Solution Approach 1:
The patent replaces the mechanical shutter system with an electronic scanning direction control system. Instead of using mechanical components to control exposure timing, the system electronically switches between horizontal and vertical scanning directions to achieve the same distortion correction function, thereby simplifying the mechanical structure
Solution Approach 2:
The scanning control unit serves multiple functions: it performs the basic image scanning function and additionally controls the scanning direction to correct image distortion, replacing what would traditionally require separate mechanical shutter components. This multi-functionality reduces overall system complexity
3Ease of operation
If the main scanning direction is fixed in the horizontal direction, then the scanning system is simple to control, but image distortion occurs when the subject moves horizontally
Solution Approach 1:
The patent makes the scanning direction dynamic rather than fixed. The main scanning direction can switch between horizontal and vertical based on the motion direction of the subject, allowing the system to adapt to different scenarios and eliminate image distortion while maintaining simple scanning control logic
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 effectively corrects image distortion caused by focal plane shutters, simplifies the camera system structure, and eliminates the need for mechanical shutters, making it suitable for mobile devices like camera-equipped mobile phones.
Implementation Method 1
The unit pixel comprises a photoelectric conversion element for photoelectrically converting an incident light
Data Source
AI summary
A camera system comprising an imaging unit scanned by means of an X-Y address method, horizontal and vertical scanning units for scanning the imaging unit by means of the X-Y address method, a main scanning direction control signal generating unit for generating a main scanning direction control signal for designating a main scanning direction of the imaging unit, a main scanning direction control unit for controlling the horizontal and vertical scanning units so that the main scanning direction coincides with a direction instructed by the main scanning direction control signal, and an output unit for outputting an image signal read in consequence of scanning the imaging unit using the horizontal and vertical scanning units.