Fundus Imaging Display Magnification Adjustment
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Solution Overview
Problem
Conventional fundus cameras with small display units make it difficult for operators to accurately position and focus on the eye due to the small size of the display, which hinders clear observation of the fundus image.
Innovation Solution
A fundus imaging apparatus with a display control unit and a display magnification changing unit that allows for adjustable display magnification, enabling the fundus image to be displayed at different magnifications, with the option to change between a first and second display magnification to facilitate easier positioning and focusing, even on small display units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a general-purpose digital camera with a small display unit is used for fundus imaging, then the device becomes more versatile and cost-effective, but the operator cannot clearly observe the fundus image for accurate positioning and focusing
Solution Approach 1:
The patent implements dynamic display magnification adjustment, allowing the display unit to switch between multiple magnification levels (first display magnification for overall view and second display magnification for detailed observation). This dynamic capability enables operators to adapt the display size to their observation needs, resolving the contradiction between using a compact device and achieving clear observation for positioning and focusing.
2Area of stationary object
If the display unit size is kept small to maintain device portability, then the device remains compact and portable, but the operator has difficulty observing the fundus image clearly for accurate positioning
Solution Approach 1:
The display unit dynamically adjusts its magnification level based on the operator's observation requirements. When detailed observation is needed for positioning and focusing, the system switches to the second display magnification that enlarges the image. When overall view is sufficient, it uses the first display magnification. This dynamic adaptation allows a small physical display unit to provide clear observation capabilities when needed.
Solution Approach 2:
The patent changes the display parameter (magnification level) to resolve the contradiction. By switching between first and second display magnifications, the system transforms the effective display size and detail level without changing the physical display unit dimensions. This parameter change allows clear observation on a compact display when required.
3Measurement precision
If the mask opening portion size is increased to specify a smaller angle of field, then the field of view is reduced for better detail observation, but the overall display area for positioning is reduced
Solution Approach 1:
The system dynamically switches between different mask configurations with different opening portion sizes. The first mask opening specifies a larger angle of field for overall positioning, while the second mask opening specifies a smaller angle of field for detailed observation of specific areas like the optic disk and macular area. This dynamic switching allows the display area to be optimized for the current observation task.
Data Source
AI summary
A fundus image is displayed, which enables accurate positioning and focusing to be easily performed with respect to an eye to be examined even on a small display unit by selecting a display magnification. At a first display magnification, an opening portion “m” of a mask specifying a predetermined angle of field of the fundus is displayed with no part missed in both of horizontal and vertical directions of a display unit 15. At a second display magnification, the opening “m” of the mask is displayed with no part missed in the horizontal direction in the display area of the display unit 15 and with some part missed in the vertical direction. Thus, the second display magnification is used to observe an essential part when the fundus is accurately observed.