Spectacle Parameter Measurement via Image Synthesis
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Solution Overview
Problem
Conventional methods for measuring spectacle wearing parameters face challenges in accurately specifying the position of measurement reference points, especially when the spectacle frame obstructs the corneal vertex, leading to unclear and difficult-to-see areas on the face image, particularly with frames having large temple widths.
Innovation Solution
A portable spectacle wearing parameter measurement device using a tablet terminal that displays both the face image with and without a spectacle frame, allowing for image synthesis to enhance visibility of measurement reference points by embedding the frame image into a non-wearing state image, facilitating accurate specification of points like the corneal vertex distance and frame forward-tilt angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a spectacle frame with large temple width is used, then the aesthetic appearance and fit are improved, but the corneal vertex becomes hidden by the temple, making measurement reference point specification difficult and inaccurate
Solution Approach 1:
The patent divides the imaging process into two separate images: one with the spectacle frame worn and one without. This segmentation allows the measurement reference points to be identified on the image without the frame, while still capturing the frame's position and shape characteristics for measurement purposes.
Solution Approach 2:
The patent introduces a computational intermediary process that overlays or correlates the frame-wearing image with the frame-free image. This intermediary processing enables the system to identify measurement reference points accurately by referencing the frame-free image while maintaining the contextual relationship with the worn frame state.
2Device complexity
If conventional single-image measurement method is used, then the device complexity is low, but the measurement accuracy deteriorates when the spectacle frame obstructs critical features
Solution Approach 1:
The patent transitions from a single two-dimensional image to a multi-dimensional approach by capturing and processing two separate images (with and without the frame). This dimensional expansion in the imaging process enables accurate measurement by providing complementary information from different states.
Solution Approach 2:
The patent changes the imaging parameter by capturing images in two different states: with the spectacle frame worn and without it. This parameter change allows the system to extract measurement reference points from the frame-free state while maintaining the ability to measure parameters relevant to the worn state.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A spectacle wearing parameter measurement device 1 used in measurement of a spectacle wearing parameter of a subject who is to wear a spectacle frame, the spectacle wearing parameter measurement device includes: an information processing unit 15 that acquires each of a first image as a face image of the subject in a spectacle-frame wearing state and a second image as a face image in a spectacle-frame non-wearing state and prepares a third image obtained by associating the first image and the second image; a display screen unit 12 that displays the third image prepared by the information processing unit 15; an operation unit 12a that specifies a measurement reference point of the spectacle wearing parameter on the third image displayed on the display screen unit 12; and a measurement computation section 15e that calculates the spectacle wearing parameter by using data of the specified measurement reference point.