Method and apparatus for suppressing aliasing errors

By moving the camera along the offset path during the shooting process and combining it with Fourier transform processing, the imaging problem caused by moiré interference was solved, achieving the effect of effectively suppressing moiré interference while maintaining high spatial resolution.

CN116134811BActive Publication Date: 2026-07-21TECHNOTEAM HLDG GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TECHNOTEAM HLDG GMBH
Filing Date
2021-04-08
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively suppress moiré interference generated when a camera captures and displays images, especially when the imaging scale is mismatched. Furthermore, conventional methods can lead to a loss of spatial resolution or fail to completely eliminate aliasing errors at extremely low frequencies.

Method used

By moving the camera relative to the display device along an offset path during the shooting process, and using the point spread function caused by the camera movement to convolve with the displayed image, moiré interference can be reduced or eliminated while maintaining high spatial resolution. The method includes offset path optimization and Fourier transform processing.

Benefits of technology

It effectively suppresses moiré interference without sacrificing spatial resolution, enabling accurate detection and evaluation of displayed images, adapting to the characteristics of different display devices, and reducing mechanical load and measurement time.

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Abstract

The invention relates to a method for suppressing aliasing errors in a moire-corrected result image formed from at least one camera image, wherein an imaging of a display image of a display device (2) having display pixels (2.1) with a matrix-shaped arrangement and spaced apart by a display pixel pitch onto a sensor surface (1.2) of a camera (1) comprising imaging optics (1.1) and a sensor surface (1.2) with sensor pixels (1.3) is captured by the camera (1), wherein the camera (1) is shifted relative to the display device (2) along at least one offset path involving a starting position during capturing the at least one camera image. The invention also relates to a method for evaluating the display quality of a pixel-based display device (2) and a device for carrying out such a method.
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