Image Processing Device Using 1D Filters to Reduce Moire
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Solution Overview
Problem
Existing image processing devices face challenges in displaying high-quality images with simple configurations, particularly in preventing image deterioration such as moire effects, due to limitations in frequency band management and pixel arrangement.
Innovation Solution
An image processing device is configured with a filter processing section that uses one-dimensional filters to limit the frequency band of input images, an image expanding section that increases the number of pixels, and an image dividing section that shifts and arranges pixels to generate high-quality images with improved resolution and reduced moire effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional two-dimensional filters are used to limit frequency bands, then image quality is improved, but device complexity increases due to more line buffers and multipliers
Solution Approach 1:
The patent divides the two-dimensional frequency band limiting operation into sequential one-dimensional filter operations. First, a horizontal one-dimensional filter limits the frequency band in the horizontal direction, then a vertical one-dimensional filter limits the frequency band in the vertical direction. This segmentation reduces the computational complexity from O(N²) to O(N), eliminating the need for complex two-dimensional filter implementations with multiple line buffers and multipliers.
Solution Approach 2:
The patent transforms a two-dimensional filtering problem into a sequence of one-dimensional filtering problems by applying filters along different spatial dimensions (horizontal then vertical). This dimensionality decomposition approach maintains the effectiveness of frequency band limiting while dramatically simplifying the hardware implementation requirements.
2Manufacturing precision
If pixel shifting is applied to display multiple images, then image quality is improved, but image deterioration such as moire effects occurs due to frequency band issues
Solution Approach 1:
The patent applies frequency band limiting through one-dimensional filters to the input image before the pixel shifting and image division operations. This preliminary frequency control prevents high-frequency components that would cause moire effects from being amplified during the subsequent pixel manipulation operations, thereby preventing image deterioration before it occurs.
Solution Approach 2:
The patent converts the potential harmful effect of pixel shifting (which can cause moire effects) into a beneficial super-resolution effect. By carefully controlling the frequency bands with one-dimensional filters before shifting, the pixel shifting operation becomes a method to generate additional pixels and improve resolution without introducing artifacts, transforming a harmful operation into a beneficial one.
Data Source
AI summary
A projector configured to generate a first image and a second image to be displayed by a projection section, the projection section displaying first pixels constituting the first image and second pixels constituting the second image so that the second pixels are shifted with respect to corresponding ones of the first pixels, includes a filter processing circuit configured to execute a filter process of limiting a frequency band of an image signal of an input image with a one-dimensional filter to generate an intermediate image, an image expanding circuit configured to expand the intermediate image to generate a second expanded image, and an image dividing circuit configured to divide some of second expanded pixels constituting the second expanded image into the first image and the second image.