Image Edge Enhancement for Low-Resolution Display Peaking
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Solution Overview
Problem
Conventional image pickup apparatuses face challenges in displaying high-resolution images captured at 4K resolution on display devices with lower resolutions, such as qHD, as the high-frequency edge components are lost during resolution conversion, leading to inadequate peaking display and aliasing issues.
Innovation Solution
An image processing device that extracts and enhances edge components using full-wave rectification and low-pass filtering, then combines these with the original image and performs resolution conversion to match the display device's resolution, ensuring accurate focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resolution conversion is performed to match the display device's lower resolution, then the image can be displayed on the device, but the high-frequency edge component is lost
Solution Approach 1:
The patent applies preliminary action by extracting and enhancing the edge component before performing resolution conversion. The edge extraction unit extracts high-frequency edge components from the captured image, and the edge enhancement unit enhances these components before the resolution conversion is applied to the combined image. This ensures that edge information is preserved and emphasized even after downscaling to match the display device's lower resolution.
2Adaptability or versatility
If conventional resolution conversion is applied to downsample the image, then the resolution matches the display device, but aliasing occurs due to thinning of edge components
Solution Approach 1:
The patent performs edge extraction and enhancement as preliminary actions before resolution conversion. By extracting edge components, enhancing them through processing that emphasizes their frequency content, and then combining them with the original image before downsampling, the system prevents aliasing that would otherwise occur during the resolution conversion process.
3Adaptability or versatility
If the display device uses lower resolution than the image pickup apparatus, then the display is more compact, but the peaking display cannot appropriately emphasize edges
Solution Approach 1:
The patent applies preliminary edge extraction and enhancement before the image is displayed on the lower-resolution display device. This ensures that edge components are emphasized and enhanced in the image data before it undergoes resolution conversion, allowing the peaking display to effectively guide focus adjustment even on display devices with lower resolution capabilities.
Data Source
AI summary
An image processing device performs image processing on an image being captured to display the image on a display unit having a resolution lower than a resolution of the image. The image processing device includes an extraction section that extracts an edge component from the image, an edge enhancing section that enhances the edge component by performing low-pass filter processing on the edge component after performing full-wave rectification processing on the edge component, a combining section that combines the enhanced edge component with the image to generate a composite image, and a resolution conversion section that performs resolution conversion of the composite image to match a resolution of the composite image with the resolution of the display unit.