Image Processing Apparatus Layered Compression Artifact Correction
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Solution Overview
Problem
Current image compression techniques, such as high compression PDF, face challenges in maintaining image quality while achieving high compressibility, especially when handling line drawings and design images, as they often result in image degradation due to irreversible compression methods.
Innovation Solution
The proposed solution involves an image processing apparatus and method that generates multiple image layers (binary, line drawing, and background) from an input image, applying suitable compression methods to each layer, and then correcting the decompressed image to remove artifacts caused by irreversible compression, thereby enhancing image quality and compressibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If irreversible compression is applied to the entire image to achieve high compressibility, then data amount is reduced, but image quality deteriorates due to compression artifacts
Solution Approach 1:
The image is segmented into multiple layers based on visual importance: a first image layer containing visually important components (line drawings, text) and a second image layer containing visually less important components (background, design elements). Different compression methods are applied to each layer, with lossless compression for the first layer and lossy compression for the second layer, thereby reducing overall data amount while preserving critical image quality
Solution Approach 2:
Different compression qualities are applied to different regions of the image based on their visual importance. The first image layer (visually important areas) is compressed with lossless methods to maintain high quality, while the second image layer (visually less important areas) is compressed with lossy methods to achieve higher compression ratios, creating a locally optimized compression strategy
2Manufacturing precision
If lossless compression is applied to line drawing layers to maintain quality, then image quality is preserved, but compressibility is reduced
Solution Approach 1:
The image is divided into a first image layer containing line drawings and text that require lossless compression, and a second image layer containing background and design elements that can tolerate lossy compression. This segmentation allows the line drawing layer to maintain high quality while the overall file size is reduced through aggressive compression of the second layer
Solution Approach 2:
The compression parameter (lossless vs. lossy) is changed based on the type of content in each image layer. The first image layer uses lossless compression parameters to preserve line drawing quality, while the second image layer uses lossy compression parameters to achieve higher compression ratios, optimizing the trade-off between quality and compressibility
3Quantity of substance
If lossy compression is applied to design image layers to increase compressibility, then data amount is reduced, but image quality deteriorates
Solution Approach 1:
Different compression qualities are applied locally to different image layers based on their visual importance. The second image layer containing design elements and background is compressed with lossy methods since these areas are less critical to perceived image quality, thereby achieving higher compression ratios without significantly impacting overall image perception
Data Source
AI summary
An image processing apparatus includes circuitry. The circuitry irreversibly compresses an input image to generate an irreversibly compressed image. The circuitry decompresses the irreversibly compressed image to generate a decompressed image. The circuitry corrects a surround of a target area in the decompressed image to generate a corrected image. The target area corresponds to a line drawing image included in the input image. The circuitry generates first to third image layers from the corrected image. The first image layer is a binary image including a line drawing alone. The second image layer includes a line drawing area. The third image layer includes a background area. The circuitry reversibly compresses the first image layer and irreversibly compress the second and third image layers. The circuitry generates an output file based on the first to third image layers compressed.