Adaptive Pixel Range Encoding for Image Compression
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Solution Overview
Problem
Existing video compression standards determine pixel value ranges based on preset bit depths, leading to inefficiencies in image encoding and decoding, as actual image pixel value ranges differ from those determined by bit depth, resulting in discarded pixel values and reduced encoding and decoding efficiency.
Innovation Solution
An image encoding and decoding method that uses the actual pixel value range of the image, including obtaining and encoding the pixel value range for units like pictures, slices, or blocks, and generating a bitstream with encoded pixel value range information, allowing for more accurate representation and prediction of pixel values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel value range is determined according to preset bit depth, then encoding process is simplified, but pixel values beyond the determined range are discarded through clipping, reducing encoding efficiency and image quality
Solution Approach 1:
The patent applies dynamics by making the pixel value range adaptive rather than fixed. The encoder dynamically determines the actual pixel value range present in the input image and adjusts the clipping thresholds accordingly, allowing the encoding process to adapt to different image characteristics and maximize encoding efficiency for each specific image.
Solution Approach 2:
The patent changes the parameter of pixel value range from a fixed value determined by bit depth to a variable parameter that is actually present in the image. By encoding and transmitting the actual minimum and maximum pixel values, the system allows the decoder to reconstruct the correct clipping range, thereby preserving all meaningful pixel information while maintaining encoding simplicity.
2Device complexity
If pixel value range is determined according to preset bit depth, then device complexity is reduced, but pixel values beyond the determined range are discarded, reducing manufacturing precision
Solution Approach 1:
The patent applies preliminary action by performing a scan of the input image to determine the actual pixel value range before the main encoding process. This preliminary step identifies the minimum and maximum pixel values present, allowing the encoder to set appropriate clipping thresholds in advance, thereby preventing discission of any pixel information that falls within the actual image range.
3Ease of operation
If pixel value range is determined according to preset bit depth, then ease of operation is improved, but pixel values beyond the determined range are discarded, reducing adaptability to different images
Solution Approach 1:
The patent applies universality by creating a encoding approach that works for all types of images regardless of their specific pixel value distributions. The method universally determines the actual pixel range for each image and uses that information to guide the encoding process, making the system adaptable to diverse image types while maintaining a unified encoding framework.
Data Source
AI summary
An image encoding/decoding method using a pixel value range constituting an image is disclosed, wherein the image decoding method using a pixel value range constituting an image comprises the steps of: receiving a bitstream; acquiring information of a pixel value range forming a first unit image included in the received bitstream; and decoding the first unit image on the basis of the acquired information of the pixel value range. Therefore, compression efficiency can be improved in an image encoding or decoding process.