Image Luminance Range Alignment for Accurate Highlight Warnings
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Solution Overview
Problem
Existing image processing systems fail to appropriately account for the tone characteristics and encoding methods of image data, leading to incorrect processing results, such as incorrect highlight warnings in images.
Innovation Solution
An image processing apparatus and method that adjusts luminance values based on the encoding method by converting image data and associated information to a common numerical range, ensuring appropriate processing regardless of the encoding format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If luminance-based processing is applied to image data without considering the encoding method, then processing speed is improved, but processing accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting the encoding method of image data before performing luminance-based processing. The system identifies whether the image data uses full range or limited range encoding, and pre-adjusts processing parameters accordingly. This ensures that processing accuracy is maintained without sacrificing processing speed, as the encoding detection and parameter adjustment occur in advance rather than during the actual luminance processing.
2Measurement precision
If tone characteristic conversion is applied to align numerical ranges, then processing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying processing parameters based on the detected encoding method rather than converting the entire tone characteristic curve. When limited range encoding is detected, the system adjusts luminance threshold values and processing reference values to match the 64-940 range instead of 0-1023. This approach maintains processing accuracy while avoiding the complexity of full tone characteristic conversion pipelines.
Data Source
AI summary
An image processing apparatus acquires image data and first information relating to a maximum luminance value of an output dynamic range of the image data. The apparatus then applies, to the image data, processing in which a luminance value of the image data and a first value based on the first information are used. In a case in which the image data is encoded in a first numerical range and the first information is encoded in a second numerical range that is different from the first numerical range, the apparatus applies the processing to the image data after converting the image data, the first information, or the first value so that the image data and the first value have values if the image data and the first value would have been encoded in a same numerical range.