Image Processing Apparatus Sharpening Filter MTF Correction
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Solution Overview
Problem
Existing image processing technologies fail to effectively correct the gradation characteristics of input image signals to match the display device's characteristics, leading to reduced sharpness and uneven luminance in displayed images.
Innovation Solution
The proposed solution involves an image processing apparatus with a sharpening process section that applies a sharpening filter to the image signal after gradation conversion, using a Lookup Table (LUT) to adjust gradation values and perform γ correction, thereby enhancing the Modulation Transfer Function (MTF) of the display apparatus to match the original image sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sharpening filter is applied to the image signal before gradation conversion, then the sharpness of displayed images is improved, but overflow occurs causing distortion of the image signal
Solution Approach 1:
The patent applies gradation conversion before sharpening filter application. This preliminary action prepares the image signal by converting gradation characteristics to match the display device, preventing overflow during subsequent sharpening operations while maintaining sharpness improvement
Solution Approach 2:
The patent changes the order of processing parameters by performing gradation conversion first, then applying sharpening. This parameter reordering prevents the overflow issue that would occur with traditional sharpening-first approaches, while still achieving the desired sharpness enhancement
2Manufacturing precision
If the MTF of the display apparatus is not corrected, then the processing is simpler, but the displayed image sharpness does not match the original image signal
Solution Approach 1:
The patent applies a sharpening filter with specific parameters designed to compensate for the display device's MTF characteristics. By carefully selecting filter parameters and applying them after gradation conversion, the system achieves MTF correction without requiring complex additional hardware or processing stages
Data Source
AI summary
Technology is known for correcting the gradation characteristics of an input image signal in accordance with the characteristics of a display device, but a correction that is suitable for the usage of the display device is desired. Provided is an image processing apparatus including a first gradation converting section that converts a gradation of an image signal input thereto; a sharpening process section that performs a sharpening process on the image signal after the gradation has been converted by the first gradation converting section; a second gradation converting section that converts the gradation of the image signal after the sharpening process has been performed; and a display control section that displays an image indicated by the image signal after the gradation has been converted by the second gradation converting section, in a display device.