Pointing Device Image Processing for Uneven Lighting
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Solution Overview
Problem
High dynamic range images (HDRI) captured by pointing devices often result in uneven brightness, leading to loss of details and inaccurate determination of direction and distance due to the deviation in image features.
Innovation Solution
An image processing method that divides the original image into blocks, adjusts block brightness using tone curve mapping, and generates complexity signals from gradient values to produce an adjusted image, maintaining image details and improving brightness distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image capturing device captures light rays reflected from the surface, then the pointing device can detect movement, but the brightness distribution becomes uneven causing loss of image details
Solution Approach 1:
The patent divides the captured image into multiple blocks (e.g., 4 blocks) and processes each block independently. This segmentation allows different brightness regions to be handled separately, preserving details in both bright and dark areas while maintaining overall movement detection capability.
Solution Approach 2:
The patent applies different brightness adjustment treatments to different blocks based on their specific characteristics. Each block is adjusted according to its own brightness distribution and detail requirements, allowing local optimization of image quality without compromising overall movement detection accuracy.
2Illumination intensity
If tone curve mapping is applied to adjust brightness, then brightness distribution is improved, but processing complexity increases
Solution Approach 1:
The patent segments the image into blocks and applies tone curve mapping to each block independently rather than processing the entire image at once. This segmentation approach reduces the complexity of brightness adjustment operations while still achieving improved brightness distribution across the image.
Solution Approach 2:
The patent applies tone curve mapping selectively to blocks that require brightness adjustment rather than uniformly applying it to all blocks. This partial application approach optimizes processing complexity by only performing adjustments where necessary while maintaining effective brightness distribution improvement.
Data Source
AI summary
An image processing method is applicable to a pointing device. The pointing device generates a displacement signal by moving relative to a working surface and detecting an image of a part of the working surface. The method includes the following steps. A first original image is obtained. The first original image is uniformly divided into a plurality of blocks. A block brightness value of each block is adjusted. A complexity signal representing a plurality of gradient values of each block is generated. The blocks are sequentially adjusted according to the adjusted block brightness value and complexity signal, so as to generate a first adjusted image corresponding to the first original image.