Image Sensor Brightness Adjustment for Uniform Background Light
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Solution Overview
Problem
Existing image sensors often produce non-uniform background light image brightness, leading to incorrect determination of object location and barycentre, especially when objects block light, causing dark image regions with varying brightness distributions.
Innovation Solution
An image sensor system that adjusts the amplifying or adjusting parameters for different image sensing units in the matrix to achieve uniform background light image brightness, using an image sensing matrix, analog to digital converter, adjusting unit, operational circuit, and control unit to compute and adjust brightness signals within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform light intensity is used across all light guiding devices, then the device structure is simple, but the background light image brightness becomes non-uniform
Solution Approach 1:
The patent applies local quality by setting different amplifying ratios for image sensing units in different regions of the image sensing matrix. Specifically, units corresponding to regions with stronger background light use lower amplifying ratios, while units in regions with weaker background light use higher amplifying ratios. This compensates for the non-uniformity caused by uniform light guiding device intensities, achieving uniform background light image brightness without modifying the light guiding devices themselves.
2Illumination intensity
If different amplifying ratios are set for different image sensing units, then background light image brightness uniformity is improved, but the signal processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing the optimal amplifying ratios for each image sensing unit based on the known background light distribution pattern. The control unit retrieves these pre-set amplifying ratios and applies them during normal operation, avoiding the need for complex real-time calculations and reducing signal processing complexity while maintaining brightness uniformity.
3Measurement precision
If high amplifying ratio is used for all image sensing units, then sensitivity to blocked light is improved, but noise in regions with strong background light increases
Solution Approach 1:
The patent applies local quality by using different amplifying ratios for image sensing units in different regions. Units in regions with strong background light use lower amplifying ratios to prevent noise amplification, while units in regions with weak background light use higher amplifying ratios to maintain sensitivity to blocked light. This region-specific approach optimizes both sensitivity and noise control simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures uniform background light image brightness without complex computations, preventing incorrect object location and barycentre determination, and expands the application range of the image sensor by processing signals differently for various units.
Implementation Method 1
An image sensor is an apparatus that can transfer light to voltage charge
Data Source
AI summary
An image sensor comprising: an image sensing matrix, comprising at least one image sensing unit, for generating at least one image sensing signal according to a sensed image; an analog to digital converter, for converting the image sensing signal to a digital image sensing signal; an adjusting unit, for adjusting the digital image sensing signal to be an adjusted digital image sensing signal according to at least one adjusting parameter and the digital image sensing signal; an operational circuit, for computing at least part of brightness of the sensed image sensed by the image sensing unit according to the adjusted digital image sensing signal to generate at least one operational brightness signal; and a control unit, for adjusting the adjusting parameter, such that brightness information generated based on brightness values, which corresponds to the operational brightness signal, falls in a predetermined range.