Lensless Camera Mask Alignment Using Color-Based Rotation Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The positional relationship between the mask and the imaging element in a lensless camera affects image quality, requiring precise six-axis adjustments that are time-consuming and labor-intensive.
Innovation Solution
An adjustment device and method that utilizes a mask holding portion, a point light source, and a control unit to adjust the mask's position and angle relative to the imaging element based on the color of light captured, leveraging fresnel zone plates and light-shielding regions to establish a predetermined positional relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If six-axis adjustments (three-axis position + three-axis rotation) are performed to adjust the positional relationship between mask and imaging element, then adjustment precision is improved, but adjustment time and operational complexity increase
Solution Approach 1:
The patent extracts the mask from the complex six-axis adjustment system and performs adjustment based solely on the mask's rotational angle. By fixing the imaging element and only adjusting the mask's orientation, the system reduces the adjustment dimensions from six-axis to single-angle adjustment, significantly reducing adjustment time while maintaining positioning precision through the mask's angular orientation
Solution Approach 2:
Instead of adjusting the imaging element to match the mask position, the patent inverts the approach by keeping the imaging element fixed and adjusting the mask's orientation to achieve the correct positional relationship. This inversion simplifies the adjustment process from multiple degrees of freedom to a single rotational parameter
2Measurement precision
If six-axis adjustments are performed to adjust the positional relationship between mask and imaging element, then adjustment precision is improved, but operational complexity increases
Solution Approach 1:
The patent extracts the essential adjustment parameter from the six-axis system, identifying that only the mask's rotational angle is needed for accurate positioning. This extraction reduces the operational complexity from adjusting six parameters to adjusting a single angle, making the operation simpler while preserving precision
Solution Approach 2:
The patent inverts the conventional adjustment approach by fixing the imaging element and rotating the mask instead. This inversion transforms a complex six-axis adjustment operation into a simple single-angle rotation operation, significantly improving ease of operation
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
Enables high-accuracy and simplified adjustment of the mask and imaging element position, improving image quality by accurately aligning the mask and imaging element.
Implementation Method 1
The FZP acts as an unequally spaced diffraction grating in which the more distant incident light is from the center, the greater the change in direction of the incident light, so that the incident light is concentrated at one point on an optical axis
Data Source
AI summary
There is provided an adjustment device and an operation method of the adjustment device that enable a positional relationship between a mask and an imaging element in a lensless camera to be adjusted with high accuracy and in a simple manner. When white light as incident light passes through a mask including a transmissive region including a plurality of condenser elements and a light-shielding region and provided at a preceding stage of an imaging element, the mask is adjusted to establish an appropriate positional relationship between the mask and the imaging element on the basis of a color of light corresponding to a wavelength of an image captured by the imaging element. The present disclosure is applicable to a calibration device for a mask and an imaging element in a lensless camera.