Image Ranging System with Cosine-7 Intensity Profile
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Solution Overview
Problem
Conventional image ranging systems are unable to accurately detect 3D depth information due to non-uniform illuminance distribution and approximation assumptions, limiting them to 2D manipulations on touch screens.
Innovation Solution
An image ranging system with a light source module having a luminous intensity profile of I1=1/cos7 θ and an image sensing module with an image sensing lens where the imaged height ratio (h1/f) is proportional to sin θ, utilizing the time of flight technique for accurate 3D depth calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light source with intensity profile I0=1/(cos θ)4 is used, then the system can operate with simple optical components, but the illuminance distribution becomes non-uniform and 3D depth detection accuracy deteriorates
Solution Approach 1:
The patent changes the intensity distribution parameter of the light source from the conventional I0=1/(cos θ)4 to a specific intensity profile I1=1/cos7 θ. This parameter modification compensates for the cosine^7 θ variation in the optical path, resulting in uniform illuminance distribution across the object surface and thereby improving 3D depth detection accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and pre-configuring the specific intensity profile I1=1/cos7 θ in the light source module before the imaging process. This preliminary intensity distribution design ensures that when light interacts with the object and returns through the optical system, the illuminance is uniformly distributed, eliminating the need for complex real-time corrections.
2Measurement precision
If the time of flight technique is used with approximation assumptions for small angles, then the calculation is simple, but the vertical distance calculation becomes inaccurate for large angles
Solution Approach 1:
The patent changes the mathematical model parameter by introducing the specific intensity profile I1=1/cos7 θ that compensates for the optical path variations. This allows the system to maintain accurate depth calculation across all angles without relying on small-angle approximations, as the intensity profile inherently accounts for the cosine^7 θ variation in the optical path.
Solution Approach 2:
The patent applies feedback by using the image sensing element to detect the actual illuminance distribution and comparing it with the expected uniform distribution. This feedback mechanism allows the system to verify and correct depth calculations, ensuring accuracy even for large angles by detecting and compensating for any residual optical path variations.
3Measurement precision
If the light source and image sensing element are placed far apart, then the system can capture more light, but the illuminance distribution becomes non-uniform and 3D information detection deteriorates
Solution Approach 1:
The patent changes the intensity distribution parameter of the light source to I1=1/cos7 θ, which specifically compensates for the inverse square law and cosine^7 θ variation that occurs when the light source and sensor are placed apart. This parameter modification ensures that even at extended distances, the illuminance remains uniformly distributed across the object surface, maintaining 3D detection accuracy.
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 configuration enhances sensitivity and accuracy in detecting 3D depth information, overcoming the limitations of conventional systems by providing uniform illuminance and precise vertical distance calculation.
Implementation Method 1
a light source diode and a light source lens, an optical signal emitted from the light source diode passing through the light source lens with a luminous intensity profile which is characterized by an intensity I1
Implementation Method 2
the object reflecting the optical signal and thus generating a reflection signal
Implementation Method 3
the reflection signal irradiating the image sensing lens at an angle the same as the emission angle θ of the optical signal and forming an image of the object on the image sensing element
Implementation Method 4
utilizing the time of flight technique for accurate 3D depth calculation
Data Source
AI summary
An image ranging system has a light source module having a light source diode and a light source lens, and an image sensing module, placed near the light source, having an image sensing device and an image sensing lens. An optical signal emitted from the light source diode passes through the light source lens with a luminous intensity profile which is characterized by intensity I1 and then reaches an object. A reflection signal is generated by the object. The relationship between the intensity I1 and the emission angle θ of the optical signal is I1=1/cos7 θ. The reflection signal into the image source lens has an incident angle θ the same as the emission angle of the optical signal, and images the object onto the image sensing device. The ratio of the height of object image to the effective focal length of image sensing lens is proportional to sin θ.