Light supplementing device for retina-imitating non-uniform light field

Abstract

The utility model discloses a retina-imitating non-uniform light field light supplementing device, which realizes spatial alignment of light energy distribution and event visual sensor perception requirements through a gradient density Fresnel lens array and a self-adaptive driving module. The device significantly reduces the power consumption, improves the target recognition rate, and is suitable for the fields of security and protection, automatic driving and the like.

Description

Technical Field

[0001] This utility model relates to the field of optoelectronic technology, and in particular to a device for supplementing non-uniform light fields that mimics the retina. Background Technology

[0002] With the continuous development of technology, more and more artificial intelligence technologies are getting closer to people's daily lives. For example, in the fields of autonomous driving, security monitoring and drone obstacle avoidance, existing image recognition technologies can make full use of the captured image information to make relevant identification and judgment by using event vision sensors (EVS). Although more advanced radar solutions can be used for information collection, radar solutions are more expensive. Using lower-cost cameras for information recognition is the current mainstream solution.

[0003] In practical applications, when using cameras to collect information, the image may be unclear due to varying light intensity. Therefore, supplementary lighting devices are needed. Existing designs using uniform light fields suffer from energy waste, increased thermal noise, and poor adaptability. So, how to solve this problem is a challenge we are currently facing. Utility Model Content

[0004] To address the shortcomings of the aforementioned technologies, this invention provides a retinal-mimicking non-uniform light field supplementary lighting device, which utilizes a special lens setup to achieve spatial alignment of light energy distribution with sensing requirements.

[0005] To achieve the above objectives, this utility model provides a retinal-mimicking non-uniform light field supplementation device, comprising a Fresnel lens array and an adaptive driving module. The Fresnel lens array is divided into a central region, a transition region, and an edge region according to concentric circles. The lens density, beam intersection, and light intensity ratio of the three regions decrease sequentially from the center to the outer edge. The adaptive driving module dynamically adjusts the driving current of each region of the gradient density Fresnel lens array.

[0006] Preferably, the Fresnel lens array has a central region radius of 0-15 mm, a lens density of 35 lines / mm, a beam angle of 60°, and a light intensity ratio of 70%.

[0007] Preferably, the Fresnel lens array has a transition zone radius of 15-30 mm, a lens density of 20 lines / mm, a beam angle of 90°, and a light intensity ratio of 20%.

[0008] Preferably, the edge region radius is 30-50 mm, the lens density is 8 lines / mm, the beam angle is 120°, and the light intensity ratio is 10%.

[0009] Preferably, the adaptive drive module uses constant current drive for the central region and pulse drive with a duty cycle of 30% for the edge region.

[0010] Preferably, the Fresnel lens array is fabricated using a grayscale mask lithography process.

[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, the retinal-like non-uniform light field supplementary lighting device provided by this utility model achieves a non-uniform light field by dividing the Fresnel lens array into three regions and by differentiating the lens density and beam angle, and by adjusting the driving current of each region, thereby achieving the technical effect of improving the energy efficiency ratio. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the Fresnel lens array structure of this utility model.

[0013] Description of main components:

[0014] 1. Central area 2. Transition area 3. Edge area Detailed Implementation

[0015] To more clearly illustrate this utility model, it will be further described below with reference to the accompanying drawings. Of course, the scope of protection of this utility model is not limited to this. Simple substitutions that can be made by those skilled in the art without creative effort are all within the scope of protection of this utility model.

[0016] Please see Figure 1 This invention provides a retinal-mimicking non-uniform light field supplementation device, comprising an interconnected Fresnel lens array and an adaptive driving module. The Fresnel lens array is divided into a central region 1, a transition region 2, and an edge region 3 according to concentric circles. The lens density, beam intersection, and light intensity ratio of the three regions decrease sequentially from the center to the outer edge. The adaptive driving module dynamically adjusts the driving current of each region of the gradient density Fresnel lens array. In specific implementation, the light intensity in the central region is concentrated, which can effectively adapt to the high event resolution characteristics of the central region of EVS. The light intensity in the transition region is moderate, so that the light intensity from the central region to the edge region will not deviate within a certain range, avoiding recognition errors or unclear recognition due to excessive light intensity deviation. The light intensity in the edge region is diffused, which can effectively adapt to the sparse pixel sampling requirements of the edge region of EVS.

[0017] The central region of the Fresnel lens array has a radius of 0-15 mm, preferably 10 mm; the lens density is 35 lines / mm, the beam angle is 60°, and the intensity ratio is 70%. The transition region of the Fresnel lens array has a radius of 15-30 mm, typically pre-selected as 25 mm, with a lens density of 20 lines / mm, a beam angle of 90°, and an intensity ratio of 20%. The edge region has a radius of 30-50 mm, preferably 40 mm, with a lens density of 8 lines / mm, a beam angle of 120°, and an intensity ratio of 10%. The adaptive drive module uses constant current drive for the central region and pulse drive with a 30% duty cycle for the edge region. The Fresnel lens array is fabricated using grayscale mask photolithography. In specific implementation, the relevant technical settings for each region are as follows:

[0018]

[0019]

[0020] In the specific implementation process, the emitted light passes through the Fresnel lens array and illuminates the object, and is then captured by the EVS sensor. The adaptive drive module adjusts the Fresnel lens array based on the data received by the EVS sensor, thereby achieving the best illumination effect while reducing energy consumption. More specifically, it first establishes a mapping relationship between the light field intensity and the pixels of the EVS sensor, and dynamically adjusts the driving parameters of each area of ​​the Fresnel lens array, such as current and pulse duty cycle, based on feedback information from multiple detection areas on the EVS sensor, in order to optimize the distribution of light energy.

[0021] In the specific implementation process, the coordinate system is first unified by transforming the pixel coordinate system of the EVS sensor with the coordinate system between the concentric circles of the Fresnel lens, establishing a mapping table, and the transformation formula is as follows:

[0022]

[0023] Where (x0, y0) are the coordinates of the array center, and r is the radial distance of the pixel.

[0024] Based on the real-time data collected by the EVS sensor, the event trigger density within each concentric circle zone is calculated using the following formula:

[0025]

[0026] Where Ni is the number of events in the i-th partition (center / transition / edge), Ai is the partition area, and t is the sampling time window;

[0027] Then, based on the event density Di, the target light intensity ratio of each region is calculated using the following formula:

[0028] I = K * Di + I min

[0029] Where K is the proportionality coefficient, I min This is the minimum light intensity threshold to prevent under-compensation.

[0030] The adaptive drive module adjusts the drive current I according to the magnitude of the light intensity I. C For the central area, the adjustment formula is:

[0031] I C =α*(I-I0)

[0032] Where α is the proportional gain coefficient and I0 is the initial light intensity;

[0033] For the edge and transition regions, the pulse duty cycle β is used for adjustment; the adjustment formula is:

[0034] β=γ*(I / Imax)

[0035] Where γ is the maximum duty cycle and Imax is the maximum permissible light intensity.

[0036] The above-disclosed embodiments are only a few specific examples of this utility model. However, this utility model is not limited thereto. Any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A retinal-simulating non-uniform light field light filling device, characterized in that, It includes a Fresnel lens array and an adaptive drive module. The Fresnel lens array is divided into a central region, a transition region, and an edge region according to concentric circles. The lens density, beam intersection, and light intensity ratio of the three regions decrease sequentially from the center to the outer edge. The adaptive drive module dynamically adjusts the drive current of each region of the gradient density Fresnel lens array.

2. The retinal-simulating non-uniform light field light-supplementing apparatus according to claim 1, wherein, The Fresnel lens array has a central region radius of 0-15 mm, a lens density of 35 lines / mm, a beam angle of 60°, and a light intensity ratio of 70%.

3. The retinal-simulating non-uniform light field light-supplementing apparatus according to claim 1, wherein, The Fresnel lens array has a transition zone radius of 15-30 mm, a lens density of 20 lines / mm, a beam angle of 90°, and a light intensity ratio of 20%.

4. The retinal-simulating non-uniform light field light-supplementing apparatus according to claim 1, wherein, The edge region has a radius of 30-50 mm, a lens density of 8 lines / mm, a beam angle of 120°, and a light intensity ratio of 10%.

5. The retinal-simulating non-uniform light field light-supplementing apparatus according to claim 1, wherein, The adaptive drive module uses constant current drive for the central region and pulse drive with a duty cycle of 30% for the edge region.

6. The retinal-simulating non-uniform light field light-supplementing apparatus according to claim 1, wherein The Fresnel lens array is fabricated using a grayscale mask lithography process.

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