Radiation calibration system and light source control module thereof

A radiation calibration and light source control technology, applied in the field of radiation calibration, can solve the problems of low radiation calibration accuracy of image sensors, difficulty in ensuring the sequence of response values ​​of image sensors to be calibrated, etc., and achieve the effect of low fitting accuracy

Pending Publication Date: 2019-02-19
上海同繁勘测工程科技有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the radiation calibration method in the prior art is difficult to ensure that the image sensor to be calibrated produces a uniform response value sequence, resulting in low radiation calibration accuracy of the image sensor, and to provide a radiation calibration method. System and its light source control module

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  • Radiation calibration system and light source control module thereof
  • Radiation calibration system and light source control module thereof
  • Radiation calibration system and light source control module thereof

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Embodiment 1

[0047] Such as figure 1 As shown, the light source control module for radiation calibration in this embodiment includes: an acquisition unit 11 , a first calculation unit 12 , a control unit 13 , a model selection unit 14 and a judgment unit 15 .

[0048] The acquiring unit 11 is used to acquire the target pixel value. The target pixel value is also the basic data of the radiometric calibration of the image sensor, which can be a sequence of pixel values ​​corresponding to the sequence of equally spaced radiance, and is determined by the user according to the accuracy requirements of the radiometric calibration.

[0049] The first calculation unit 12 is configured to calculate the radiance that should be output by the calibration light source corresponding to the target pixel value according to the quantum efficiency model. That is to say, the target pixel value is input into the quantum efficiency model to obtain the radiance that the calibration light source should output w...

Embodiment 2

[0077] Such as figure 2 As shown, the radiation calibration system of the image sensor in this embodiment includes: a chamber body, a positioning connection device, an image acquisition module 2 , a calibration module 3 and a radiation calibration light source control module 1 shown in Embodiment 1.

[0078] The positioning connection device is located in the warehouse body, such as image 3 As shown, it is used to fix the lens 7 and the calibration light source 8. The lens 7 includes the image sensor to be calibrated, so that the light outlet of the calibration light source 8 fits the tangent of the lens surface. In this embodiment, the calibration light source uses an integrating sphere.

[0079] Specifically, the positioning connection device includes a lifting platform 61 and a stopper 62, and the lifting platform 61 can control the height of the lens. The limiter 62 is used to fix the calibration light source and the lens including the image sensor to be calibrated, an...

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Abstract

The invention discloses a radiation calibration system and a light source control module thereof. The light source control module comprises: an acquiring unit, configured to acquire a target pixel value; a first calculating unit, configured to calculate a radiance that should be output by the calibration light source corresponding to the target pixel value according to a quantum efficiency model,and calculate an input power of the calibration light source corresponding to the radiance according to the power brightness model, wherein the input parameter of the power brightness model is the radiance, and the output parameter is the input power; and a control unit, configured to generate a power control signal according to the input power, and control the calibration light source according to the power control signal. The radiation calibration system and light source control module thereof can provide any radiance required for radiometric calibration, thereby solving the problem that thetrue quantum efficiency fitting accuracy of the image sensor to be scaled is not high, and provides a basis for the high-precision automatic radiation calibration of the sensor.

Description

technical field [0001] The invention relates to the field of radiation calibration of an image sensor, in particular to a radiation calibration system for consumer-grade CMOS (Complementary Metal-Oxide Semiconductor, metal oxide semiconductor element) and a light source control module thereof. Background technique [0002] Radiometric calibration is one of the main contents of UAV low-altitude remote sensing image preprocessing. Its purpose is to eliminate all kinds of radiation errors caused by the camera during the shooting process, and convert the pixel value (Digital number) of the remote sensing image into the radiance that can truly reflect the physical characteristics. [0003] At present, in the radiation calibration process of the image sensor, a calibration light source (such as an integrating sphere system) with a certain radiance range is mostly used as the true value of the radiance value. During the radiation calibration process, the calibration light source e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/10G01C25/00
CPCG01C25/00G01J3/10Y02B20/40
Inventor 艾梦池周源刘春曾勇
Owner 上海同繁勘测工程科技有限公司
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