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Method and device for testing and judging nonlinearity responded by remote sensing camera electronics

A technology of remote sensing camera and discrimination method, which is applied in the direction of television, electrical components, color television, etc., can solve the problems of difficult discrimination and unclear understanding of the electronic response of remote sensing camera.

Inactive Publication Date: 2015-09-09
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention solves the problem that the existing test method has unclear understanding of the nonlinearity of the electronic response of the remote sensing camera and is difficult to distinguish, and proposes a device and method for testing and judging the nonlinearity of the electronic response of the remote sensing camera

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  • Method and device for testing and judging nonlinearity responded by remote sensing camera electronics
  • Method and device for testing and judging nonlinearity responded by remote sensing camera electronics
  • Method and device for testing and judging nonlinearity responded by remote sensing camera electronics

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specific Embodiment approach 1

[0024] Specific implementation mode 1. Combination figure 1 Describe this embodiment, remote sensing camera electronic response nonlinear testing and discrimination device, including integrating sphere 1, multiple light sources 2, motor 4, motor driver 3, diaphragm 5, standard illuminance meter 6, CCD under test 7, CCD driver 8 , serial port controller 9, image acquisition card 10 and computer 11; Described a plurality of light sources 2 are symmetrically arranged around the integrating sphere 1; Motor driver 3 is arranged on the integrating sphere 1, is connected with computer 11 by serial port controller 9; Motor 4 is set at the light outlet of the integrating sphere 1, controlled by the motor driver 3; the diaphragm 5 is set at the light outlet of the integrating sphere 1, and is adjusted in size under the drive of the motor 4; the standard illuminance meter 6 and the CCD 7 to be tested are both set at the light output of the integrating sphere The distance between the mou...

specific Embodiment approach 2

[0026] Specific embodiment two, combine Figure 2 to Figure 5 Describe this embodiment, the remote sensing camera electronic response nonlinear test and discrimination method, in this embodiment, starting from the perspective of remote sensing camera electrical signal conversion and transmission, proposed a method based on video response curve and response non-uniformity (PRNU) noise curve The combined method distinguishes the concepts of V / Q nonlinearity and DN / V nonlinearity and gives a discriminant method, which provides theoretical and methodological support for targeted improvement of design and post-correction data.

[0027] Signal conversion and transmission model of remote sensing camera under ideal conditions

[0028] The photon-electron conversion is realized based on the photoelectric effect, without considering factors such as charge diffusion and thermal noise, and the ideal model is shown in formula (1). where Q PIX Store charge for the pixel, R is the responsi...

specific Embodiment approach 3

[0063] Specific embodiment three, combine Figure 6 and Figure 7 Describe this embodiment, this embodiment is the embodiment of specific embodiment two: a certain CMOS camera imaging electronics system is tested: first utilize light source control and image acquisition system, carry out image acquisition from dark field to saturation output illuminance gradient, Collect several array images for each illuminance and calculate the average value of the images, and draw the video response curve as Figure 6 As shown, the visible video response curve has obvious non-linearity. At this time, it can be judged that there is some nonlinear factor in the camera. In order to determine the type of nonlinearity, the PRNU noise curve test of the CMOS camera is further completed, and the results are as follows Figure 7 shown. The PRNU noise factor gradually decreases with the increase of illumination, so it can be judged that the camera has V / Q nonlinearity. To solve the V / Q non-linea...

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Abstract

A method and a device for testing and judging nonlinearity responded by remote sensing camera electronics relate to the testing field of remote sensing camera electronics and solve the problem that the nonlinearity responded by remote sensing camera electronics is not clearly recognized and is hard to judge. The method comprises the step of judging and differentiating V / Q nonlinearity and DN / V nonlinearity responded by the remote sensing camera electronics by drawing a video response curve and responding to a non-uniformed noise curve. The device for testing and judging nonlinearity responded by remote sensing camera electronics comprises integrating sphere, a light source, an electric motor, a motor driver, a diaphragm, a standard illuminometer, a measured CCD, a CCD driver, a serial controller, an image collecting card and a computer, wherein the image collection should be performed under a darkroom. The method and the device of the invention can be used for effectively differentiating the V / Q nonlinearity and the DN / V nonlinearity responded by the remote sensing camera electronics, specifically improving design and providing theories and methods for later correction data.

Description

technical field [0001] The invention relates to the field of remote sensing camera electronics testing, in particular to a remote sensing camera electronics response nonlinear testing and discrimination method and device. Background technique [0002] The remote sensing camera is a digital camera with CCD (CMOS) as the core imaging device, and its information transmission process is as follows: image 3 shown. After the optical signal reaches the imaging target surface, it is photoelectrically converted into a charge (Q), and then a voltage signal (V) is formed through charge storage, transfer, and measurement, and finally converted into a video code value signal ( DN). This process includes three conversions of photon-electron, electron-voltage, and voltage-code value. Ideally, the three conversions are all linear processes, but there are nonlinear factors in practical work. The nonlinearity generated by electronic-voltage conversion is defined as V / Q nonlinearity, and t...

Claims

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Application Information

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IPC IPC(8): H04N17/00H04N5/372H04N5/374
Inventor 兰太吉李俊霖贺庚贤宁飞
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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