Image Motion Velocity Field for Wide View Remote Sensing Camera and Detectors Exposure Integration Control

Chong, 王翀 Wang; Zheng, 尤政 You; Fei, 邢飞 Xing; Gao-fei, 张高飞 Zhang

doi:10.3788/aos201333.0511002

光学学报

2013

DOI: 10.3788/aos201333.0511002

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Image Motion Velocity Field for Wide View Remote Sensing Camera and Detectors Exposure Integration Control

王翀 Wang Chong¹,

尤政 You Zheng²,

邢飞 Xing Fei³

et al.

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Cited by 4 publications

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Suppressing the image smear of the vibration modulation transfer function for remote-sensing optical cameras

Liu

2017

Appl. Opt.

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In on-board photographing processes of satellite cameras, the platform vibration can generate image motion, distortion, and smear, which seriously affect the image quality and image positioning. In this paper, we create a mathematical model of a vibrating modulate transfer function (VMTF) for a remote-sensing camera. The total MTF of a camera is reduced by the VMTF, which means the image quality is degraded. In order to avoid the degeneration of the total MTF caused by vibrations, we use an Mn-20Cu-5Ni-2Fe (M2052) manganese copper alloy material to fabricate a vibration-isolation mechanism (VIM). The VIM can transform platform vibration energy into irreversible thermal energy with its internal twin crystals structure. Our experiment shows the M2052 manganese copper alloy material is good enough to suppress image motion below 125 Hz, which is the vibration frequency of satellite platforms. The camera optical system has a higher MTF after suppressing the vibration of the M2052 material than before.

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Suppressing the image smear of the vibration modulation transfer function for remote-sensing optical cameras

Liu

2017

Appl. Opt.

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High-Accuracy Self-Calibration for Smart, Optical Orbiting Payloads Integrated with Attitude and Position Determination

Xing

Chu

et al. 2016

Sensors

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A high-accuracy space smart payload integrated with attitude and position (SSPIAP) is a new type of optical remote sensor that can autonomously complete image positioning. Inner orientation parameters (IOPs) are a prerequisite for image position determination of an SSPIAP. The calibration of IOPs significantly influences the precision of image position determination of SSPIAPs. IOPs can be precisely measured and calibrated in a laboratory. However, they may drift to a significant degree because of vibrations during complicated launches and on-orbit functioning. Therefore, laboratory calibration methods are not suitable for on-orbit functioning. We propose an on-orbit self-calibration method for SSPIAPs. Our method is based on an auto-collimating dichroic filter combined with a micro-electro-mechanical system (MEMS) point-source focal plane. A MEMS procedure is used to manufacture a light transceiver focal plane, which integrates with point light sources and a complementary metal oxide semiconductor (CMOS) sensor. A dichroic filter is used to fabricate an auto-collimation light reflection element. The dichroic filter and the MEMS point light sources focal plane are integrated into an SSPIAP so it can perform integrated self-calibration. Experiments show that our method can achieve micrometer-level precision, which is good enough to complete real-time calibration without temporal or spatial limitations.

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Image Motion Measurement and Image Restoration System Based on an Inertial Reference Laser

Ronggang

Wang

Jin

et al. 2021

Sensors

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Satellites have many high-, medium-, and low-frequency micro vibration sources that lead to the optical axis jitter of the optical load and subsequently degrade the remote sensing image quality. To address this problem, this paper developed an image motion detection and restoration method based on an inertial reference laser, and describe edits principle and key components. To verify the feasibility and performance of this method, this paper also built an image motion measurement and restoration system based on an inertial reference laser, which comprised a camera (including the inertial reference laser unit and a Hartmann wavefront sensor), an integrating sphere, a simulated image target, a parallel light pope, a vibration isolation platform, a vibration generator, and a 6 degrees of freedom platform. The image restoration principle was also described. The background noise in the experiment environment was measured, and an image motion measurement accuracy experiment was performed. Verification experiments of image restoration were also conducted under various working conditions. The experiment results showed that the error of image motion detection based on the inertial reference laser was less than 0.12 pixels (root mean square). By using image motion data to improve image quality, the modulation transfer function (MTF) of the restored image was increased to 1.61–1.88 times that of the original image MTF. The image motion data could be used as feedback to the fast steering mirror to compensate for the satellite jitter in real time and to directly obtain high-quality images.

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Image Motion Velocity Field for Wide View Remote Sensing Camera and Detectors Exposure Integration Control

Cited by 4 publications

References 0 publications

Suppressing the image smear of the vibration modulation transfer function for remote-sensing optical cameras

Suppressing the image smear of the vibration modulation transfer function for remote-sensing optical cameras

High-Accuracy Self-Calibration for Smart, Optical Orbiting Payloads Integrated with Attitude and Position Determination

Image Motion Measurement and Image Restoration System Based on an Inertial Reference Laser

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