Effects of motion of an imaging system and optical image stabilizer on the modulation transfer function

Choi, Hye‐Yeon; Kim, Jong Pil; Song, Min‐Kyu; Kim, Wan Chin; Park, No Cheol; Park, Young Pil; Park, Kyoung Su

doi:10.1364/oe.16.021132

Cited by 23 publications

(14 citation statements)

References 6 publications

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“…Kauhanen and Rouvinen (2006) reported that the handshake of a mobile device was 1.7°and 0-30 Hz. Choi et al (2008) reported that the stroke of the actuator is dependent on the optical imaging system. A drive integrated circuit was considered, which is used in the OIS actuator, and the desired specifications of the OIS actuator and the performance of the conventional actuator are summarized in Table 1.…”

Section: Mechanism Designmentioning

confidence: 99%

Design of a hybrid optical image stabilization actuator to compensate for hand trembling

et al. 2011

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In this paper, a novel hybrid optical image stabilization (OIS) actuator for digital camcorder is proposed. Image stabilization for this hybrid type consists of both radially and tangentially moving components to compensate for hand trembling. The proposed OIS actuator, which uses a voice coil motor method, is divided into two parts: a structure and a magnetic circuit. For the structural part, the driving mechanism consists of two systems: one system is based on a ball guide with a magnetic spring, and the other system is based on a pivot bearing. The former system is typically used as a driving mechanism in mobile devices, whereas the latter system has advantages such as mechanical stability and reduced friction. Overall, a magnetic spring between the magnet and yoke should be considered to select the best magnetic circuit part design and mechanism design. Regarding the electro-magnetic (EM) circuit, two types of EM circuits were designed to satisfy each direction: one circuit is a moving magnet circuit for the radial direction, and the other circuit is a moving coil for the tangential direction. In a digital camcorder, the space for the OIS actuator is limited, and thus, optimized actuator with adequate performances is required. To solve these problems, a sensitivity analysis was performed using the design of experiment procedure. Based on these results, an objective function was defined for the optimization procedure. Finally, the actuator was fabricated, and the dynamic characteristics and feasibility of adapting two types of mechanisms of the suggested OIS actuator were verified. The experimental results indicate that the proposed OIS actuator exhibits sufficient performance for the sensitivity.

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Section: Mechanism Designmentioning

confidence: 99%

Design of a hybrid optical image stabilization actuator to compensate for hand trembling

et al. 2011

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“…The yaw and pitch angle of the camera is converted into the lens displacement which is generated by the OIS actuator as given in Eq. (1) (Choi et al 2008).…”

Section: The Specification Of the Ois Actuatormentioning

confidence: 99%

Improvement of an asymmetric actuator for optical image stabilization

Song

Park

et al. 2011

Microsyst Technol

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This paper presents the improvement of an asymmetric actuator for optical image stabilization in a mobile phone camera. The required specification was defined from typical hand vibrations. The actuator was designed to have an asymmetric shape to reduce its size, but this design caused several problems. These problems were analyzed, and a new electromagnetic component design that solved these problems was proposed. Detailed dimensions of proposed design were obtained through the design of experiments procedure. Simulation results show that the final model exhibited sufficient performance to satisfy the required specification.

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“…They reduce camera resolution and cause image obscuring. For decreasing image shifts, stability of satellite is usually controlled by all kinds of technologies, thus increasing heavily the cost and enlarging the size and weight of the satellite [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of noise on the accuracy of measuring image shifts based on optical correlator

Fan¹

2018

Ukr. J. Phys. Opt.

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Abstract. To measure shifts of images taken by a space camera in real time with high resolution, we suggest a joint transform correlator (JTC). Since, in accordance with operation principles, the signal-to-noise ratio is very low for input JTC images, it is necessary to study the influence of noises on the accuracy of shift measurements. First we explain the principles of measuring the image shifts based on the JTC. Then a white background Gaussian noise and a pattern noise with different variances are added to the input JTC images, and the accuracy of measuring the shifts is simulated for five different processing methods. Finally, we build the experimental platform to implement our technique and study the performance of the image-shift measurements under the conditions when both the background and pattern noises are added together. The simulation and experimental results testify that the measurement accuracy typical for the method of powerspectrum subtraction and binarization with zero threshold is superior if compared with the other four processing methods considered by us. In particular, the corresponding measurement error is less than 0.12 pel even for the input images characterized by the signal-to-noise ratio 1 dB. This meets perfectly typical operating requirements to space cameras.

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Effects of motion of an imaging system and optical image stabilizer on the modulation transfer function

Cited by 23 publications

References 6 publications

Design of a hybrid optical image stabilization actuator to compensate for hand trembling

Design of a hybrid optical image stabilization actuator to compensate for hand trembling

Improvement of an asymmetric actuator for optical image stabilization

Influence of noise on the accuracy of measuring image shifts based on optical correlator

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