Camera System Characterization with Uniform Illuminate
Liu, Yanni (2020)
2020
Degree Programme in Information Technology, MSc (Tech)
Informaatioteknologian ja viestinnän tiedekunta - Faculty of Information Technology and Communication Sciences
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Hyväksymispäivämäärä
2020-09-04
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202006236208
https://urn.fi/URN:NBN:fi:tuni-202006236208
Tiivistelmä
Smartphone camera performance is increasingly important to manufacturers and users, there are many camera technologies has progressed over the years, such as sensor innovation, novel lens design and powerful AI algorithm for image processing. However, market demand for smaller and thinner camera modules requires that manufacturers utilize the latest assembly and testing technologies.
Based on a study conducted on the relative position between the lens and sensor in the com-pact camera module structure, it is discovered that the accuracy of relative movement between lens and sensor could affect the image quality of final camera product. In traditional camera assembly, only the relative position in camera optical axis estimated, which causes the relative translation and tilt to be ignored. It will not only reduce the camera yield in production line but also affect the lab test on camera.
This thesis is proposed to develop and implement an algorithm for testing the characterization of relative movements between lens and sensor of a wide-angle camera under uniform illuminates. The thesis involves three experiments. Firstly, the assembled camera module through focus testing. Secondly, the laboratory active alignment machine is verified. Thirdly, the lens and sensor relative position illumination method is developed. Based on the experimental results, the illumination changing in camera optical axis is quadratic is derived. Besides, the illumination method can indicate the relative translation of lens and sensor based on the image most brightness point detection. However, it is difficult for the illuminate method to indicate the relative tilt of lens and sensor in this thesis.
Illumination method is capable to measure camera module in house movement and handle dynamic measurements. Rather than measuring all the movement cases, it is purposed to provide an indication of relative motion between lens and sensor, thus allowing engineers to quickly check the lens and sensor relative move for the subsequent of camera module assembly.
Based on a study conducted on the relative position between the lens and sensor in the com-pact camera module structure, it is discovered that the accuracy of relative movement between lens and sensor could affect the image quality of final camera product. In traditional camera assembly, only the relative position in camera optical axis estimated, which causes the relative translation and tilt to be ignored. It will not only reduce the camera yield in production line but also affect the lab test on camera.
This thesis is proposed to develop and implement an algorithm for testing the characterization of relative movements between lens and sensor of a wide-angle camera under uniform illuminates. The thesis involves three experiments. Firstly, the assembled camera module through focus testing. Secondly, the laboratory active alignment machine is verified. Thirdly, the lens and sensor relative position illumination method is developed. Based on the experimental results, the illumination changing in camera optical axis is quadratic is derived. Besides, the illumination method can indicate the relative translation of lens and sensor based on the image most brightness point detection. However, it is difficult for the illuminate method to indicate the relative tilt of lens and sensor in this thesis.
Illumination method is capable to measure camera module in house movement and handle dynamic measurements. Rather than measuring all the movement cases, it is purposed to provide an indication of relative motion between lens and sensor, thus allowing engineers to quickly check the lens and sensor relative move for the subsequent of camera module assembly.