Study on the measurement of image motion between sequential images based on optical correlator

Chao Fan; Ying-cai Li; Yi-tao Liang; Ning-ning Sun

doi:10.1117/12.828667

20 May 2009 Study on the measurement of image motion between sequential images based on optical correlator

Chao Fan, Ying-cai Li, Yi-tao Liang, Ning-ning Sun

Proceedings Volume 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 72831H (2009) https://doi.org/10.1117/12.828667
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

To measure sub-pixel image motion of sequential images which is captured at high frame rate, the joint transform correlator (JTC) is used. The relative image motion of two adjacent images can be measured by inputting these images into JTC. The principle of this method is described, photo-electrical devices are selected, and an experimental platform is built. Based on which, the measurement performances of JTC are researched, including the influence of scene structure on measurement accuracy, effect of the size of input image on measurement accuracy, and the measurement range of the image motion of JTC. After doing these, the over-all properties of JTC is verified by using a sample which containes 50 different random image motions. The results show that, the JTC can measure sub-pixel image motion of two adjacent images entirely, and the accuracy is not variable with the contents of input images. The measurement error submits to normal distribution, which means zero and RMS is no more than 0.12 pixels under conspicuous level equal to 0.05. Lastly, the source of error which deteriorates measurement accuracy is analyzed simply.

Citation Download Citation

Chao Fan, Ying-cai Li, Yi-tao Liang, and Ning-ning Sun "Study on the measurement of image motion between sequential images based on optical correlator", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72831H (20 May 2009); https://doi.org/10.1117/12.828667

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KEYWORDS

Motion measurement

Optical correlators

Spatial light modulators

Joint transforms

CCD cameras

Error analysis

Fourier transforms

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