Analysis and Control for Adjusting Image Acquisition Rate Based on Object Information in Physical and Image Domains
Date Issued
2006
Date
2006
Author(s)
Peng, Shih-Yuan
DOI
zh-TW
Abstract
In recent years, applications for 3-D positioning have attracted much attention. In previous applications, there is no strategy to adjust image acquisition rate, therefore, the computational load of real-time 3-D positioning and the memory for storing images in a long time will cost much when images are just captured by a higher rate. However, when objects just keep in a static state or move very slowly, the results of 3-D positioning by higher rate are just nearly the same with the lower rate.
This thesis presents three control methods for adjusting image acquisition rate. All these three rate control methods adjust the timing for image acquisition by the calculated results of object velocity. The first control method (Case I) adjusts the image acquisition rate by the information of object velocity in real world. In Case I, all cameras are adjusted to a same image acquisition rate synchronously. The second control method (Case II) adjusts the image acquisition rate by the information of object velocity in image. In Case II, each camera adjusts its image acquisition rate based on its own by the information from its captured images. The third control method (Case III) which can be regarded as a combination of (Case I) and (Case II), also adjusts the image acquisition rate by the information of object velocity in image and let all cameras adjust to same image acquisition rate synchronously.
In a limited memory for image storage, according to the rate control methods that proposed in this study, the recorded duration for desired scenario is longer than that with purely high image acquisition rate. In previous 3-D positioning applications, the positioning results are obtained one image by one image. However, according to the rate control methods proposed in this study, the 3-D positioning results of the moments which are not recorded can be predicted by some mathematical methods. Therefore, the computational load for 3-D positioning process can be saved.
The thesis also presents the experiments of 3-D positioning processes to compare the three control methods. The image processing steps and methods of image analysis for the 3-D positioning processes used in this thesis will be introduced in the fallowing chapters. At last, experimental results for the three control methods are analyzed and compared.
Subjects
三維定位
影像擷取頻率
影像處理
影像分析
頻率控制
3-D positioning
image acquisition rate
image processing
image analysis
rate control
Type
thesis
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