Among various hardware and software components mobile phones constitute an interesting component for image data acquisition for obvious reasons: They are very inexpensive, light and handy and have CMOS cameras integrated of currently up to 10 Mpixels image format. INTRODUCTION With the availability of very affordable and good resolution CCD/CMOS cameras and other offthe-shelf devices, including compact computers (of laptop type) the potential of building efficient mobile, low-cost, high-performance systems has substantially improved. KEY WORDS: Mobile phone cameras, calibration, accuracy potential, JPEG test. This paper reports about first experiences in calibration and accuracy validation of mobile phone cameras. Using the same testfield we are performing accuracy tests in order to evaluate the metric performance. For this purpose we are currently calibrating various mobile phones over our indoor 3D testfield, using self-calibration. Keywords: geometric accuracy, image noise, JPEG test, mobile phone cameras, modulation transfer function (MTF), operating range, self-calibration, temporal stability.ĪBSTRACT: This paper examines the potential of mobile phones to be used as a front-end sensor for photogrammetric procedures and applications.
However, with proper calibration it is believed that these devices can be used for many photogrammetric tasks. Substantial systematic errors were diagnosed in some systems. The radiometric capabilities of all cameras (except that the DSC W100 was replaced with a DSC T100 camera) were also evaluated and compared by carrying out modulation transfer function (MTF) analysis, image noise analysis and an operating range test. The geometric accuracy evaluation comprised an absolute accuracy test, JPEG test and temporal stability test. Geometric accuracy tests were carried out in order to evaluate their metric performances and to compare the results with respect to two off-the-shelf digital still video cameras (Sony DSC W100 and Sony DSC F828). For this purpose, two mobile phone cameras (Sony Ericsson K750i and Nokia N93) were calibrated over an indoor 3D testfield, using a self-calibrating bundle adjustment. This paper examines the potential of mobile phones to be used as front-end sensors for photogrammetric procedures and applications.
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