Abstract
This paper aims to calibrate smartphone’s rear dual camera system which is composed of two lenses, namely; wide-angle lens and telephoto lens. The proposed approach handles large sized images. Calibration was done by capturing 13 photos for a chessboard pattern from different exposure positions. First, photos were captured in dual camera mode. Then, for both wide-angle and telephoto lenses, image coordinates for node points of the chessboard were extracted. Afterwards, intrinsic, extrinsic, and lens distortion parameters for each lens were calculated. In order to enhance the accuracy of the calibration model, a constrained least-squares solution was applied. The applied constraint was that the relative extrinsic parameters of both wide-angle and telephoto lenses were set as constant regardless of the exposure position. Moreover, photos were rectified in order to eliminate the effect of lens distortion. For results evaluation, two oriented photos were chosen to perform a stereo-pair intersection. Then, the node points of the chessboard pattern were used as check points.
Highlights
The rapid evolution of smartphones technology in the last few years directly impacted the smartphone’s embedded cameras
The majority of the smartphones come up with dual camera system. Calibrating this dual camera system facilitates the possibility of using smartphone in daily applications such as measuring dimensions of some piece of furniture, computing the internal dimensions of some room, recognizing the size of mechanical tools such as bolts and washers, and for several biomedical applications
Dual camera is a camera provided with two lenses that help in capturing photos
Summary
The rapid evolution of smartphones technology in the last few years directly impacted the smartphone’s embedded cameras. Most smartphones are provided with rear dual or multi camera system. The majority of the smartphones come up with dual camera system. Dual camera is a camera provided with two lenses that help in capturing photos. Many types of dual cameras can be found in the market. The type used by most manufacturers is the “Wide-Angle + Telephoto” type. This is the type of dual cameras utilized in this research. The “Wide-Angle + Telephoto” dual camera consists of two lenses: wide-angle lens and telephoto lens. The focal length of telephoto lens is longer than that of wide-angle one. Telephoto lens is used for differentiation between the background and foreground of the captured images (TechXplore, 2016)
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