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This paper proposes a panoramic image mosaic system for mobile devices. The proposed panoramic mosaic system is optimized for mobile devices by integer-programmable algorithms, and is user-friendly designed by 4-directional auto-shot interface. The proposed system consists of image acquisition by auto-shot interface, image transform onto cylindrical mosaic surface, luminance and color compensation, local alignment, image stitching, and blending. The images are automatically captured by the auto-shot interface which senses the user's camera motion and takes a picture when the camera motion is matched to the predefined motion model of images. The captured images are transformed and projected onto a cylindrical mosaic surface. Exposure difference is removed by color compensation, and the projected images are locally aligned by translational motion model. Then, the boundary of overlapped images are determined and synthesized by image stitching and blending. According to the experiments using real mobile devices, the proposed mosaic system shows good performance compared with other mosaic algorithms. Especially, since the proposed mosaic system operates on the usual mobile multimedia in real-time, the users can generate panoramic images easier than the personal computer based algorithms (1). Index Terms--Panoramic image mosaic, auto-shot interface, motion estimation, integer programming