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A new approach to camera calibration is proposed in this paper. If the camera observes a scene plane including more than one rectangle at the different unknown directions, all the five intrinsic parameters can be determined linearly by this proposed method. Experimental results from simulated data and real images show that the proposed method is accurate and robust. Because the constraint equations...
A new 3D reconstruction method based on image dense stereo matching is proposed in this paper. Firstly, the feature-points of stereo images must be extracted by SIFT algorithm and they are matched through similarity constraints. The second step is to select seed points which determine the performance of the algorithm and then we can do dense matching with these seed points. Afterward, the false matches...
A dual color image blind watermarking algorithm is proposed based on block Discrete Cosine Transformation (DCT). Firstly, the original watermark image and the original host image in RGB color space are converted to YCbCr color space, and the block DCT is implemented on their Y, Cb and Cr layer respectively. Secondly, the low frequency coefficients of each quantization sub-block of the watermark image...
A fully automatic 3D reconstruction method based on images without manual modeling is presented in this paper. The method extracts 3D information from 2D images directly. Firstly, the feature points must be extracted from the images and then we match these corresponding points. Secondly, to determine the coordinates of 3D points, we should calculate the fundamental matrix, along with the extrinsic...
Camera autocalibration from Kruppapsilas equations must solve the problem of finding the global minimum of a cost function which has many local minima. Due to the drawbacks of the traditional optimization algorithms in camera calibration, which include initial value sensitiveness, pool convergence and easily plunging into local minima, we study the application of the particle swarm optimization algorithm...
In 3d reconstruction, to search the corresponding points only in horizontal line rapidly and accurately, it is used to make the epipolar lines of stereo images be parallel to the horizontal direction and to remove the parallax in vertical direction, then we can complete the density match better. In the foundation traditional projective transform, a novel liner and aspect ratio invariant rectification...
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