Subpixel rendering

About: Subpixel rendering is a research topic. Over the lifetime, 3885 publications have been published within this topic receiving 82789 citations.

Image analysis methods for solder ball inspection in integrated circuit manufacturing

Abstract: Machine vision methods are presented for the analysis of solder balls in integrated circuits. The algorithms are founded on counter fitting using a multiparameter Hough transform and on polynomial-classifier-based pattern recognition. The first method is used to show the complexity of the inspection problem, especially in the presence of high-precision requirements. In this connection, it is shown that subpixel accuracy is not obtainable even under the assumption of a perfect camera system which determines the resolution necessary for the measurement of a given maximum-volume distortion. The second method is carried out by computing a large number of features on the original image after individual solder balls are segmented by a projection technique. This approach can be considered as a control-free image segmentation paradigm, since it does not rely on properly sequencing several image-analysis modules. Further experimentation with a large pool of defective solder balls is necessary to confirm the applicability of these machine vision algorithms to a real-world manufacturing inspection systems. A general image-segmentation architecture is proposed, which enables the computation of the necessary low-level image features as well as pixel classification at video-rate speed. >

A Tensor Approach for Precise Computation of Dense Displacement Vector Fields

Abstract: Using the 3-dimensional structure tensor, dense displacement vector fields (DVF) can be computed with subpixel accuracy. The approach is based on the detection of linear symmetries and the corresponding orientation angle within a local spatio-temporal neighborhood. The proposed technique is well suited to be applied within a multiresolution framework in order to avoid corresponence problem errors. In this paper the implementation of the tensor approach will be introduced together with an error analysis. The performance of the technique will be proved with test sequences as well as with real scientific applications.

Non-contact laser inspection for the inner wall surface of a pipe

Abstract: A non-contact laser sensor based on the ring optical cutting image method to measure the size and profile of the inner wall of a pipe is developed. The sensor consists of a laser diode light source, an optical ring pattern generator and a CCD camera. The optical ring pattern from the optical ring pattern generator is projected onto the inner wall of the pipe, which is then viewed by the CCD camera. Reasonable parameters according to the theory of light scattering and reflection are chosen to simulate and optimize the measurement system. The adaptive weighted average value filter and the subpixel technique on several-step computing and half Gaussian fitting are deployed to obtain the edge and the centre of the ring image in order to filter the noise of the image and raise the resolution of the measurement system. The experimental results show that the principle is correct and the techniques are realizable.

A new simple and efficient antialiasing with subpixel masks

Abstract: Antialiasing of edges is often performed with the help of subpixel masks that indicate which parts of the pixel are covered by the object that has to be drawn. For this purpose, subpixel masks have...

13.4: Subpixel Image Scaling for Color Matrix Displays

Abstract: The apparent resolution of matrix displays is increased when the relative position of the color subpixels is taken into account. This paper shows that a general method to achieve this for any subpixel arrangement, can be incorporated in an image scaler at low additional cost, allowing simple quality trade-off control.