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Joshua Dean Lab 06: Digital Images: A/D and D/A February 28, 2011 The George Washington University School of Engineering and Applied Science ECE 3220 Digital Signal Processing Lab Section 30 GTA: Damon Conover 95/100 3.1 Down-Sampling [25/25] Describe how the aliasing appears visually. Compare the original to the downsampled image. Which parts of the image show the aliasing effects most dramatically? Use the Sampling Theorem in your explanation. 3.2 Reconstruction of Images [15/20] Explain what values are contained in the indexing vector nn. What is the interpolation factor ? [25/25] Create and store a downsampled lighthouse image. Copy the rows and columns of the image to produce an image that is the same size as the original image. Display the resulting image, and compare it to the downsampled image (size and content). [30/30] Carry out a linear interpolation operation on the rows and columns of the down-sampled lighthouse image. Compare the interpolated image to the original image. Comment on the visual appearance of the interpolated image versus the original (differences and similarities). Can the reconstruction process remove the aliasing effects from the down-sampled image? Compare the quality of the linear interpolation result to the zero-order hold result. Point out regions where they differ and try to justify this difference by estimating the local frequency content. Introduction
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Lab 06: Digital Images: A/D and D/A introduced digital images along with Analog- Digital sampling and Digital-Analog reconstruction. Throughout the lab, various methods of sampling and reconstruction were performed, while subsequent analysis of the quality of each resulting image was compared with others. All of the operations were performed on MATLAB. The lab manual gave instruction on the conceptual A/D and D/A analysis techniques and then gave opportunity to utilize the techniques. An image of a lighthouse was used. It was first down sampled by a factor of two ( this means that in the memory, there were half as many data points as the unaltered image), and then down sampled by 3. Each image was reconstructed and compared with the original.
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