PPT-Linear filtering

Motivation Image denoising How can we reduce noise in a photograph Lets replace each pixel with a weighted average of its neighborhood The weights are called the filter kernel What are the weights for the average of a . Deep Packet Inspection. Artyom. . Churilin. Tallinn University of Technology 2011. Web filtering & DPI. Web filtering (content control) . is a way control . what content is permitted to a . user. . Overview of Filtering. Convolution. Gaussian filtering. Median filtering. Overview of Filtering. Convolution. Gaussian filtering. Median filtering. Motivation: Noise reduction. Given a camera and a still scene, how can you reduce noise?. Motivation: Image . denoising. How can we reduce noise in a photograph?. Let’s replace each pixel with a . weighted. average of its neighborhood. The weights are called the . filter kernel. What are the weights for the average of a . CS5670: Intro to Computer Vision. Noah Snavely. Hybrid Images, . Oliva. et al., . http://cvcl.mit.edu/hybridimage.htm. Lecture 1: Images and image filtering. Noah Snavely. Hybrid Images, . Oliva. et al., . Filtering Overview. Filter- To remove some components of an input and pass others. We will concentrate on Finite Impulse Response (FIR) filters. Different approaches to filtering. Hardware filters. Filtering by conversion to frequency domain. What is an image?. A grid (matrix) of intensity values. . (common to use one byte per value: 0 = black, 255 = white). =. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. 255. Prof. Kristen . Grauman. UT-Austin. …. Announcements. Office hours . Mon-Thurs 5-6 pm. Mon: Yong Jae, PAI 5.33. Tues/Thurs: Shalini, PAI 5.33. Wed: Me, ACES 3.446. cv-spring2011@cs.utexas.edu. for assignment questions outside of office hours. denoising. How can we reduce noise in a photograph?. Let’s replace each pixel with a . weighted. . average. of its neighborhood. The weights are called the . filter kernel. What are the weights for the average of a . Fouhey. Winter 2019, University of Michigan. http://web.eecs.umich.edu/~fouhey/teaching/EECS442_W19/. Note: I’ll ask the front row on the right to participate in a demo. All you have to do is say a number that I’ll give to you. If you don’t want to, it’s fine, but don’t sit in the front. . Fouhey. .. Let’s Take An Image. Let’s Fix Things. Slide Credit: D. Lowe. We have noise in our image. Let’s replace each pixel with a . weighted. average of its neighborhood. Weights are . filter kernel. Henning Lange, Mario . Bergés. , Zico Kolter. Variational Filtering. Statistical Inference. (Expectation Maximization, Variational Inference). Deep Learning. Dynamical Systems. Variational Filtering. 3. Filtering . Filtering image data. is a . standard process . used in almost all image processing systems. . Filters. are used to remove . noise. from digital image while keeping the details of image preserved. . Neighbourhood. Processing. Lecture 2(b). . Neighbourhood. Processing. We have seen . that . an image can be . modified . by applying a particular function to . each pixel value whereby this is known as point processing. . An introduction. CS578-Digital speech signal processing. Invited lecture. On the (Glottal) Inverse Filtering of Speech Signals. Introduction. Inverse Filtering Techniques. Conclusions. Introduction. On the (Glottal) Inverse Filtering of Speech Signals.