Todays lecture Frequency spectrum of an image Explain the sampling of the 2 dimension image The second stage of the digitization process. In the first sampling and in the second quantization of each of the samp
Overview Mapping Resampling Forward Reverse Point sampling Triangle filter Gaussian filter kucg.korea.ac.kr This method is simple, but it causes aliasing Point Sampling Take value at closest pixel int iu = trunc(u+0.5); int iv = trunc(v+0.5); dst(x, y) = src(iu, iv); This method is...
1.Sensing,Sampling,Quantization 2.GraylevelandColorImages 3.Raw,RGB,Tiff,BMP,JPG,GIF,(JP2) ImageTransformandFiltering Histogram,EnhancementandRestoration Segmentation,EdgeDetection,Thinning ImageDataCompression ImagePatternAnalysis(RecognitionandInterpretation) ...
Chapter 2 Digital Image Fundamentals Outline: Elements of Visual perception Light and the Electromagnetic Spectrum Image Sensing and Acquisition Image Sampling and Quantization Some Basic Relationships Between Pixels Linear and Nonlinear Operation Elements of Visual Perception ...
and convolution 2.1.3 The Fourier transform 2.1.4 Images as a stochastic process 2.1.5 Images as linear systems 2.2 Image digitization 2.2.1 Sampling 2.2.2 Quantization 2.2.3 Color images 2.3 Digital image properties 2.3.1 Metric and topological properties of digital images 2.3.2 Histograms 2.3...
PPT: "PPT: Token Pruning and Pooling for Efficient Vision Transformers", arXiv, 2023 (Huawei). [Paper] MatFormer: "MatFormer: Nested Transformer for Elastic Inference", arXiv, 2023 (Google). [Paper] Conv + Transformer LeViT: "LeViT: a Vision Transformer in ConvNet's Clothing for Faster ...
CRT Monitor: non-linear relationship between the voltage and the resulting brightness is determined by gamma Pre-map the sensed luminance Y through an inverse gamma Gamma Compensation Noise added during transmission or quantization will be reduced in the darker regions of the signal where it was ...
Specialized measuring devices us 12 and more bits per pixel, although these are becoming more common. The result of sampling and quantization of continuous image is a matrix of real numbers. Spatial resolution is MxN pixels. Gray-level resolution is Each element of th 14、is matrix array is ...
Sampling and Quantization Image as Array of Pixels An image is a 2-d rectilinear array of pixels Pixels as samples A pixel is a sample of a continuous function What is an image? The bitmap representation Also called “raster or pixel maps” representation An image is broken up into a grid...
23 Sampling theory We can sample an image and reconstruct it without loss of quality if we can : Transform I(t) function from to freq. Domain Find the max frequency f max Sample I(t) at rate > 2 f max Store the sampled values in a bitmap 2f max is called Ny...