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 ...
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 samples. Optimum mean square error or Lloyd-max quantizer. Designing of an optimum quanti...
How Sampling and Quantization process affect the visual quality and date volume of an image? 7.试举出常用三种图像灰度映射规则并绘出相应映射曲线。(Please give three common gray-level mapping functions and their figure respectively 8.为什么一般情况下对离散图像直方图均衡化并不能产生完全平坦直方 图?(...
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 ...
OutlineForImageProcessing•ADigitalImageProcessingSystem•ImageRepresentationandFormats1.Sensing,Sampling,Quantization2.GraylevelandColorImages3.Raw,RGB,Tiff,BMP,JPG,GIF,(JP2)•ImageTransformandFiltering•Histogram,EnhancementandRestoration•Segmentation,EdgeDetection,Thinning•ImageDataCompression•ImagePatte...
An image is a two-dimensional function f(x,y), where x and y are spatial co-ordinates and the amplitude of f is the intensity of the image. If f, x and y are finite, discrete quantities then the image is a digital image. The elements of a digital image are usually referred to ...
图形科学英文版课件IMAGE (7).ppt,NCuts: Overall Procedure Construct a weighted graph G=(V,E) from an image. Connect each pair of pixels, and assign graph edge weights, Solve for the smallest few eigenvectors. This yields a continuous solution. Threshold e
(oftenthermal) •Digitizationprocess –Samplingandquantization •Transmission •Environment 1/8/20156 Noisemodels •Whitenoise:autocorrelationisanimpulse •Colorednoise •Usuallyassumethatnoiseisuncorrelated withtheimage •Gaussian:circuitnoise,illumination, environment(thermal) •Rayleigh:rangeimaging ...
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...
Digital Image Processing & Analysis Fall Outline Sampling and Quantization Image Transforms Discrete Cosine Transforms Image Operations Image Restoration. Computer Graphics & Image Processing Lecture 1 Introduction. Dr. Engr. Sami ur Rahman Digital Image Processing Lecture 1: Introduction. Digital Image...