al bovik - the essential guide to image processing 2009. elsevier

[...]... students to test the image processing concepts on their own Toward this end, the SIVA demos are much more than simple image processing subroutines They are user-friendly programs with attractive graphical user interfaces, with button- and slider-enabled selection of the various parameters that control the algorithms, and with before-and-after image windows that show the visual results of the image processing. .. false pattern) Aliasing, and its mathematical interpretation, will be discussed further in Chapter 2 in the context of the Sampling Theorem 1.6 QUANTIZED IMAGES The other part of image digitization is quantization The values that a (single-valued) image takes are usually intensities since they are a record of the intensity of the signal incident on the sensor, e.g., the photon count or the amplitude... being rather theoretical Although many of these mathematical topics may be unfamiliar (and often superfluous) to a majority of the general image processing audience, we believe it is possible to present the theoretical aspects of image processing as an intuitive and exciting “visual” experience Surely, the cliché “A picture is worth a thousand words” applies very effectively to the teaching of image processing. .. Introduction to Digital Image Processing become possible to acquire images of objects as small as 10Ϫ10 m Hence we are able to image from the grandest scale to the minutest scales, over a range of 40 orders of magnitude, and as we will find, the techniques of image and video processing are generally applicable to images taken at any of these scales Scale has another important interpretation, in the sense... an image and other images or a constant; – perform frequency processing and other tasks on images; convert an image from the spatial domain to the frequency domain using a 2D Fast Fourier Transform (FFT) and convert an image from the frequency domain to the spatial domain using the inverse FFT These VIs also extract the magnitude, phase, real, and imaginary planes of the complex image Can be used to. .. 1.12 depicts a 10 ϫ 10 digital image as a stack of B bit planes Special-purpose image processing algorithms are occasionally applied to the individual bit planes 1.7 COLOR IMAGES Of course, the visual experience of the normal human eye is not limited to grayscales— color is an extremely important aspect of images It is also an important aspect of digital images In a very general sense, color conveys a... in an image, invert the values in an image, and segment the image; – filter images to enhance the information in the image Use these VIs to smooth your image, remove noise, and find edges in the image You can use a predefined filter kernel or create custom filter kernels; – perform basic morphological operations, such as dilation and erosion, on grayscale and binary images Other VIs improve the quality... undergraduate image and video processing course as an in-class demonstration tool to illustrate the concepts and algorithms of image processing The demos have also been seamlessly integrated into the class notes to provide contextual illustrations of the principles being discussed Thus, they play a dual role: as in-class live demos of image processing algorithms in action, and as online resources for the students... digital image acquisition device Many people are familiar with the process of resizing a digital image to a smaller size (for the purpose of emailing photos or uploading them to social networking or photography Web sites) While a thorough mathematical analysis of these operations is rather 31 32 CHAPTER 2 The SIVA Image Processing Demos FIGURE 2.3 The Performance Meter inside NI Vision Assistant allows... 5) Supposing that the signal is part of an image, e.g., is a single scan-line of an image displayed on a monitor, then the visual quality may or may not be reduced in the sampled version Of course, the concept of visual quality varies from person -to- person, and it also depends on the conditions under which the image is viewed, such as the viewing distance Note that in Fig 1.6 the samples are indexed . has to view the latest space telescope images or read about the newest medical image modality to be aware of this. With this introduction,welcome to The Essential Guide to Image Processing! The. both cases, all three scales of images are digital, and so there is potential loss of information relative to the original analog image. However, the per- ceptual quality of the images can easilybe. emis- sions. In images of this type, the information to be had is often primarily internal to the object; the image may reveal how the object creates radiation and thence something of the internal