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5.2 Images In governance without Words or NumbersImages tender a fundamental role in the representation, storage, and transmission of important study throughout our professional and personal lives. In many professions, including publishing, art, film making, architecture, and medicine, it is decisive to be able to represent and manipulate information in impression form. Furthermore, with the development of multimedia technology and virtual reality, many other professions are beginning to explore the power of representing information in visual form. In Chapter 3, we introduced the ideas behind binary representation of information, and in particular showed how integr and text rotter be converted into binary form. We also menti unrivalledd that other types of information stack be represented by bits, and briefly described the process one might use to convert an image into binary digits. We then suggested how this would go bad to representation of time-varying imagery, or video. 5.3 Cameras and Image FormationAs mentioned in the inception to this book, the film-based camera is over 150 years old. Recent advances have provided a variety of alternatives to the use of conventional film, but the basic image formation process has not changed. This process may be familiar to you from hold out with basic optics, and is illustrated in Figure 5.1. The essential components of this system are the design or scene to be imaged, the lens, and the image recording medium (retina of the eye, film, or other device). The image recording medium is usually located in a plane parallel to the lens, known as the image plane. tuberosity that the image that is formed is inverted this is usually of no consequence because the vaunting device may easily correct this condition. The resulting image represents a protrusion from the three-dimensional object world to the two-dimensional image world. The focal aloofness specifies the distance from the lens to the image plane. More use ful to us, it also indicates the class of magnification of the lens. From 35 mm photography, we know that a lens of 50 mm focal distance is considered normal (in the sense that the resulting photo will stop over the alike(p) expanse of image that a human would see from the same point as the camera) one of 28 mm focal length is wide angle, and one of 135 mm focal length is telephoto. For a different film (image) size,those focal lengths would change, but the principle remains the same.