tailieunhanh - Xử lý hình ảnh thông minh P4

The EyeTap glasses of the previous chapter absorb and quantify rays of light, process these rays of light, and then resynthesize corresponding rays of light. Each synthesized ray of light is collinear with, and responsive to, a corresponding absorbed ray of light. The exact manner in which it is responsive is the subject of this chapter. In other words, this chapter provides meaning to the word “quantify” in the phrase “absorb and quantify. | Intelligent Image Processing. Steve Mann Copyright 2002 John Wiley Sons Inc. ISBNs 0-471-40637-6 Hardback 0-471-22163-5 Electronic 4 COMPARAMETRIC EQUATIONS QUANTIGRAPHIC IMAGE PROCESSING AND COMPARAGRAPHIC RENDERING The EyeTap glasses of the previous chapter absorb and quantify rays of light process these rays of light and then resynthesize corresponding rays of light. Each synthesized ray of light is collinear with and responsive to a corresponding absorbed ray of light. The exact manner in which it is responsive is the subject of this chapter. In other words this chapter provides meaning to the word quantify in the phrase absorb and quantify. It is argued that hidden within the flow of signals from typical cameras through image processing to display media is a homomorphic filter. While homomorphic filtering is often desirable there are some occasions when it is not. Thus cancellation of this implicit homomorphic filter is proposed through the introduction of an antihomomorphic filter. This concept gives rise to the principle of photoquantigraphic image processing wherein it is argued that most cameras can be modeled as an array of idealized light meters each linearly responsive to a semimonotonic function of the quantity of light received and integrated over a fixed spectral response profile. This quantity called the photoquantigraphic quantity is neither radiometric nor photometric but rather depends only on the spectral response of the sensor elements in the camera. A particular class of functional equations called comparametric equations is introduced as a basis for photoquantigraphic image processing. Comparametric equations are fundamental to the analysis and processing of multiple images differing only in exposure. The well-known gamma correction of an image is presented as a simple example of a comparametric equation for which it is shown that the underlying photoquanti-graphic function does not pass through the origin. For this reason it is argued that .

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