Digital Image Warping by George Wolberg

By George Wolberg

This best-selling, unique textual content specializes in photo reconstruction, real-time texture mapping, separable algorithms, two-pass transforms, mesh warping, and lighting tricks. The textual content, containing all unique fabric, starts off with the historical past of the sector and keeps with a assessment of universal terminology, mathematical preliminaries, and electronic picture acquisition. Later chapters speak about equations for spatial details, interpolation kernels, filtering difficulties, and fast-warping thoughts in response to scanline algorithms.

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The electric potential is read from the CCD in a process known as bucket brigade due to its resemblance to shift registers in computer logic circuits. The first potential well on each line is read out. Then, the electric potential along each line is shifted by one position. Note that connections between capacitors along a line permit charge to shift from element to element along a row. The read—shift cycle is then repeated until all the potential wells have been shifted out of the monolithic array.

Somewhat better quality is achieved with the SECAM and PAL systems. Although they also bandlimit chrominance, they both use 625 lines per frame, 25 frames per second, and 2:1 line interlacing. 38 PRELIMINARIES In recent years, many devices have been designed to digitize video signals. The basic idea of video digitizers involves freezing a video frame and then digitizing it. Each NTSC frame contains 482 visible lines with 640 samples per line. This is in accord with the standard 4:3 aspect ratio of the screen.

12) to compute the output for our discrete input f (x) and impulse response h (x) at only a limited set of values for x. If the impulse response is itself an impulse, then the filter is ideal and the input will be untampered at the output. That is, the convolution integral in Eq. 11) reduces to the sifting integral in Eq. 10) with h(x) being replaced by 50:). In general, though, the impulse response extends over neighboring samples; thus several scaled values may overlap. When these are added together, the series of sums forms the new filtered signal values.

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