A technique used to approximate halftones without reducing spatial resolution is known as _________.
Dithering
Halftoning simulates intensity levels on a bilevel device by grouping pixels into n × n cells (halftone patterns) and switching on a varying number of dots in each cell. More grey levels are obtained, but each cell acts as one picture element, so the spatial resolution is reduced.
Dithering is the general name for techniques that approximate halftones without reducing resolution: each pixel keeps its own position, and the decision to turn it on is made by comparing its intensity with a threshold that varies from pixel to pixel (a dither matrix) or by adding noise.
Error diffusion is one particular dithering method (the quantisation error of a pixel is spread to its neighbours), so the general technique described is dithering.
Hence, the answer is Dithering.
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Given a simple image of size 10 × 10 whose histogram models the symbol probabilities and is given by
p1 p2 p3 p4 a b c d The first order estimate of image entropy is maximum when
A Butterworth lowpass filter of order n, with a cutoff frequency at distance D0 from the origin, has the transfer function H(u, v) given by
Given two spatial masks
\(S_1=\begin{bmatrix}0&1&0\\1&-4&1\\0&1&0\end{bmatrix}\) and \(S_2=\begin{bmatrix}1&1&1\\1&-8&1\\1&1&1\end{bmatrix}\)
The Laplacian of an image at all points (x, y) can be implemented by convolving the image with spatial mask. Which of the following can be used as the spatial mask ?
Blind image deconvolution is __________.
