# Recent questions and answers in Digital Image Processing

1 vote
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Given a simple image of size $10 \times 10$ whose histogram models the symbol probabilities and is given by $P_{1}$ $P_{2}$ $P_{3}$ $P_{4}$ a b c d The first order estimate of image entropy is maximum when $a = 0, b = 0, c = 0, d = 1$ $a=\frac{1}{2}, b=\frac{1}{2}, c=0, d=0$ $a=\frac{1}{3}, b=\frac{1}{3}, c=\frac{1}{3}, d=0$ $a=\frac{1}{4}, b=\frac{1}{4}, c=\frac{1}{4}, d=\frac{1}{4}$
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Given an image of size $1024 \times 1024$ pixels in which intensity of each pixel is an $8$-bit quality. It requires _______ of storage space if the image is not compressed. One Terabyte One Megabyte $8$ Megabytes $8$ Terabytes
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Consider the conditional entropy and mutual information for the binary symmetric channel. The input source has alphabet $X=\{0,1\}$ and associated probabilities ${\dfrac{1}{2}, \dfrac{1}{2}}$. The channel matrix is $\begin{pmatrix} 1-p & p \\ p & 1-p \end{pmatrix}$ wgere p is the transition probability. Then ... is given by: $1$ $-p \log(p)-(1-p) \log(1-p)$ $1+p \log(p)+(1-p) \log(1-p)$ $0$
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Which of the following is not an image type used in MPEG? A frame B frame D frame P frame
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If the frame buffer has 8 bits per pixel and 8 bits are allocated for each of the $R, G, B$ components, what would be the size of the lookup table? $24$ bytes $1024$ bytes $768$ bytes $256$ bytes
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Which of the following is used for the boundary representation of an image object? Quad Tree Projections Run length coding Chain codes
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In an image compression system 16384 bits are used to represent 256 $\times$ 256 image with 256 gray levels. What is the compression ratio for this system? 1 2 4 8
1 vote
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The quantiser in an image-compression system is a lossy element which exploits the psychovisual redundancy lossless element which exploits the psychovisual redundancy lossy element which exploits the statistical redundancy lossless element which exploits the statistical redundancy
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[closed]
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Which of the following compression algorithms is used to generate a .png file? LZ78 Deflate LZW Huffman
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What does a pixel mask mean? string containing only 1's string containing only 0's string containing two 0's string containing 1's and 0&rsquo;s
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IMAGE
[closed]
If the Fourier transform of the function f(x,y) is F(m,n), then the Fourier transform of the function f(2x,2y) is $\frac{1}{4} F (\frac{m}{2}, \frac{n}{2})$ $\frac{1}{4} F (2m, 2n)$ $\frac{1}{4} F (m,n)$ $\frac{1}{4} F (\frac{m}{4}, \frac{n}{4})$