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Important WBUT PYQs on Image Processing

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✅ WBUT 5-Mark Questions (Short Answer Type) - Frequency >= 3

  1. Distinguish between image enhancement and image restoration. What is the equation for getting a negative image? / What are image negatives? / Contrast stretching.

    • Frequency: 7 (WBUT 2009, 2012, 2015, 2017, 2019) - (Image Enhancement Q2, Q3; Image Restoration Q3c)

  2. Write short notes on: a) Optimum Thresholding b) Edge detecting operations c) Split and Merge Algorithm.

    • Frequency: 5 (WBUT 2009, 2012, 2014, 2017, 2019) - (Image Segmentation Q6)

  3. Explain bilinear interpolation method for image zooming.

    • Frequency: 3 (WBUT 2011, 2014, 2015) - (Introduction Q4)

  4. Write down the key stages in Digital Image Processing & explain them.

    • Frequency: 3 (WBUT 2013, 2016, 2017) - (Introduction Q7)

  5. What is 8 bit colour image? For what purpose could it be used?

    • Frequency: 3 (WBUT 2013, 2016, 2018) - (Introduction Q8)

  6. Explain Unsharp masking and High boost filtering. Write the expression of Laplacian operator for an image of two variables.

    • Frequency: 3 (WBUT 2011, 2014, 2015) - (Image Enhancement Q7)

  7. What are called median filters? / Explain the operation of median filter.

    • Frequency: 3 (WBUT 2009, 2011, 2014, 2017) - (Image Enhancement Q1, Q8)

  8. What is salt and pepper noise? What is Gaussian noise?

    • Frequency: 3 (WBUT 2012, 2013, 2014) - (Image Enhancement Q14)

  9. What is the difference between lossy and lossless compression?

    • Frequency: 3 (WBUT 2012, 2013, 2014) - (Image Data Compression Q2)

✅ WBUT 15-Mark Questions (Long Answer Type) - Frequency >= 3

  1. What is Hough transform and where is it used? / Discuss the global processing via the Hough transform. Explain the role of Discrete cosine transform in image processing.

    • Frequency: 7 (WBUT 2011, 2014, 2015, 2013, 2012) - (Mathematical Preliminaries Q5 (Short/Long)) & (WBUT 2011, 2014) - (Mathematical Preliminaries Q1)

  2. Explain the data redundancy and compression ratio of an imaging system. / What do you mean by redundancy and compression ratio? How many types of data redundancy...? Explain lossless and lossy predictive coding. / Why image compression is required? / Take any 4x4 gray image of your choice and show how block truncation coding can be applied... Classify different type of redundancies...

    • Frequency: 7 (WBUT 2009, 2012) - (Image Data Compression Q1, Q2) & (WBUT 2014, 2018) - (Image Data Compression Q5/6) & (WBUT 2015, 2016) - (Image Data Compression Q7)

  3. What do you mean by global and local thresholding? What is the basic difference between region growing and split merge technique? / Describe the region growing technique for image segmentation... / Explain the process of region extraction based on segmentation.

    • Frequency: 7 (WBUT 2011, 2013, 2015) - (Image Segmentation Q2) & (WBUT 2012, 2017, 2014) - (Image Restoration Q3) & (WBUT 2016) - (Image Segmentation Q3)

  4. Write short notes on: a) Morphology b) Hit-or-miss Transform c) Erosion and Dilation d) Chain code.

    • Frequency: 6 (WBUT 2009, 2014, 2017, 2015, 2016, 2018) - (Morphological Image Processing Q4)

  5. What do you mean by image negative? Explain. b) Explain intensity slicing with example. c) Why do we need Log Transformation in dynamic range compression?

    • Frequency: 4 (WBUT 2012, 2013, 2017, 2019) - (Image Enhancement Q5)

  6. What is Histogram of an image and why is it used for image processing? What do you mean by Histogram equalization? OR, What do you understand by the terms 'histogram' and 'histogram equalization'? / What is Histogram of an image and why processing? What do you mean by Histogram specification? / Image averaging, Histogram characteristics for dark, bright, low contrast images. Equalize the following histogram.

    • Frequency: 4 (WBUT 2011, 2016) - (Image Enhancement Q4) & (WBUT 2012) - (Image Enhancement Q6) & (WBUT 2015) - (Image Enhancement Q7)

  7. Write short notes on: a) Colour image processing b) Brightness adaptation c) Weber ratio.

    • Frequency: 4 (WBUT 2011, 2014, 2017, 2018) - (Introduction Q1)

  8. Write short notes on: a) Fourier descriptor b) DCT c) Hadamard transform d) Walsh Transform.

    • Frequency: 4 (WBUT 2009, 2011, 2014, 2016) - (Mathematical Preliminaries Q4)

  9. If an image is rotated by an angle pi/4, will there be any change in the histogram of that image? Justify your answer.

    • Frequency: 3 (WBUT 2015, 2017, 2019) - (Digital Image Formation Q5)

  10. What is unitary transform? Define and compute the equations for unitary transform for both 1-D and 2-D image.

    • Frequency: 3 (WBUT 2014, 2018, 2019) - (Mathematical Preliminaries Q2)

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