List of top Image Processing and Analysis Questions asked in GATE Geomatics Engineering

The hue, intensity and saturation values for a pixel are \( H = 0.5 \, {rad} \), \( S = 0.5 \), and \( I = 0.3 \), respectively. If the pixel is converted to RGB color model, then the value of the green pixel would be __________ (rounded off to 2 decimal places).

The minimum and maximum Digital Number (DN) values of an image are 30 and 55, respectively. If the input DN value of a pixel is 35, the output DN value after linear contrast stretch of an 8-bit data is __________________ (in integer).
The overall image classification accuracy (in percentage) calculated from the following error matrix is __________________ (in integer).
Number of bytes required to store an 8-bit uncompressed image of size 512 × 512 pixels is __________________ (in integer).
For a given set of radiance values, which amongst the following is/are unitless?
Match the CORRECT option(s) for the types of filters given in (I), (II), (III), and (IV) with their kernels given in (P), (Q), (R), and (S).
The decorrelation stretch enhances colour differences and removes inter-band __________________.
Identify the CORRECT statement(s).
Choose the CORRECT statement(s).
Band ratio in satellite images interpretation is applied to
In case of Principal Component Analysis (PCA), the variance of a single variable expresses the spread of its values about the
In a Landsat-8 scene, digital number (DN) values of a pixel in band-4, band-5 and band-10 are 80, 100 and 30, respectively. What would be the NDVI value for the same pixel (round off to 3 decimal places)?
The sum of all the values of a normalized histogram is equal to __________________ (in integer).
Choose the INCORRECT statement about image segmentation in digital image processing.
Select the CORRECT sequence for supervised classification of satellite image.
(i) Classification
(ii) Training
(iii) Accuracy assessment
(iv) Radiometric/geometric correction
When the histogram of an image is non-Gaussian in nature, the type of linear contrast enhancement preferred to be used is
In a covariance matrix, the main diagonal shows the __________________ of each band.
The correlation coefficient between two bands of remote sensing data that would yield good classification is
Choose the CORRECT statement(s).
In surveying, an odometer is used for measuring
Number of cells required to cover an area of 9 sq. km of ASTER-GDEM are __________________ (in integer).
Choose the CORRECT statement(s) in case of visual image interpretation.
The spatial resolution of a satellite image \( P \) is 80 m and another satellite image \( Q \) is 20 m; each of 512 \(\times\) 512 pixel size. Choose the CORRECT option(s).
Which statement(s) is/are CORRECT for Hyperspectral images?
Choose the CORRECT statement(s)