Computer Knowledge

Digital Image Processing

2,103 Questions

Digital image processing involves manipulating digital images through various algorithms to enhance their visual quality or extract information. Key concepts include noise reduction, high dynamic range imaging, color correction, and sharpening techniques. These concepts are essential for computer science exams and technical certifications.

Color management systemsNoise reduction techniquesHDR image combiningImage sharpening techniquesAlpha matting process

Digital Image Processing Questions

Multiple choice

PC video cameras digitize images by breaking them into individual

  1. pixels

  2. barcodes

  3. waves

  4. both (1) and (2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Digital cameras and video devices capture images by dividing the visual field into a grid of tiny points called pixels. Each pixel stores color and brightness information, which the computer then uses to reconstruct the image. This process is fundamental to all modern digital imaging.

Multiple choice

Bitmap images are also called _____ images.

  1. Graphic

  2. RGB

  3. Raster

  4. Colour
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bitmap images are composed of a grid of pixels and are commonly referred to as raster images. Unlike vector images, which use mathematical paths, raster images lose quality when scaled up.

Multiple choice

__________ changes the degree of hue in an image.

  1. Saturation

  2. Contrast

  3. Brightness

  4. Diversity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Saturation refers to the intensity or purity of a color (hue) in an image. Increasing saturation makes colors more vivid, while decreasing it moves the image toward grayscale.

Multiple choice

Undoing or eliminating distortions and blurring caused by the instrumentation in digital image processing techniques to process, analyse and present images obtained from a microscope is called

  1. convolution

  2. deconvolution

  3. cryogenic

  4. CCD

  5. frame grabber
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Deconvolution – it is a undoing process of convolution. This eliminates distortions and blurring caused by the instrumentation in digital image processing techniques to process, analyse and present images obtained from a microscope.

Multiple choice

Panoramic, the most advanced digital microscopic imaging system uses

  1. the Analysis image techniques

  2. 2D and 3D tiling image techniques

  3. 3D image techniques

  4. CCD image techniques

  5. 2D image techniques
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

2D and 3D tiling, also known as stitching or creating a panoramic, can now be done with the more advanced digital microscope systems. 

Multiple choice physics motion and measurement measuring length measurement of small and large distances measurement of distance

Parallax method is based on which of the following principle?

  1. Disparity

  2. Lutz Kelker bias

  3. Trilateration

  4. Triangulation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Distance measurement by parallax is a special case of the principle of triangulation, which states that one can solve for all the sides and angles in a network of triangles if, in addition to all the angles in the network, the length of at least one side has been measured. Thus, the careful measurement of the length of one baseline can fix the scale of an entire triangulation network. In parallax, the triangle is extremely long and narrow, and by measuring both its shortest side (the motion of the observer) and the small top angle (always less than 1 arcsecond leaving the other two close to 90 degrees), the length of the long sides can be determined.

Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

Huygen's concept of wavelets is useful in

  1. explaining polarisation

  2. determining focal length of lenses

  3. determining chromatic aberration

  4. geometrical reconstruction of a wavefront
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Huygens considered that light was propagated in longitudinal waves.
Huygen's concept explained the direction of propagation of light waves by geometrical reconstruction of wavefront.