10 Questions
Match the following terms with their descriptions based on the digital image processing lecture:
Image Acquisition = Generated by illuminating a scene and absorbing the reflected energy Digital Image = Sampling, quantisation, and representation Image Formation = Includes the geometry of image formation and the physics of light Pinhole Camera = The simplest device to form an image of a 3D scene
Match the examples with the correct image acquisition methods:
X-rays of a skeleton = Illumination and scene can be way off Ultrasound of an unborn baby = Illumination and scene can be way off Electro-microscopic images of molecules = Illumination and scene can be way off
Match the following components of image formation with their descriptions:
Geometry of image formation = Determines where in the image plane the projection of a point in the scene will be located Physics of light = Determines the brightness of a point in the image plane as a function of illumination and surface properties
Match the image acquisition process with its description:
Illumination = Lighting up a scene Absorbing energy = Capturing the energy reflected by the objects in the scene
Match the term with the correct process in digital image processing:
Spatial resolution = Part of image representation Intensity resolution = Part of image representation Digital Video = Has its own properties
Explain the two parts of the image formation process and their respective roles.
The two parts of the image formation process are the geometry of image formation and the physics of light. The geometry determines where in the image plane the projection of a point in the scene will be located, while the physics of light determines the brightness of a point in the image plane based on illumination and surface properties.
What is the purpose of image acquisition in digital image processing?
The purpose of image acquisition is to generate images by illuminating a scene and capturing the energy reflected by the objects in that scene.
What are some examples of images that can be generated through image acquisition?
Some examples of images that can be generated through image acquisition include X-rays of a skeleton, ultrasound images of an unborn baby, and electro-microscopic images of molecules.
What is a pinhole camera and how does it form an image?
A pinhole camera is the simplest device used to form an image of a 3D scene. It works by allowing light to pass through a small hole (pinhole) and project an inverted image of the scene onto a surface.
Name the book from which the images in the lecture were taken.
The images in the lecture were taken from the book 'Digital Image Processing' by Gonzalez & Woods (2002).
Study Notes
Image Acquisition and Formation
- Image acquisition is the process of capturing an image using various devices such as cameras, scanners, or sensors.
- The purpose of image acquisition is to capture an image in a digital format that can be processed and analyzed.
Image Formation Process
- The image formation process consists of two parts: optical imaging and detection.
- Optical imaging involves the projection of light onto a sensing device through the lens and aperture of a camera.
- Detection involves the conversion of light into electrical signals by the sensing device.
Image Acquisition Methods
- Passive sensing: uses natural light reflected from the object, e.g. photography, videography, and satellite imaging.
- Active sensing: uses artificial light or energy sources, e.g. radar, lidar, and sonar.
Components of Image Formation
- Illumination: the source of light used to illuminate the object.
- Object: the scene or object being imaged.
- Optical system: the lens, aperture, and other components that focus light onto the sensing device.
- Sensing device: converts light into electrical signals, e.g. CCD (charge-coupled device) or CMOS (complementary metal-oxide-semiconductor).
Pinhole Camera
- A pinhole camera is a simple camera that uses a small aperture to project an inverted image onto a sensing device.
- The pinhole camera forms an image through the principle of geometric optics, where light rays pass through the pinhole and intersect at the sensing device.
Examples of Acquired Images
- Photographs
- Medical images (e.g. MRI, CT scans)
- Satellite images
- Microscopic images
Lecture References
- The lecture images were taken from the book "Digital Image Processing" by Gonzalez and Woods.
Test your knowledge on image acquisition, formation, and sensing with this quiz. Explore topics such as digital images, sampling, quantization, image representation, spatial and intensity resolution, and digital video properties. Challenge yourself with questions based on the content from Gonzalez & Woods' Digital Image Processing book.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
