CSEL311 Flashcards
The computer is an __________
information processing machine
It is a tool for _______, ________, and _______ data.
storing, manipulating, correlating
It displays the information in the form of graphics objects like ____, ______, _____, and ______.
pictures, charts, graphs and diagrams
Computer graphics makes it possible to express data in ______
pictorial form
Pictures or graphics objects are presented as a collection of discrete picture elements called _______.
pixels
It is the smallest addressable screen element. It is the smallest piece of the display screen which we can control.
pixels
Thus we can say that computer graphics concerns the ___________ of real or imaginary objects.
pictorial synthesis
The image processing can be classified as (IE)
image enhancement
The image processing can be classified as (PDR)
pattern detection and recognition
The image processing can be classified as (SA & CV)
scene analysis and computer vision
It deals with the detection and clarification of standard patterns and finding deviations from these patterns.
pattern detection and recognition
Example of pattern detection and recognition
optical character recognition (OCR) technology
With ________, users can also control the animation by adjusting the speed, the portion of the total scene in view, the geometric relationship of the objects in the scene to one another, the amount of detail shown and so on.
interactive graphics
The interactive graphics provides a tool called _______. With this tool, user can move and tumble objects with respect to a stationary observer, or he can make objects stationary and the viewer moving around them.
motion dynamics
The interactive graphics also provides a facility called ________. With this, it is possible to change the shape, colour or other properties of the objects being viewed.
update dynamics
With the recent development of ____________(DSP) and ________, the interactive graphics can now provide audio feedback along with the graphical feedbacks to make the simulated environment even more realistic.
digital signal processing, audio synthesis chip
Pictures found on the Web and photos you import from your digital camera are ________
raster graphics
Raster graphics are made up of a grid of pixels, commonly referred to as ______. The larger it is, the bigger the size.
bitmap
Raster graphics can typically be scaled down with no loss of quality, but enlarging a bitmap image causes it to look _____ and ________
blocky and pixelated
________ are often used for certain images, such as company logos, which need to be scaled to different sizes.
vector graphics
Making use of sequential commands or mathematical statements or programs which place lines or shapes in a 2-D or 3-D environment is referred to as ___________
vector graphics
The main difference between vector and raster graphics is that raster graphics are composed of ______, while vector graphics are composed of _____
pixels, paths
A ______ ______, such as a gif or jpeg, is an array of pixels of various colours, which together form an image.
raster graphic
Similar to the naive line-drawing algorithm, with minor variations.
Digital Differential Analyzer (graphics algorithm)
Optimized to use only additions (i.e. no divisions or multiplications); it also avoids floating-point computations.
Bresenham’s line algorithm
_______ polygon has no interior angle greater than 180° (it has no inward-pointing sides).
convex
_______ polygon has at least one interior angle greater than 180°. It must have at least 4 sides.
concave
______ polygon encloses a single interior space (boundary) and does not have self-intersecting sides
simple
_______ polygons have self-intersecting sides
complex
An _________ polygon does not have congruent sides and interior angles.
irregular
A _______ polygon has congruent sides and interior angles.
regular
_______ is a representation of the surface. It is primitive which is closed in nature. It is formed using a collection of lines. It is also called a many-sided figure.
polygon
The lines combined to form polygons are called _____ or _____.
sides or edges
The lines of a polygon are obtained by combining two ________.
vertices
The polygon edges are being intersected with the scanline.The polygon is filled with colours in between the intersecting pairs.
Scan-Line Algorithm
Fill colour option is used rather than on the object boundary. Fill clour replaces the interior colour. The pixels are filled by using either Four-connect or Eight-connect method.
Flood Fill Algorithm
A point inside an object is picked and is filled until the boundary is hit by the object. This algorithm works only when the colour of the boundary is different from the colour that is used for filling.
Boundary Fill Algorithm
The pixels are used by placing them on four different sides of the current pixel till a different colour boundary is identified.
4-Connected Polygon
8-connected pixels are used in this technique by adding the pixels above, below, right and left side of the current pixels. The pixels are fixed diagonally such that the complete area of the current pixel is covered. The process is continued till a boundary is found with different colour.
8-Connected Polygon
