II. DIGITAL IMAGES ANALYSIS AND PROCESSING
A digital image is a representation of a two-dimensional
image, defined as a finite set of digital values, named image
elements or pixels. The digital image consists of a fixed number of pixel lines and columns. Pixels represent the
smallest informational units of an image (usually associated
with small dots) which contain quantifiable values for
brightness and for the image dots. Normally, pixels are
stored in memory as a two-dimensional matrix of integer
values of type small. These values are sent or stored in a
compressed way.
Each pixel in an image is associated to a specific
position in a two-dimensional area. It has a specific numeric
value quantifying the image features (brightness, grey
shades or color information) that define the corresponding
image dot. Therefore, the digital images may be classified
according to the number and the nature of these samples:
binary, grayscale, false-color, multi spectral, thematic,
graphical functions.
Even if the term “texture” refers to the properties
belonging to the external surfaces of the objects and to the
sensations induced by touch, it is sometimes used to
describe non-tactile sensations. Also, the textures may
represent sub-dimensioned models (especially in case of
non-tactile two-dimensional textures), where the individual
elements are placed one next to the other, in order to
generate undistinguishable models.
Color may be an integral part of the texture’s model, or it
may be applied separately. In this case, a repetitive model of
the texture may be used in a number of ways in computer
graphics: green for grass, blue for water, grey for concrete,
dark grey for nocturnal images, etc
II. DIGITAL IMAGES ANALYSIS AND PROCESSINGA digital image is a representation of a two-dimensionalimage, defined as a finite set of digital values, named imageelements or pixels. The digital image consists of a fixed number of pixel lines and columns. Pixels represent thesmallest informational units of an image (usually associatedwith small dots) which contain quantifiable values forbrightness and for the image dots. Normally, pixels arestored in memory as a two-dimensional matrix of integervalues of type small. These values are sent or stored in acompressed way.Each pixel in an image is associated to a specificposition in a two-dimensional area. It has a specific numericvalue quantifying the image features (brightness, greyshades or color information) that define the correspondingimage dot. Therefore, the digital images may be classifiedaccording to the number and the nature of these samples:binary, grayscale, false-color, multi spectral, thematic,graphical functions.Even if the term “texture” refers to the propertiesbelonging to the external surfaces of the objects and to thesensations induced by touch, it is sometimes used todescribe non-tactile sensations. Also, the textures mayrepresent sub-dimensioned models (especially in case ofnon-tactile two-dimensional textures), where the individualelements are placed one next to the other, in order togenerate undistinguishable models.Color may be an integral part of the texture’s model, or itmay be applied separately. In this case, a repetitive model ofthe texture may be used in a number of ways in computergraphics: green for grass, blue for water, grey for concrete,dark grey for nocturnal images, etc
การแปล กรุณารอสักครู่..
