Basic knowledge of digital image
Digital image primarily refers to the visual data captured, processed, and represented as binary numbers, facilitating the electronic transmission and reception of visual information.
Definition of digital image
Digital images are binary representations of visual information, captured and stored as discrete pixel values corresponding to color and intensity.
Importance
Visually derived information constitutes 75% of human communication, making digital images central to technologies like smartphones and AI.
Acquisition and nature
Digital image acquisition involves capturing light from objects, similar to human vision, and includes sampling and quantization processes.
Image features
These are descriptive attributes that capture the content of an image, categorized into natural, artificial, internal, and external features.
Feature hierarchy model
This model consists of three layers: physical perception, logical semantics, and abstract semantics, facilitating image recognition.
Feature processing
Involves extracting, selecting, and expressing features to reduce dimensionality and enable computational analysis.
Applications
Digital image features are used in applications like automated classification of products, quality control, banknote recognition, and biometric identification, allowing for accurate object classification.
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