Image preprocessing

Full Title

Arrangements for image or video recognition or understanding > Image preprocessing

Classification Context

Section:

PHYSICS

Class:

COMPUTING OR CALCULATING; COUNTING

Subclass:

IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

Scope Notes

Glossary: DCT discrete cosine transform FFT fast Fourier transform FOV field of view, the region of the environment that an image sensor observes. ROI region of interest, an image patch that is likely to contain relevant information. skeletonisation process of shrinking a shape to a connected sequence of lines, which are equidistant to the boundaries of the shape. SNR signal-to-noise ratio VOI volume of interest, a cuboid that encloses three-dimensional [3D] data points that are likely to represent relevant information | Application references: Recognising scenes; Scene-specific elements Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition Image or video recognition or understanding of human-related, animal-related or biometric patterns in image or video data

Child Classifications

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• G06V 10/22 by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition
• G06V 10/24 Aligning, centring, orientation detection or correction of the image
• G06V 10/25 Determination of region of interest [ROI] or a volume of interest [VOI]
• G06V 10/26 Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion
• G06V 10/28 Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns
• G06V 10/3 Noise filtering
• G06V 10/32 Normalisation of the pattern dimensions
• G06V 10/34 Smoothing or thinning of the pattern; Morphological operations; Skeletonisation
• G06V 10/36 Applying a local operator, i.e. means to operate on image points situated in the vicinity of a given point; Non-linear local filtering operations, e.g. median filtering