Contents
- 1 What is Fourier descriptor?
- 2 Is Fourier descriptor a boundary descriptor?
- 3 Which of the following is a boundary descriptor?
- 4 Is it true that a signature is a 2d representation of a boundary?
- 5 Which filter used to find the brightest point in the image?
- 6 Which is an example of a Fourier coefficient?
- 7 When do the Fourier coefficients of an integrable function approach zero?
What is Fourier descriptor?
Fourier descriptors are derived from the Fourier series for the cumulative angular function of the cross-sectional boundary and are used to characterize shape complexity and other geometric attributes. Moreover, image-processing-based methods have been used for identifying different types of fibres in cross-section.
What are the advantages of Fourier descriptors?
The advantage is that it is possible to capture coarse shape properties with only a few numeric values, and the level of detail can be increased (or decreased) by adding (or removing) descriptor elements.
Is Fourier descriptor a boundary descriptor?
Fourier descriptors A method used in object recognition and image processing to represent the boundary shape of a segment in an image. The first few terms in a Fourier series provide the basis of a descriptor.
What is generic Fourier descriptor?
A generic Fourier descriptor (GFD) is proposed to overcome the drawbacks of existing shape representation techniques. The proposed shape descriptor is derived by applying a 2D Fourier transform on a polar raster sampled shape image. The acquired shape descriptor is application independent and robust.
Which of the following is a boundary descriptor?
3. Which of the following is the useful descriptor of a boundary, whose value is given by the ratio of length of the major axis to the minor axis? Explanation: Eccentricity, which is the ratio of major axis to the minor axis which is one of the important parameter that is used to describe a boundary.
What is wavelet descriptor?
The wavelet descriptors are formed on the basis of wavelet representation of the original sequence (xi,yi), describing the boundary of the shape.
Is it true that a signature is a 2d representation of a boundary?
A shape signature is any one-dimensional function which represents a two-dimensional shape. This intensity value can be utilized to determine sub-pixel position of the shape boundary, which can then be used to produce more precise and accurate shape signature.
Which is a Colour attribute that describes a pure Colour?
Hue is a color attribute that describes a pure color where saturation gives a measure of the degree to which a pure color is diluted by white light.
Which filter used to find the brightest point in the image?
Explanation: A max filter gives the brightest point in an image and so is used.
What are the different ways of image boundary representation?
Image Segmentation.
Which is an example of a Fourier coefficient?
Fourier coefficients are the coefficients. in the Fourier series expansion of a periodic function f(x) with period 2Ƭ (see). Formulas (*) are sometimes called the Euler-Fourier formulas. A continuous function f(x) is uniquely determined by its Fourier coefficients.
Which is the correct formula for the Fourier series?
The formula for is inadequate for discussing the Fourier coefficients of several different functions. Therefore, it is customarily replaced by a modified form of the function ( represents time, the coefficient sequence is called a frequency domain representation.
When do the Fourier coefficients of an integrable function approach zero?
The Fourier coefficients of an integrable function f ( x) approach zero as n → ∞. Moreover, the rate of their decrease depends on the differentiability properties of f ( x ).
How are the coefficients of a periodic function determined?
Fourier Coefficient. Fourier coefficients are the coefficients. in the Fourier series expansion of a periodic function f(x) with period 2Ƭ (see). Formulas (*) are sometimes called the Euler-Fourier formulas. A continuous function f(x) is uniquely determined by its Fourier coefficients.