Khushi Bharti

:)

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Information gain is the reduction in entropy and is often used in training decision trees. Information gain is calculated by comparing the entropy of the dataset before and after a transformation.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 It is used for detection of corner further which can be used for feature extraction and mapping , It is an efficient method than other descriptors.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Sift uses scale and invariance by assigning key points with orientations and scales based on image gradient directions.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 The thickness of edges can be corrected using non - maximum suppression.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 There occurs an overflow in where we exceed the maximum limit of the number when we add them which we can represent using 8 bits.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 The laplacian is 2D isotropic measure of the second spatial derivative of an image. It is applied to an image that has been smoothed using gaussian smoothing filter in order to reduce sensitivity to noise.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Prewitt operator is similar to the Sobel operator and is used for detecting vertical and horizontal edges in images. However, unlike the Sobel, this operator does not place any emphasis on the pixels that are near to the center of the mask.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 A low-pass filter is a filter that allows signals with a frequency lower than a selected cutoff frequency and restricts signals with frequencies higher than the cutoff frequency.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Low pass median filter is one of the examples of order statistics filter. It changes the value of a pixel by the median of the pixel values in the image neighbourhood of that pixel.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 High boost filtering is a sharpening operation. The filter is obtained by subtracting a low pass filtered image from the scaled original image. The high frequency components are boosted by giving extra weight to the edges .

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Histogram equalisation is a technique for adjusting the image intensities to enhance the contrast. Applying histogram twice would not change anything because this method increases the overall contrast of images when the data is represented by close contrast values.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Gamma encoding of images is used to optimize the usage of bits or bandwidth used to transport an image, by taking advantage of the non-linear manner in which humans perceive light and color.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Homogeneous coordinates are used because they allow us common operations like translation, scaling to be represented as matrix.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Contrast streching which is also called as normalization tries to improve the image by streching the range of intensity values it contains to make full use of possible values. The output is less dramatic but tends to avoid artificial appearance of equalized images.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 The main difference between high level language and low level language is that, programmers can easily compile high level language in comparison of machine. On the other hand, machine can easily understand the low level language comparison of human beings.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 Transformation means changing some graphics into something else by applying certain rules. We can have various types of transformation such as translation, scaling, rotation, shearing, flipping, etc.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 The two controls the amount of light that enters the camera and strike the image sensor. Changing the aperture affects the depth of field. Changing the shutter speed affects the motion blur.

[Khushi Bharti @Khushi_511]

@ShripadBhat7 It's very interesting to know about the fact that each one of our eyes has blind spot in the back of retina where the optic nerves attaches but we don't notice the hole in our vision because our eyes work together to fill each other's blind spot.

[Khushi Bharti @Khushi_511]

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