First order gaussian derivative filter

1. What is first order derivative filter?
2. What is Gaussian derivative filter?
3. Is derivative of Gaussian filter separable?
4. Is Sobel a first order derivative operator?

What is first order derivative filter?

In this paper the first method we will find the edge for image by using (1st Order Derivative Filter ) method. In this method we take the 1st derivative of the intensity value across the image and find points where the derivative is maximum then the edge could be located.

What is Gaussian derivative filter?

In electronics and signal processing mainly in digital signal processing, a Gaussian filter is a filter whose impulse response is a Gaussian function (or an approximation to it, since a true Gaussian response would have infinite impulse response).

Is derivative of Gaussian filter separable?

In practice it is common to use the discrete approximation given by the binomial filters. As Gaussians are separable, we can approximate two 1D derivatives and then convolve them.

Is Sobel a first order derivative operator?

The Sobel method, or Sobel filter, is a gradient-based method that looks for strong changes in the first derivative of an image. The Sobel edge detector uses a pair of 3 × 3 convolution masks, one estimating the gradient in the x-direction and the other in the y-direction.