Lecture6

# Lecture6 - CSC589 Introduction to Computer Vision Lecture 6...

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CSC589 Introduction to Computer Vision Lecture 6 Image Derivative, Image-Denoising Bei Xiao

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Last lecture Linear Algebra Matrix computation in Python
Today’s lecture More on Image derivatives Quiz Image De-noising Median Filter Introduction to Frequency analysis Homework is due today! Please follow hand-in instructions. Be sure to include your write-up document!!

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Compute Image Gradient The first order derivative of Image I in x, and in y direction
Compute gradient: first order derivatives Slide source: Jianbo Shi

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Compute gradient: first order derivatives Slide source: Jianbo Shi

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Example

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Usage in Python s1 = np.array([1,1]) dx = np.array([1,-1]) dy = np.array([1,-1]) x = ndimage.convolve1d(l,dx,axis= 0) gx_I = ndimage.convolve(x,s)
Usage in Python s1 = np.array([1,1]) dx = np.array([1,-1]) dy = np.array([1,-1])

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