makeimg.manysquares¶

makeimg.manysquares(N, ns=0.0)[source]¶

Create a piece-wise linear gray-scale image of 16 squares with gradually increasing intensities

Parameters:	N : int Image dimension (image is an N-by-N array) ns : float Noise level applied to the image, i.e., 0.1 = 10% noise, 0.2 = 20% noise, etc. Thus ns has to satisfy 0 <= ns <= 1. By default ns = 0.0.
Returns:	It : NumPy 2darray Array representation of the image (2D array)

See also

spikes

piece-wise linear test image of four squares

bars

piece-wise linear test image of rectangles

tgvtest

gray scale image widely used to illustrate weaknesses of total variation denoising