""" PyTest's for Digital Image Processing """ from cv2 import COLOR_BGR2GRAY, cvtColor, imread from numpy import array, uint8 from PIL import Image from digital_image_processing import change_contrast as cc from digital_image_processing import convert_to_negative as cn from digital_image_processing import sepia as sp from digital_image_processing.dithering import burkes as bs from digital_image_processing.edge_detection import canny as canny from digital_image_processing.filters import convolve as conv from digital_image_processing.filters import gaussian_filter as gg from digital_image_processing.filters import median_filter as med from digital_image_processing.filters import sobel_filter as sob from digital_image_processing.resize import resize as rs img = imread(r"digital_image_processing/image_data/lena_small.jpg") gray = cvtColor(img, COLOR_BGR2GRAY) # Test: convert_to_negative() def test_convert_to_negative(): negative_img = cn.convert_to_negative(img) # assert negative_img array for at least one True assert negative_img.any() # Test: change_contrast() def test_change_contrast(): with Image.open("digital_image_processing/image_data/lena_small.jpg") as img: # Work around assertion for response assert str(cc.change_contrast(img, 110)).startswith( "<PIL.Image.Image image mode=RGB size=100x100 at" ) # canny.gen_gaussian_kernel() def test_gen_gaussian_kernel(): resp = canny.gen_gaussian_kernel(9, sigma=1.4) # Assert ambiguous array assert resp.all() # canny.py def test_canny(): canny_img = imread("digital_image_processing/image_data/lena_small.jpg", 0) # assert ambiguous array for all == True assert canny_img.all() canny_array = canny.canny(canny_img) # assert canny array for at least one True assert canny_array.any() # filters/gaussian_filter.py def test_gen_gaussian_kernel_filter(): assert gg.gaussian_filter(gray, 5, sigma=0.9).all() def test_convolve_filter(): # laplace diagonals Laplace = array([[0.25, 0.5, 0.25], [0.5, -3, 0.5], [0.25, 0.5, 0.25]]) res = conv.img_convolve(gray, Laplace).astype(uint8) assert res.any() def test_median_filter(): assert med.median_filter(gray, 3).any() def test_sobel_filter(): grad, theta = sob.sobel_filter(gray) assert grad.any() and theta.any() def test_sepia(): sepia = sp.make_sepia(img, 20) assert sepia.all() def test_burkes(file_path: str = "digital_image_processing/image_data/lena_small.jpg"): burkes = bs.Burkes(imread(file_path, 1), 120) burkes.process() assert burkes.output_img.any() def test_nearest_neighbour( file_path: str = "digital_image_processing/image_data/lena_small.jpg", ): nn = rs.NearestNeighbour(imread(file_path, 1), 400, 200) nn.process() assert nn.output.any()