From e09aa90e0e388d4c42e38381961bc3fa1771cff3 Mon Sep 17 00:00:00 2001 From: Nguyễn Gia Phong Date: Wed, 8 Jul 2020 14:11:07 +0700 Subject: [usth/ICT2.{5,12}] Process images and base data --- usth/ICT2.12/labwork/1 | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100755 usth/ICT2.12/labwork/1 (limited to 'usth/ICT2.12/labwork/1') diff --git a/usth/ICT2.12/labwork/1 b/usth/ICT2.12/labwork/1 new file mode 100755 index 0000000..2590192 --- /dev/null +++ b/usth/ICT2.12/labwork/1 @@ -0,0 +1,55 @@ +#!/usr/bin/env python3 +from cv2 import ( + THRESH_BINARY, ADAPTIVE_THRESH_MEAN_C, + adaptiveThreshold as adaptive_threshold, calcHist as calc_hist, blur, + equalizeHist as equalize_hist, GaussianBlur as gaussian_blur, + imread, imshow, Laplacian as laplacian, medianBlur as median_blur, + resize, Sobel as sobel, threshold, waitKey as wait_key) +from numpy import uint8 + +FILENAME = 'dino-gang.jpg' +GREYSCALE_COEFF = 0.2126, 0.7152, 0.0722 +THRESHOLD, WHITE = 128, 255 +BLUR_KSIZE = 6, 9 + + +def disp(image, name): + """Display the given image.""" + imshow(name, image.astype(uint8)) + wait_key() + + +# Exercise 1 +image = imread(FILENAME) +disp(image, 'original') + +# Exercise 2 +disp(resize(image, (512, 512)), 'square') + +# Exercise 3 +# I'm going to ignore about cv2.IMREAD_GRAYSCALE +grey_image = uint8(image.dot(GREYSCALE_COEFF)) +disp(grey_image, 'grey') + +# Exercise 4 +a, b = 1/2, 1/3 +disp(image*a+b, 'brightness adjusted') + +# Exercise 5 +disp(threshold(grey_image, THRESHOLD, WHITE, THRESH_BINARY)[-1], + 'binary threshold') +disp(adaptive_threshold(grey_image, WHITE, ADAPTIVE_THRESH_MEAN_C, + THRESH_BINARY, 25, 12), 'adaptive threshold') + +# Exercise 6 +hist = calc_hist([grey_image], [0], None, [256], [0, 256]) +disp(equalize_hist(grey_image), 'equalized') + +# Exercise 7 +disp(blur(image, BLUR_KSIZE), 'blur') +disp(gaussian_blur(image, (0, 0), 5), 'Gaussian blur') +disp(median_blur(image, 7), 'median blur') + +# Exercise 8 +disp(laplacian(image, 2), 'Laplacian') +disp(sobel(image, 2, 1, 1), 'Sobel') -- cgit 1.4.1