163 lines
4.9 KiB
Python
163 lines
4.9 KiB
Python
import cv2 as cv
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import numpy as np
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from glob import glob
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# the directory of the image database
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database_dir = "image.orig"
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# Compute pixel-by-pixel difference and return the sum
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def compareImgs(img1, img2):
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# resize img2 to img1
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img2 = cv.resize(img2, (img1.shape[1], img1.shape[0]))
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diff = cv.absdiff(img1, img2)
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return diff.sum()
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def compareImgs_hist(img1, img2):
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width, height = img1.shape[1], img1.shape[0]
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img2 = cv.resize(img2, (width, height))
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num_bins = 10
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hist1 = [0] * num_bins
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hist2 = [0] * num_bins
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bin_width = 255.0 / num_bins + 1e-4
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# compute histogram from scratch
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# for w in range(width):
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# for h in range(height):
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# hist1[int(img1[h, w] / bin_width)] += 1
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# hist2[int(img2[h, w] / bin_width)] += 1
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# compute histogram by using opencv function
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# https://docs.opencv.org/4.x/d6/dc7/group__imgproc__hist.html#ga4b2b5fd75503ff9e6844cc4dcdaed35d
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hist1 = cv.calcHist([img1], [0], None, [num_bins], [0, 255])
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hist2 = cv.calcHist([img2], [0], None, [num_bins], [0, 255])
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sum = 0
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for i in range(num_bins):
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sum += abs(hist1[i] - hist2[i])
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return sum / float(width * height)
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def retrieval():
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print("1: beach")
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print("2: building")
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print("3: bus")
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print("4: dinosaur")
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print("5: flower")
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print("6: horse")
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print("7: man")
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choice = input("Type in the number to choose a category and type enter to confirm\n")
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if choice == '1':
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src_input = cv.imread("beach.jpg")
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print("You choose: %s - beach\n" % choice)
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if choice == '2':
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src_input = cv.imread("building.jpg")
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print("You choose: %s - building\n" % choice)
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if choice == '3':
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src_input = cv.imread("bus.jpg")
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print("You choose: %s - bus\n" % choice)
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if choice == '4':
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src_input = cv.imread("dinosaur.jpg")
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print("You choose: %s - dinosaur\n" % choice)
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if choice == '5':
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src_input = cv.imread("flower.jpg")
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print("You choose: %s - flower\n" % choice)
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if choice == '6':
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src_input = cv.imread("horse.jpg")
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print("You choose: %s - horse\n" % choice)
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if choice == '7':
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src_input = cv.imread("man.jpg")
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print("You choose: %s - man\n" % choice)
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min_diff = 1e50
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# src_input = cv.imread("man.jpg")
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cv.imshow("Input", src_input)
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# change the image to gray scale
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src_gray = cv.cvtColor(src_input, cv.COLOR_BGR2GRAY)
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# read image database
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database = sorted(glob(database_dir + "/*.jpg"))
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for img in database:
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# read image
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img_rgb = cv.imread(img)
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# convert to gray scale
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img_gray = cv.cvtColor(img_rgb, cv.COLOR_BGR2GRAY)
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# compare the two images
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diff = compareImgs(src_gray, img_gray)
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# compare the two images by histogram, uncomment the following line to use histogram
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# diff = compareImgs_hist(src_gray, img_gray)
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print(img, diff)
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# find the minimum difference
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if diff <= min_diff:
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# update the minimum difference
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min_diff = diff
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# update the most similar image
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closest_img = img_rgb
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result = img
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print("the most similar image is %s, the pixel-by-pixel difference is %f " % (result, min_diff))
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print("\n")
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cv.imshow("Result", closest_img)
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cv.waitKey(0)
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cv.destroyAllWindows()
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def SIFT():
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img1 = cv.imread("flower.jpg")
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img2 = cv.imread("image.orig/685.jpg")
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if img1 is None or img2 is None:
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print('Error loading images!')
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exit(0)
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#-- Step 1: Detect the keypoints using SIFT Detector, compute the descriptors
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minHessian = 400
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detector = cv.SIFT_create()
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keypoints1, descriptors1 = detector.detectAndCompute(img1, None)
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keypoints2, descriptors2 = detector.detectAndCompute(img2, None)
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#-- Step 2: Matching descriptor vectors with a brute force matcher
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matcher = cv.DescriptorMatcher_create(cv.DescriptorMatcher_BRUTEFORCE)
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matches = matcher.match(descriptors1, descriptors2)
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#-- Draw matches
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img_matches = np.empty((max(img1.shape[0], img2.shape[0]), img1.shape[1]+img2.shape[1], 3), dtype=np.uint8)
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cv.drawMatches(img1, keypoints1, img2, keypoints2, matches, img_matches)
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#-- Show detected matches
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cv.imshow('Matches: SIFT (Python)', img_matches)
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cv.waitKey()
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# draw good matches
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matches = sorted(matches, key = lambda x:x.distance)
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min_dist = matches[0].distance
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good_matches = tuple(filter(lambda x:x.distance <= 2 * min_dist, matches))
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img_matches = np.empty((max(img1.shape[0], img2.shape[0]), img1.shape[1]+img2.shape[1], 3), dtype=np.uint8)
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cv.drawMatches(img1, keypoints1, img2, keypoints2, good_matches, img_matches, flags=cv.DrawMatchesFlags_NOT_DRAW_SINGLE_POINTS)
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#-- Show detected matches
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cv.imshow('Good Matches: SIFT (Python)', img_matches)
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cv.waitKey()
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def main():
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# img = cv.imread("beach.jpg")
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# cv.imshow("Image", img)
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# from matplotlib import pyplot as plt
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# plt.hist(img.ravel(),10,[0,256]); plt.show()
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# gray_img = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
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# cv.imshow("Gray Image", gray_img)
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# cv.waitKey()
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print("1: Image retrieval demo")
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print("2: SIFT demo")
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number = int(input("Type in the number to choose a demo and type enter to confirm\n"))
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if number == 1:
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retrieval()
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elif number == 2:
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SIFT()
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# pass
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else:
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print("Invalid input")
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exit()
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main()
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