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What did I forget? (lemmy.world)
submitted 3 days ago* (last edited 2 days ago) by benni@lemmy.world to c/lemmyshitpost@lemmy.world
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[-] residentoflaniakea@discuss.tchncs.de 148 points 3 days ago* (last edited 2 days ago)

I see a flag. I like flags. Especially the Japanese flags. I don't specifically care for Japan, but the flag is one of my favourites. I prefer flags with low entropy: so I wrote a script once that ranks the nations flags by entropy so I could quantify my preference. Thanks for letting me infodump a bit.

Edit: Due to people aski g for it: here is the top ten of my ranking:

Nations' flag entropy ranking (n=208). 
Image source: Wikimedia.

0	white_field			-1.439759075204976e-10
1	Indonesia			3.3274441922278752
2	Germany			3.391689777286108
3	South_Ossetia			3.8174437373506778
4	Monaco			3.9718936201427066
5	Poland			3.9719290780440133
6	Austria			4.372592975412404
7	Ukraine			4.405280849871184
8	Hungary			4.4465472496385985
9	Albania			4.6134257669087395
10	Mauritius			4.707109405551959
11	Luxembourg			4.721346585737304

Here's how I defined the entropy value for each flag:

def color_weighted_spectral_entropy(image):
    b_channel, g_channel, r_channel = cv2.split(image)
    
    # Calculate spectral entropy for each channel
    def channel_spectral_entropy(channel):
        f_transform = np.fft.fft2(channel)
        f_shifted = np.fft.fftshift(f_transform)
        magnitude_spectrum = np.abs(f_shifted)
        if np.sum(magnitude_spectrum) > 0:
            normalized = magnitude_spectrum / np.sum(magnitude_spectrum)
        else:
            normalized = magnitude_spectrum
        # Entropy calculation with color channel weighting
        epsilon = 1e-10
        entropy = -np.sum(normalized * np.log2(normalized + epsilon))
        
        return entropy
    
    weighted_entropy = (
        0.333 * channel_spectral_entropy(b_channel) +
        0.333 * channel_spectral_entropy(g_channel) +
        0.333 * channel_spectral_entropy(r_channel)
    )
    
    return float(weighted_entropy)

"White_field" is just an array that holds zeroes. I use this as a sanity check. Code is on github. I can send DM to whomever is interested. I guess it can also be searched for.

[-] kittenzrulz123@lemmy.dbzer0.com 2 points 2 days ago

I also love flags, flags are so beautiful (except the flag of Haiti, fuck you Haiti with your MS paint looking flag)

Their previous version was indeed without the coat of arms. Much cooler I think. During that time the Liechtenstein flag was identical, but they (Liechtenstein) changed it upon discovery.

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this post was submitted on 29 Nov 2025
628 points (100.0% liked)

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