Feature/flexible sunflare brightness

[momincks]

fix #2067

My approach is to find the weighted brightness from the flare circles and use it to define the max alpha (max brightness) of the spots. The brighter and larger the flare circles, the brighter the spots will be. Max alpha could still be high (>0.8), meaning blocking the object behind it, but for alpha currently in range (0.05, 0.2), max alpha will mostly be around 0.5-0.7.

That should give a more natural look at the whole effect.

RandomSunFlare(
flare_roi=[0,0,1,0.5],
src_radius=400,
src_color=[255,255,255],
angle_range=[0,1],
num_flare_circles_range=[6,10],
method="overlay",
p=1))

Summary by Sourcery

New Features:

• Introduce a flexible sunflare brightness feature that adjusts the maximum alpha of flare spots based on the weighted brightness and size of flare circles.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR implements a flexible sunflare brightness effect by calculating a weighted brightness based on flare circles' properties. The implementation modifies the alpha calculation for sun flare spots to create a more natural-looking effect where the brightness of spots correlates with the size and intensity of flare circles.

Class diagram for Sun Flare Brightness Calculation

classDiagram
    class SunFlareOverlay {
        +add_sun_flare_overlay(img, circles, flare_center, src_radius)
        +calculate_weighted_brightness(circles)
        +calculate_max_alpha(weighted_brightness, total_radius_length)
    }

    SunFlareOverlay : float weighted_brightness
    SunFlareOverlay : float total_radius_length
    SunFlareOverlay : float max_alpha

    note for SunFlareOverlay "This class handles the calculation of sun flare brightness using weighted brightness and max alpha."

Loading

File-Level Changes

Change	Details	Files
Implemented dynamic brightness calculation for sun flare effect	Added weighted brightness calculation based on flare circles' alpha and radius Introduced total radius length tracking for normalization Modified alpha calculation to use weighted brightness for maximum value Added scaling factor of 5 to maintain reasonable brightness levels Implemented capping of maximum alpha to 1.0	albumentations/augmentations/functional.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2067	Add transparency/reduce opacity of the sun flare effect so it doesn't completely obscure objects behind it	✅

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[sourcery-ai]

Hey @momincks - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[ternaus]

@momincks Thanks for the PR.

In order to merge the PR you need to use pre-commit hook on your code. https://github.com/albumentations-team/albumentations/blob/main/docs/contributing/coding_guidelines.md#pre-commit-hooks