perf(lib): unroll image method and use_scan=True/False

[jeertmans]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.82%. Comparing base (e23f941) to head (5bdcc0a).
Report is 119 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   77.74%   77.82%   +0.08%     
==========================================
  Files          25       25              
  Lines        1532     1538       +6     
==========================================
+ Hits         1191     1197       +6     
  Misses        341      341              

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[codspeed-hq]

CodSpeed Performance Report

Merging #119 will degrade performances by 98.39%

_{Comparing perf (73a4fde) with main (e23f941)}

Summary

⚡ 1 improvements
❌ 9 regressions
✅ 5 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	perf	Change
⚡	test_compute_paths_in_simple_street_canyon_scene[20000-0]	1,497.3 ms	36.1 ms	×41
❌	test_compute_paths_in_simple_street_canyon_scene[20000-1]	38.3 ms	2,372.7 ms	-98.39%
❌	test_compute_paths_in_simple_street_canyon_scene[20000-2]	2 s	2.3 s	-13.36%
❌	test_compute_paths_in_simple_street_canyon_scene[None-1]	2.2 s	2.5 s	-12.36%
❌	test_compute_paths_in_simple_street_canyon_scene[None-2]	2.6 s	2.9 s	-10.52%
❌	test_image_method[batch0]	329.2 ms	472.2 ms	-30.29%
❌	test_image_method[batch1]	383.3 ms	573 ms	-33.11%
❌	test_image_method[batch2]	453 ms	711.7 ms	-36.35%
❌	test_transmitter_visibility_in_simple_street_canyon_scene[10000]	813.5 ms	925 ms	-12.05%
❌	test_transmitter_visibility_in_simple_street_canyon_scene[1000]	498.3 ms	595.2 ms	-16.29%