From c537c7ad294107b1804975c4e7ed0dc9886990cf Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Wed, 7 Jun 2023 10:22:02 +0200
Subject: better road detection

---
 nicla/downscale.py | 19 +++++++++++++++++++
 nicla/road.py      |  4 +++-
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 nicla/downscale.py

diff --git a/nicla/downscale.py b/nicla/downscale.py
new file mode 100644
index 0000000..738b4bb
--- /dev/null
+++ b/nicla/downscale.py
@@ -0,0 +1,19 @@
+import sensor, image, time, math
+
+sensor.reset()
+sensor.set_pixformat(sensor.RGB565)
+sensor.set_framesize(sensor.HVGA)
+sensor.skip_frames(time = 2000)
+sensor.set_vflip(True)
+sensor.set_hmirror(True)
+clock = time.clock()
+
+def main():
+  img = sensor.snapshot()
+  img.to_grayscale()
+  img.scale(copy_to_fb=True, x_size=100)
+
+if __name__ == "__main__":
+  while(True):
+    main()
+    clock.tick()
diff --git a/nicla/road.py b/nicla/road.py
index ceabc3b..20863cc 100644
--- a/nicla/road.py
+++ b/nicla/road.py
@@ -10,6 +10,8 @@ clock = time.clock()
 
 WIDTH = 480
 HEIGHT = 320
+MAX_AREA = WIDTH * HEIGHT / 10
+MIN_AREA = 40
 
 HORIZON = 150
 STRETCH = 40
@@ -35,7 +37,7 @@ def main():
 
   for blob in img.find_blobs([(ROAD_MIN_BRIGHTNESS, 0xff)], pixels_threshold=100):
     img.draw_rectangle(blob.rect())
-    area_weight = blob.area()
+    area_weight = MIN_AREA + min(MAX_AREA, blob.w() * blob.h()) # limit max area_weight so small blobs still have impact
     horizontal_pos = (blob.x() + blob.w()/2) / WIDTH
     offset_sum += horizontal_pos * area_weight
     offset_count += area_weight
-- 
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