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Dedicated LPR fixes (#17325)

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* docs fps recommendation

* add detection_threshold to example

* send uncoverted yuv frame

* copy and convert

* ensure thumbnail is encoded as webp

* keep as jpeg
This commit is contained in:
Josh Hawkins
2025-03-23 17:15:15 -05:00
committed by GitHub
parent e129fa6819
commit 678ae87c62
2 changed files with 3 additions and 4 deletions
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4
docs/docs/configuration/license_plate_recognition.md
View File

@@ -133,8 +133,8 @@ Users with a dedicated LPR camera can run Frigate's LPR by specifying a camera t
# LPR global configuration # LPR global configuration
lpr: lpr:
enabled: True enabled: True
min_area: 2000
min_plate_length: 4 min_plate_length: 4
detection_threshold: 0.7 # change if necessary
# Dedicated LPR camera configuration # Dedicated LPR camera configuration
cameras: cameras:
@@ -146,7 +146,7 @@ cameras:
ffmpeg: ... ffmpeg: ...
detect: detect:
enabled: False # optional, disable Frigate's standard object detection pipeline enabled: False # optional, disable Frigate's standard object detection pipeline
fps: 5 fps: 5 # keep this at 5, higher values are unnecessary for dedicated LPR mode and could overwhelm the detector
width: 1920 width: 1920
height: 1080 height: 1080
motion: motion:

3
frigate/data_processing/common/license_plate/mixin.py
View File

@@ -1279,10 +1279,9 @@ class LicensePlateProcessingMixin:
# save the best snapshot # save the best snapshot
logger.debug(f"Writing snapshot for {id}, {top_plate}, {current_time}") logger.debug(f"Writing snapshot for {id}, {top_plate}, {current_time}")
frame_bgr = cv2.cvtColor(frame, cv2.COLOR_YUV2BGR_I420) frame_bgr = cv2.cvtColor(frame, cv2.COLOR_YUV2BGR_I420)
_, buffer = cv2.imencode(".jpg", frame_bgr)
self.sub_label_publisher.publish( self.sub_label_publisher.publish(
EventMetadataTypeEnum.save_lpr_snapshot, EventMetadataTypeEnum.save_lpr_snapshot,
(base64.b64encode(buffer).decode("ASCII"), id, camera), (base64.b64encode(frame_bgr).decode("ASCII"), id, camera),
) )
self.detected_license_plates[id] = { self.detected_license_plates[id] = {