LPR in Hailo 15h

Parimal_Panchal · January 2, 2026, 7:18am

Hello Everyone.

I’m trying to develop LPR pipeline using Hailo 15h. For firmware specification i am using 4.21.0 of hailort and 1.7.0 hailo media library across the OS.

RIght now I’m trying to build License Plate Detection pipeline with the prebuilt hailo-gstreamer plugins, I have taken reference for lpr detection pipeline from hailo-camera-apps repo:

github.com/hailo-ai/hailo-camera-apps

apps/h15/gstreamer/license_plate_recognition/license_plate_recognition.sh

1.7.0

#!/bin/bash
set -e

CURRENT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"

function init_variables() {
    print_help_if_needed $@

    # Basic Directories
    readonly POSTPROCESS_DIR="/usr/lib/hailo-post-processes"
    readonly CROPPING_ALGORITHMS_DIR="$POSTPROCESS_DIR/cropping_algorithms"
    readonly RESOURCES_DIR="${CURRENT_DIR}/resources"
    readonly DEFAULT_LICENSE_PLATE_JSON_CONFIG_PATH="$RESOURCES_DIR/configs/yolov4_license_plate.json"
    readonly DEFAULT_ENCODER_CONFIG_PATH="$RESOURCES_DIR/configs/encoder_config.json"

    # Default Video
    readonly DEFAULT_VIDEO_SOURCE="$RESOURCES_DIR/lpr_nv12.raw"

    # Vehicle Detection Macros
    readonly VEHICLE_DETECTION_HEF="$RESOURCES_DIR/yolov5m_vehicles_nv12.hef"

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Main roadblock is i can’t find all the mentioned resources in this reference script,
Can someone help if these module are available prebuilt or not.

If available then where can i exactly find all the mentioned cross compiled nv12 format AI models.
(yolov5m_vehicles_nv12.hef, tiny_yolov4_license_plates_nv12.hef, lprnet_nv12.hef)
and postprocesses also:
liblpr_overlay.so, liblpr_ocrsink.so

if the resource are not available then can you please guide me to build this hailo-camera-app repo or show me the way to do it.