object.proto

syntax = "proto3";
package license_plate_recognition;

option go_package = "./;protos";

// Essential information to process
message LPRRequest{
    // Bytes representation of image (PNG)
    bytes image = 1;
    // Optional information about image. Could be usefull if client-side already knows where license plate should be located (due some object detections technique)
    BBox bbox = 2;
}

// Reference information about detection rectangle
message BBox{
    int32 x_left = 1;
    int32 y_top = 2;
    int32 height = 3;
    int32 width = 4;
}

// Response from server
message LPRResponse{
    // Set of found license plates with corresponding information
    repeated LPRInfo license_plates = 1;
    // Number of seconds has taken to proccess license plate detections and OCR
    float elapsed = 2;
    // Optional message from server
    string message = 3;
    // Optional warning message from server. If it is not empty you probably should investiage such behavior
    string warning = 4;
    // Optional error message from server. If it is not empty you should investiage the error
    string error = 5;
}

// Information about single license plate
message LPRInfo {
    // License plate location
    BBox bbox = 1;
    // License plate OCR bounding bboxes. Bounding bboxes are sorted by horizontal line
    // Warning: those coordinates are relative to license plate bounding box, not the parent image!
    repeated BBox ocr_bboxes = 2;
    // License plate text
    string text = 3;
}