roc_example_lpr.c

Source code for examples/roc_example_lpr.c.

/*
 * This example application takes a command line input of an image path
 * and outputs the license plate recognition (LPR) results.
 *
 * To compile this example on OS X / Linux (bash):
 *
 *     $ gcc -o roc-example-lpr roc_example_lpr.c -I ../include/ -L ../lib/ -Wl,-rpath,'$ORIGIN/../lib:../lib' -lroc
 *
 * To compile this example on Windows (Visual Studio Command Prompt):
 *
 *     $ cl roc-example-lpr.c /TP /I ../include/ ../lib/roc.lib /Feroc-example-lpr.exe
 *
 * To run this application using an example image:
 *
 *     Linux
 *     $ ./roc-example-lpr ../lib ../data/car.jpg
 *
 *     Windows
 *     $ .\roc-example-lpr.exe . ..\data\car.jpg
 */

#include <stdio.h>
#include <stdlib.h>

#include "roc.h"

int main(int argc, char *argv[])
{
    roc_image image;
    roc_template templates[10];
    size_t adaptive_minimum_size;
    int i;

    if (argc != 3)
        roc_ensure("Expected two arguments:\n"
        #ifdef _WIN32
                   "    > roc-example-lpr.exe path\\to\\rocsdk\bin path\\to\\image.jpg"
        #else // !_WIN32
                   "    $ roc-example-lpr path/to/rocsdk/lib path/to/image.jpg"
        #endif // _WIN32
        );

    // Initialize SDK
    roc_ensure(roc_initialize(NULL, NULL));
    roc_ensure(roc_set_model_path(argv[1]));

    // Detect up to ten words in the image
    roc_ensure(roc_read_image(argv[2], ROC_BGR24, &image));
    roc_ensure(roc_adaptive_minimum_size(image.width, image.height, ROC_SUGGESTED_RELATIVE_MIN_SIZE, ROC_SUGGESTED_ABSOLUTE_MIN_SIZE, &adaptive_minimum_size));
    roc_ensure(roc_represent(image, ROC_LICENSE_PLATE_DETECTION, adaptive_minimum_size, 10, ROC_TEXT_SUGGESTED_FALSE_DETECTION_RATE, ROC_TEXT_SUGGESTED_MIN_QUALITY, &templates[0]));

    for (i=0; i<10; i++) {
        if (!templates[i].algorithm_id) {
            if (i == 0)
               puts("Failed to detect text in image!");
            break;
        }

        roc_string text, state;
        roc_ensure(roc_get_metadata(templates[i], "Text", &text));
        roc_ensure(roc_get_metadata(templates[i], "LicensePlateState", &state));
        printf("%s    State = %s   Confidence = %f    Center = (%d, %d)    Size = (%d, %d)\n", text, state, templates[i].detection.confidence, (int)templates[i].detection.x, (int)templates[i].detection.y, (int)templates[i].detection.width, (int)templates[i].detection.height);
        roc_ensure(roc_free_string(&text));
        roc_ensure(roc_free_string(&state));

        roc_ensure(roc_free_template(&templates[i]));
    }

    // Cleanup
    roc_ensure(roc_free_image(image));
    roc_ensure(roc_finalize());
    return EXIT_SUCCESS;
}