使用 ESP32 Camera 进行二维码识别
使用 ESP32 Camera 进行二维码识别环境搭建使用 quirc 二维码识别库摄像头初始化二维码识别示例结果使用 ESP32 Camera 进行二维码识别
GitHub: esp32-camera-qr-recoginize环境搭建
ESP-WHOESP-IDF使用 quirc 二维码识别库
quirc摄像头初始化
#define CAMERA_PIXEL_FORM PIXFORMAT_GRAYSCALE#define CAMERA_FRAME_SIZE FRAMESIZE_VGAvoid app_main(){#if CONFIG_CAMERA_MODEL_CUSTOM/* IO13, IO14 is designed for JTAG by default,* to use it as generalized input,* firstly declair it as pullup input */gpio_config_t conf;conf.mode = GPIO_MODE_INPUT;conf.pull_up_en = GPIO_PULLUP_ENABLE;conf.pull_down_en = GPIO_PULLDOWN_DISABLE;conf.intr_type = GPIO_INTR_DISABLE;conf.pin_bit_mask = 1LL << 13;gpio_config(&conf);conf.pin_bit_mask = 1LL << 14;gpio_config(&conf);#endifconfig.ledc_channel = LEDC_CHANNEL_0;config.ledc_timer = LEDC_TIMER_0;config.pin_d0 = Y2_GPIO_NUM;config.pin_d1 = Y3_GPIO_NUM;config.pin_d2 = Y4_GPIO_NUM;config.pin_d3 = Y5_GPIO_NUM;config.pin_d4 = Y6_GPIO_NUM;config.pin_d5 = Y7_GPIO_NUM;config.pin_d6 = Y8_GPIO_NUM;config.pin_d7 = Y9_GPIO_NUM;config.pin_xclk = XCLK_GPIO_NUM;config.pin_pclk = PCLK_GPIO_NUM;config.pin_vsync = VSYNC_GPIO_NUM;config.pin_href = HREF_GPIO_NUM;config.pin_sscb_sda = SIOD_GPIO_NUM;config.pin_sscb_scl = SIOC_GPIO_NUM;config.pin_pwdn = PWDN_GPIO_NUM;config.pin_reset = RESET_GPIO_NUM;// Only support 10 MHz current. Camera will output bad image when XCLK is 20 MHz.config.xclk_freq_hz = 10000000;config.pixel_format = CAMERA_PIXEL_FORM;config.frame_size = CAMERA_FRAME_SIZE;config.jpeg_quality = 10;config.fb_count = 1;// camera initesp_err_t err = esp_camera_init(&config);if (err != ESP_OK) {ESP_LOGE(TAG, "Camera init failed with error 0x%x", err);return;}/*** Create QR-code recognize task*/app_qr_recognize(&config);ESP_LOGI(TAG, "Free heap: %u", xPortGetFreeHeapSize());}
二维码识别
void qr_recoginze(void *parameter){camera_config_t *camera_config = (camera_config_t *)parameter;// Use VGA Size currently, but quirc can support other frame size.(eg: FRAMESIZE_SVGA,FRAMESIZE_VGA，// FRAMESIZE_CIF,FRAMESIZE_QVGA,FRAMESIZE_HQVGA,FRAMESIZE_QCIF,FRAMESIZE_QQVGA2,FRAMESIZE_QQVGA,etc)if (camera_config->frame_size > FRAMESIZE_VGA) {ESP_LOGE(TAG, "Camera Frame Size err %d", (camera_config->frame_size));vTaskDelete(NULL);}// Save image width and height, avoid allocate memory repeatly.uint16_t old_width = 0;uint16_t old_height = 0;// Construct a new QR-code recognizer.ESP_LOGI(TAG, "Construct a new QR-code recognizer(quirc).");struct quirc *qr_recognizer = quirc_new();if (!qr_recognizer) {ESP_LOGE(TAG, "Can't create quirc object");}camera_fb_t *fb = NULL;uint8_t *image = NULL;int id_count = 0;UBaseType_t uxHighWaterMark;/* 入口处检测一次 */ESP_LOGI(TAG, "uxHighWaterMark = %d", uxTaskGetStackHighWaterMark( NULL ));while (1) {ESP_LOGI(TAG, "uxHighWaterMark = %d", uxTaskGetStackHighWaterMark( NULL ));// Capture a framefb = esp_camera_fb_get();if (!fb) {ESP_LOGE(TAG, "Camera capture failed");continue;}if (old_width != fb->width || old_height != fb->height) {ESP_LOGD(TAG, "Recognizer size change w h len: %d, %d, %d", fb->width, fb->height, fb->len);ESP_LOGI(TAG, "Resize the QR-code recognizer.");// Resize the QR-code recognizer.if (quirc_resize(qr_recognizer, fb->width, fb->height) < 0) {ESP_LOGE(TAG, "Resize the QR-code recognizer err.");continue;} else {old_width = fb->width;old_height = fb->height;}}/** These functions are used to process images for QR-code recognition.* quirc_begin() must first be called to obtain access to a buffer into* which the input image should be placed. Optionally, the current* width and height may be returned.** After filling the buffer, quirc_end() should be called to process* the image for QR-code recognition. The locations and content of each* code may be obtained using accessor functions described below.*/image = quirc_begin(qr_recognizer, NULL, NULL);memcpy(image, fb->buf, fb->len);quirc_end(qr_recognizer);// Return the number of QR-codes identified in the last processed image.id_count = quirc_count(qr_recognizer);if (id_count == 0) {ESP_LOGE(TAG, "Error: not a valid qrcode");esp_camera_fb_return(fb);continue;}// Print information of QR-codedump_info(qr_recognizer, id_count);esp_camera_fb_return(fb);}// Destroy QR-Code recognizer (quirc)quirc_destroy(qr_recognizer);ESP_LOGI(TAG, "Deconstruct QR-Code recognizer(quirc)");vTaskDelete(NULL);}
