OpenCV Sount Alert (Object Detection)

Python
1

Hello everyone
I am interested in OpenCV as an amateur. I have an object detection code with the SSD_Mobilet method. I have object information in the objectInfo variable. How can I get this information as a sound alert? Also, I carry out my work with Raspberry Pi 4 .

from cv2 import cv2

thres = 0.45

classNames= []

classFile = 'coco.names'

with open(classFile,'rt') as f:

    classNames = f.read().rstrip('\n').split('\n')

configPath = 'ssd_mobilenet_v3_large_coco_2020_01_14.pbtxt'

weightsPath = 'frozen_inference_graph.pb'

net = cv2.dnn_DetectionModel(weightsPath,configPath)

net.setInputSize(320,320)

net.setInputScale(1.0/ 127.5)

net.setInputMean((127.5, 127.5, 127.5))

net.setInputSwapRB(True)

def getObjects(img, thresh, nms, draw = True,objects = []):

    classIds, confs, bbox = net.detect(img,confThreshold=thres,nmsThreshold=nms)

    #print(classIds,bbox)

    if len(objects) == 0: objects = classNames

    objectInfo = []

    if len(classIds) != 0:

        for classId, confidence,box in zip(classIds.flatten(),confs.flatten(),bbox):

            className = classNames[classId-1]

            if className in objects:

                objectInfo.append([className])

                if (draw):

                    cv2.rectangle(img,box,color=(0,255,0),thickness=2)

                    cv2.putText(img,className.upper(),(box[0]+10,box[1]+30),

                                cv2.FONT_HERSHEY_COMPLEX,1,(0,255,0),2)

                    cv2.putText(img,str(round(confidence*100,2)),(box[0]+200,box[1]+30),

                                cv2.FONT_HERSHEY_COMPLEX,1,(0,255,0),2)

    return img, objectInfo

    

if __name__ == "__main__":

    cap = cv2.VideoCapture(0)

    cap.set(3,640)

    cap.set(4,480)

    #cap.set(10,70)

    while True:

        success,img = cap.read()

        result, objectInfo = getObjects(img, 0.45, 0.2, objects = [])

        print(objectInfo)

        cv2.imshow("Output",img)

        if cv2.waitKey(50) & 0xFF == ord('q'):

            break

cap.release()

cv2.destroyAllWindows()
2

You can obviously produce sound using any means your platform and programming language provide, and search guidance for it in more appropriate forums.

3

“how to play sound on a raspi ?”

this is really off-topic here, sorry.