Đồ án tốt nghiệp - Design a product classification system using QR code

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND
EDUCATION FACULTY OF INTERNATIONAL EDUCATION

GRADUATION THESIS

DESIGN A PRODUCT CLASSIFICATION SYSTEM
USING QR CODE

Supervisor: PhD. Ta Van Phuong
Student: Ho Phi Phong

Student ID: 20142243

Student: Nguyen Minh Khoi

Student ID: 20142221

Year of admission: 2020 - 2024
MAJOR: ELECTRICAL AND ELECTRONICS ENGINEERING TECHNOLOGY

Ho Chi Minh City, July 2025

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND
EDUCATION FACULTY OF INTERNATIONAL EDUCATION

GRADUATION THESIS

DESIGN A PRODUCT CLASSIFICATION SYSTEM
USING QR CODE

Supervisor: PhD. Ta Van Phuong
Student: Ho Phi Phong

Student ID: 20142243

Student: Nguyen Minh Khoi

Student ID: 20142221

Year of admission: 2020 - 2024
MAJOR: ELECTRICAL AND ELECTRONICS ENGINEERING TECHNOLOGY

Ho Chi Minh City, July 2025

ACKNOWLEDGMENTS
We would like to express our sincere thanks to the teachers who took the time to
pay attention and read this report. The attention of teachers is an honor as well as a
great motivation for our team to continue on the path of development in the near
future.
In order to get a complete graduation project and achieve the desired results, we
have received a lot of attention and support from many individuals and organizations.
With all respect for the contributions, we would like to express our deep gratitude to
everyone who has accompanied and facilitated the excellent completion of the
project. In particular, we would like to express our deep gratitude to the teachers of
the Faculty of International Training, Ho Chi Minh City University of Technology
and Education, who have always been dedicated to monitoring and guiding the group
during the research and learning process. The attention of the teachers is a great
motivation to help us have a solid knowledge base to complete this project. In
particular, we would like to thank PhD.Ta Van Phuong, who directly supported,
guided, and oriented the group to achieve the groups set goals.
Besides, we are also very grateful for the amount of knowledge from the articles of
experts from home and abroad. Our expertise and practical experience help us to
achieve our goals as well as upgrade our goals in the near future.
We hope that this report will practical values and contribute to the
development of product classification systems in the future.
We sincerely thank and wish you good health, a lot of joy and success in your work
and career.
Sincerely.

ABSTRACT
Product class
...

...
e2)
self.btn_save3 = self.findChild(QPushButton, btn_save3)
self.btn_save1.clicked.connect(lambda: self.capture_qr(0))
self.btn_save2.clicked.connect(lambda: self.capture_qr(1))
self.btn_save3.clicked.connect(lambda: self.capture_qr(2))
self.scene = QGraphicsScene()
self.view.setScene(self.scene)
self.qr_list = [, , ] # Danh sách lưu 3 mã QR
self.detector = cv2.QRCodeDetector()
self.available_cameras = self.get_available_cameras()
for cam in self.available_cameras:
self.camera_or.addItem(fCamera {cam}, cam)
self.camera_or.currentIndexChanged.connect(self.change_camera)
self.cap
=
cv2.VideoCapture(self.available_cameras[0]
self.available_cameras else 0)

if

self.timer = QTimer()
self.timer.timeout.connect(self._frame)
self.timer.start(30)
def get_available_cameras(self):
cams = []
for i in range(10):
cap = cv2.VideoCapture(i)
if cap.isOpened():

PA
GE
\\*

74

ADDENDUM

cams.append(i)
cap.release()
return cams
def change_camera(self, index):
camera_index = self.camera_or.currentData()
if self.cap.isOpened():
self.cap.release()
self.cap = cv2.VideoCapture(camera_index)
def _frame(self):
ret, frame = self.cap.read()
if not ret:
return
data, bbox, _ = self.detector.detectAndDecode(frame)
if bbox is not None and
self.qr_label4.setText(data)
bbox = bbox.astype(int)
for i in range(len(bbox[0])):
pt1 = tuple(bbox[0][i])
pt2 = tuple(bbox[0][(i + 1) % len(bbox[0])])
cv2.line(frame, pt1, pt2, (0, 255, 0), 2)
cv2.putText(frame, data, (bbox[0][0][0], bbox[0][0][1] - 10),
cv2.FONT_HERSHEY_SIMPLEX, 0.7, (255, 0, 0), 2)
# Compare with 3 saved codes and send the corresponding command
for i in range(3):
if data == self.qr_list[i]:
send_to_plc(i + 1)
break
rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
h, w, ch = rgb.shape
qimg = QImage(rgb.data, w, h, ch * w, QImage.Format_RGB888)
pixmap = QPixmap.fromImage(qimg)
self.scene.clear()
self.scene.addPixmap(pixmap)
def capture_qr(self, index):
text = self.qr_label4.text()
if not text:
print(❌ There is no QR code to save!)

PA
GE
\\*

75

ADDENDUM

return
self.qr_list[index] = text
if index == 0:
self.qr_label1.setText(text)
elif index == 1:
self.qr_label2.setText(text)
elif index == 2:
self.qr_label3.setText(text)
print(f✅ QR code saved to location {index + 1})
def closeEvent(self, event):
if self.cap:
self.cap.release()
event.accept()
if __name__ == __main__:
app = QApplication(sys.argv)
window = QRApp()
window.show()
sys.exit(app._())

PA
GE
\\*

76