Example explanation 16-Codes->find_barcodes barcode recognition
Video tutorial 15 - Scan code recognition: https://singtown.com/learn/50017/
# 条形码识别例程
#
# 这个例子展示了使用OpenMV Cam M7来检测条形码是多么容易。条形码检测不适用于M4相机。
import sensor, image, time, math
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.VGA) # High Res!
sensor.set_windowing((640, 80)) # V Res of 80 == less work (40 for 2X the speed).
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # 必须关闭此功能,以防止图像冲洗…
sensor.set_auto_whitebal(False) # 必须关闭此功能,以防止图像冲洗…
clock = time.clock()
# 条形码检测可以在OpenMV Cam的OV7725相机模块的640x480分辨率下运行。
# 条码检测也将在RGB565模式下工作,但分辨率较低。 也就是说,
# 条形码检测需要更高的分辨率才能正常工作,因此应始终以640x480的灰度运行。
def barcode_name(code):
if(code.type() == image.EAN2):
return "EAN2"
if(code.type() == image.EAN5):
return "EAN5"
if(code.type() == image.EAN8):
return "EAN8"
if(code.type() == image.UPCE):
return "UPCE"
if(code.type() == image.ISBN10):
return "ISBN10"
if(code.type() == image.UPCA):
return "UPCA"
if(code.type() == image.EAN13):
return "EAN13"
if(code.type() == image.ISBN13):
return "ISBN13"
if(code.type() == image.I25):
return "I25"
if(code.type() == image.DATABAR):
return "DATABAR"
if(code.type() == image.DATABAR_EXP):
return "DATABAR_EXP"
if(code.type() == image.CODABAR):
return "CODABAR"
if(code.type() == image.CODE39):
return "CODE39"
if(code.type() == image.PDF417):
return "PDF417"
if(code.type() == image.CODE93):
return "CODE93"
if(code.type() == image.CODE128):
return "CODE128"
while(True):
clock.tick()
img = sensor.snapshot()
codes = img.find_barcodes()
for code in codes:
img.draw_rectangle(code.rect())
print_args = (barcode_name(code), code.payload(), (180 * code.rotation()) / math.pi, code.quality(), clock.fps())
print("Barcode %s, Payload \"%s\", rotation %f (degrees), quality %d, FPS %f" % print_args)
if not codes:
print("FPS %f" % clock.fps())
Singtown Technology OpenMV official Chinese document function explanation: