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Add a sample for Pi Camera
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‎samples/test_DecodeVideoByPiCamera.py‎

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import os
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import sys
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import time
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import io
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import numpy as np
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from picamera import PiCamera
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from picamera.array import PiRGBArray
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from dbr import *
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import cv2
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# you can change the following variables' value to your own value.
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license_key = "Input your own license"
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json_file = r"Please input your own template path"
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reader = BarcodeReader()
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def intermediate_results_callback_func(frame_id, i_results, user_data):
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print(frame_id)
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for result in i_results:
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intermediate_result = IntermediateResult(result)
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print('Intermediate Result data type : {0}'.format(intermediate_result.result_type))
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print('Intermediate Result data : {0}'.format(intermediate_result.results))
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print("-------------")
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## Or you can inherit the abstract class IntermediateResultCallBack to implement the abstract method intermediate_results_callback_func.
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# class SubIntermediateResultCallBack(IntermediateResultCallBack):
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# @staticmethod
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# def intermediate_results_callback_func(frame_id, i_results, user_data):
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# print(frame_id)
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# for result in i_results:
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# intermediate_result = IntermediateResult(result)
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# print('Intermediate Result data type : {0}'.format(intermediate_result.result_type))
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# print('Intermediate Result data : {0}'.format(intermediate_result.results))
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# print("-------------")
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def text_results_callback_func(frame_id, t_results, user_data):
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print(frame_id)
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for result in t_results:
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text_result = TextResult(result)
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print("Barcode Format : ")
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print(text_result.barcode_format_string)
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print("Barcode Text : ")
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print(text_result.barcode_text)
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print("Localization Points : ")
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print(text_result.localization_result.localization_points)
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print("Exception : ")
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print(text_result.exception)
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print("-------------")
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## Or you can inherit the abstract class TextResultResultCallBack to implement the abstract method text_results_callback_func.
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# class SubTextResultResultCallBack(TextResultResultCallBack):
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# @staticmethod
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# def text_results_callback_func(frame_id, t_results, user_data):
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# print(frame_id)
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# for result in t_results:
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# text_result = TextResult(result)
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# print("Barcode Format : ")
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# print(text_result.barcode_format_string)
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# print("Barcode Text : ")
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# print(text_result.barcode_text)
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# print("Localization Points : ")
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# print(text_result.localization_result.localization_points)
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# print("Exception : ")
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# print(text_result.exception)
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# print("-------------")
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def error_callback_func(frame_id, error_code, user_data):
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print(frame_id)
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error_msg = user_data.get_error_string(error_code)
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print('Error : {0} ; {1}'.format(error_code, error_msg))
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## Or you can inherit the abstract class ErrorCallBack to implement the abstract method error_callback_func.
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# class SubErrorCallBack(ErrorCallBack):
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# @staticmethod
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# def error_callback_func(frame_id, error_code, user_data):
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# print(frame_id)
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# error_msg = user_data.get_error_string(error_code)
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# print('Error : {0} ; {1}'.format(error_code, error_msg))
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def get_time():
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localtime = time.localtime()
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capturetime = time.strftime("%Y%m%d%H%M%S", localtime)
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return capturetime
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def read_barcode():
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video_width = 0
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video_height = 0
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# vc = cv2.VideoCapture(0)
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camera = PiCamera()
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camera.resolution = (1024, 1024) # Set image's width and height
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# SetPiCameraParameters(camera):
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# camera.saturation = 80 # Video or Image saturation
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# camera.brightness = 50 # Video or Image brightness
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# camera.shutter_speed = 6000000 # The shutter speed
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# camera.iso = 800 # ISO
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# camera.sharpness = 0 # Image Sharpness
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# camera.hflip = True # Whether to flip horizontally
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# camera.vflip = True # Whether to flip vertically
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# camera.rotation = 0 # Whether to rotate image
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# camera.resolution = (280, 160) # Set image's width and height
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video_width = camera.resolution[0]
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video_height = camera.resolution[1]
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print(camera.resolution)
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stride = 0
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stream = io.BytesIO()
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camera.capture(stream, format='jpeg')
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# 从流构建numpy
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data = np.frombuffer(stream.getvalue(), dtype=np.uint8)
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# 通过opencv解码numpy
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image = cv2.imdecode(data, 1)
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stride = image.strides[0]
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print(stride)
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rawCapture = PiRGBArray(camera, size=(video_width, video_height))
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windowName = "Barcode Reader"
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parameters = reader.init_frame_decoding_parameters()
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# you can modify these following parameters.
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parameters.max_queue_length = 30
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parameters.max_result_queue_length = 30
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parameters.width = video_width
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parameters.height = video_height
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parameters.stride = stride
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parameters.image_pixel_format = EnumImagePixelFormat.IPF_RGB_888
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parameters.region_top = 0
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parameters.region_bottom = 100
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parameters.region_left = 0
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parameters.region_right = 100
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parameters.region_measured_by_percentage = 1
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parameters.threshold = 0.01
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parameters.fps = 0
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parameters.auto_filter = 1
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reader.start_video_mode(parameters, text_results_callback_func)
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# reader.start_video_mode(parameters, SubTextResultResultCallBack.text_results_callback_func)
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## You can use three callbacks at the same time.
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# reader.start_video_mode(parameters, text_results_callback_func, "", intermediate_results_callback_func, error_callback_func, reader)
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# reader.start_video_mode(parameters, SubTextResultResultCallBack.text_results_callback_func, "", SubIntermediateResultCallBack.intermediate_results_callback_func, SubErrorCallBack.error_callback_func, reader)
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for frame in camera.capture_continuous(rawCapture, format='bgr', use_video_port=True):
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image = frame.array
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try:
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ret = reader.append_video_frame(image)
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except:
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pass
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# 'ESC' for quit
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key = cv2.waitKey(1)
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rawCapture.truncate(0)
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if key == 27:
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break
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reader.stop_video_mode()
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cv2.destroyWindow(windowName)
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print("-------------------start------------------------")
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# Apply for a trial license: https://www.dynamsoft.com/customer/license/trialLicense?product=dbr&utm_source=github
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reader.init_license(license_key)
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## The code snippet below shows how to use the full license in DBR 8.x:
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# connection_paras = BarcodeReader.init_lts_connection_parameters()
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## If DBR service is already built on your server, you can fill in the address of your server, or leave this property's default value.
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# connection_paras.main_server_url = "Input your own server url"
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# connection_paras.handshake_code = "Input your own handshake"
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# connection_paras.deployment_type = EnumDMDeploymentType.DM_DT_DESKTOP
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# connection_paras.uuid_generation_method = EnumDMUUIDGenerationMethod.DM_UUIDGM_RANDOM
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# try:
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# error = BarcodeReader.init_license_from_lts(connection_paras)
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# if error[0] != EnumErrorCode.DBR_OK:
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# print(error[1])
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# except BarcodeReaderError as bre:
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# print(bre)
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error = reader.init_runtime_settings_with_file(json_file)
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if error[0] != EnumErrorCode.DBR_OK:
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print(error[1])
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read_barcode()
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print("-------------------over------------------------")

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