为什么识别到人脸的时候没有显示框?测量温度偏低怎么解决?
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import sensor, image, time, fir, lcd from pid import PID from pyb import Servo pan_servo=Servo(1) tilt_servo=Servo(2) pan_servo.calibration(500,2500,500) tilt_servo.calibration(500,2500,500) red_threshold = (13, 49, 18, 61, 6, 47) pan_pid = PID(p=0.07, i=0, imax=90) #脱机运行或者禁用图像传输,使用这个PID tilt_pid = PID(p=0.05, i=0, imax=90) #脱机运行或者禁用图像传输,使用这个PID #pan_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID #tilt_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID ALT_OVERLAY = False # 设置为True分配第二个ir图像 sensor.reset() # Initialize the camera sensor. sensor.set_pixformat(sensor.RGB565) # use RGB565. sensor.set_framesize(sensor.QQVGA2) # use QQVGA for speed. sensor.skip_frames(time = 2000) # Let new settings take affect. sensor.set_auto_whitebal(False) # turn this off. fir.init(type=fir.FIR_AMG8833) # 初始化lcd lcd.init() # 为更流畅的视频分配另一个帧缓冲。 extra_fb = sensor.alloc_extra_fb(sensor.width(), sensor.height(), sensor.RGB565) clock = time.clock() # Tracks FPS. face_cascade = image.HaarCascade("frontalface", stages=25) def find_max(blobs): max_size=0 for blob in blobs: if blob[2]*blob[3] > max_size: max_blob=blob max_size = blob[2]*blob[3] return max_blob while(True): clock.tick() # Track elapsed milliseconds between snapshots(). img = sensor.snapshot() # Take a picture and return the image. faces = img.find_features(face_cascade, threshold=0.5, scale=1.25) if faces: face = find_max(faces) cx = int(face[0]+face[2]/2) cy = int(face[1]+face[3]/2) pan_error = cx-img.width()/2 tilt_error = cy-img.height()/2 print("pan_error: ", pan_error) img.draw_rectangle(face) # rect img.draw_cross(cx, cy) # cx, cy pan_output=pan_pid.get_pid(pan_error,1) tilt_output=tilt_pid.get_pid(tilt_error,1) print("pan_output",pan_output) pan_servo.angle(int(pan_servo.angle()+pan_output)) tilt_servo.angle(int(tilt_servo.angle()+tilt_output)) ta, ir, to_min, to_max = fir.read_ir() if not ALT_OVERLAY: # 缩放图像并使用framebuffer进行绑定 fir.draw_ir(img, ir) else: # 创建一个副图像,然后混合到帧缓冲区中。 extra_fb.clear() fir.draw_ir(extra_fb, ir, alpha=256) img.blend(extra_fb, alpha=128) # 绘制环境温度、最小温度和最大温度。 img.draw_string(8, 0, "Ta: %0.2f C" % ta, color = (255, 0, 0), mono_space = False) img.draw_string(8, 8, "To min: %0.2f C" % to_min, color = (255, 0, 0), mono_space = False) img.draw_string(8, 16, "To max: %0.2f C"% to_max, color = (255, 0, 0), mono_space = False) lcd.display(img) # Force high quality streaming... # 强制高质量流… img.compress(quality=90) # 打印FPS print(clock.fps())!
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你的画面就没有人脸啊。你把红外热图覆盖上了,人脸肯定看不到。