Photosensitive element

Sensor module, used to set the parameters of the photosensitive element.

For example:

import sensor#引入感光元件的模块

# 设置摄像头
sensor.reset()#初始化感光元件
sensor.set_pixformat(sensor.RGB565)#设置为彩色
sensor.set_framesize(sensor.QVGA)#设置图像的大小
sensor.skip_frames()#跳过n张照片，在更改设置后，跳过一些帧，等待感光元件变稳定。

# 一直拍照
while(True):
    img = sensor.snapshot()#拍摄一张照片，img为一个image对象

Initialization

• sensor.reset() initializes the photosensitive element

Set color/black and white

• sensor.set_pixformat() sets the pixel mode.
  • sensor.GRAYSCALE: grayscale, 8 bits per pixel.
  • sensor.RGB565: color, 16 bits per pixel.

Set the image size

• sensor.set_framesize() Set the image size
  • sensor.QQCIF: 88x72
  • sensor.QCIF: 176x144
  • sensor.CIF: 352x288
  • sensor.QQSIF: 88x60
  • sensor.QSIF: 176x120
  • sensor.SIF: 352x240
  • sensor.QQQQVGA: 40x30
  • sensor.QQQVGA: 80x60
  • sensor.QQVGA: 160x120
  • sensor.QVGA: 320x240
  • sensor.VGA: 640x480
  • sensor.HQQQVGA: 80x40
  • sensor.HQQVGA: 160x80
  • sensor.HQVGA: 240x160
  • sensor.B64X32: 64x32 (for frame difference image.find_displacement())
  • sensor.B64X64: 64x64 for frame difference image.find_displacement())
  • sensor.B128X64: 128x64 (for frame difference image.find_displacement())
  • sensor.B128X128: 128x128 (for frame difference image.find_displacement())
  • sensor.LCD: 128x160 (for LCD expansion board)
  • sensor.QQVGA2: 128x160 (for LCD expansion board)
  • sensor.WVGA: 720x480 (for MT9V034)
  • sensor.WVGA2:752x480 (for MT9V034)
  • sensor.SVGA: 800x600 (for OV5640 sensor only)
  • sensor.XGA: 1024x768 (for OV5640 sensor only)
  • sensor.SXGA: 1280x1024 (for OV5640 sensor only)
  • sensor.UXGA: 1600x1200 (for OV5640 sensor only)
  • sensor.HD: 1280x720 (for OV5640 sensor only)
  • sensor.FHD: 1920x1080 (for OV5640 sensor only)
  • sensor.QHD: 2560x1440 (for OV5640 sensor only)
  • sensor.QXGA: 2048x1536 (OV5640 sensor only)
  • sensor.WQXGA: 2560x1600 (OV5640 sensor only)
  • sensor.WQXGA2: 2592x1944 (OV5640 sensor only)

Skip some frames

• sensor.skip_frames(n=10) Skip n photos. After changing the settings, skip some frames and wait for the sensor to stabilize.

Get an image

• sensor.snapshot() Take a photo and return an image object.

Automatic gain/white balance/exposure

• sensor.set_auto_gain() Automatic gain on (True) or off (False). When using color tracking, you need to turn off automatic gain.

• sensor.set_auto_whitebal() Automatic white balance on (True) or off (False). When using color tracking, you need to turn off automatic white balance.

• sensor.set_auto_exposure(enable[\, exposure_us])

  • enable turns auto exposure on (True) or off (False). On by default.
  • If enable is False, exposure_us can be used to set a fixed exposure time (in microseconds).

Set window ROI

sensor.set_windowing(roi)

ROI: Region Of Interest, the term "region of interest" in image processing. It is the region to be processed extracted from the image to be processed.\

sensor.set_framesize(sensor.VGA) # 高分辨率
sensor.set_windowing((640, 80)) #取中间的640*80区域

The format of roi is (x, y, w, h). See using statistics

Set flip

sensor.set_hmirror(True)\ Horizontal flip

sensor.set_vflip(True)\ Vertical flip

For more sensor settings, see the official Chinese documentation of OpenMV: https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.sensor.html