1. Lighting conditions. Most of the endoscopes are illuminated by the light source of the endoscope. Under general conditions, it is required that the color temperature of the light source detected by the endoscope shall not be lower than 5600k, and the illumination intensity shall not be lower than 2600lm. Weile video endoscope comes with 12 super bright LED light source.

2.探頭位置與角度。通常在距離檢測區域5~25mm范圍內觀察圖像的效果，因此往往需要內窺鏡探頭盡量靠近觀測點。探頭與觀測物平面在45°~90°范圍內都可以達到較好的觀測效果，在實際工作中是通過反復改變探頭與觀察點的位置與角度找到合適的觀察位置，并獲得的檢測效果。

2. Probe position and angle. Generally, the best effect is to observe the image in the range of 5-25 mm from the detection area, so the endoscopic probe is often required to be as close to the observation point as possible. Both the probe and the observation plane can achieve better observation effect in the range of 45 ° ~ 90 °. In the actual work, it is through changing the position and angle of the probe and the observation point repeatedly to find the appropriate observation position and obtain the best detection effect.

3.通道。選擇通道時應盡量靠近需要檢測位置，選擇進入長度短的通道，盡量減少探頭需要彎曲的次數及程度；考慮由上到下，由高到低的通道；優先選擇寬闊的通道；使用工裝，保證探頭在產品通道中的正確方向；應采用邊觀察邊通過的方法在通道中行進。

3. Access. When selecting the channel, try to be close to the position to be detected, select the channel with the shortest length to enter, and try to reduce the number and degree of the probe to be bent; first, consider the channel from top to bottom, from high to low; give priority to the wide channel; recommend the use of tooling to ensure the correct direction of the probe in the product channel; adopt the method of observing and passing in the channel.

4.圖像的畸變。通過透鏡觀察物體產生的變形現象，隨著從透鏡中心到邊緣距離的增大，圖像發生畸變。圖像的畸變會對缺陷的判斷及測量產生影響。直桿鏡、光纖鏡觀察是圖像的畸變較大，視頻內窺鏡可通過計算機進行校正。

4. Image distortion. The deformation phenomenon of the object is observed through the lens. With the increase of the distance from the center to the edge of the lens, the image is distorted. The distortion of image will affect the judgment and measurement of defects. The distortion of the image observed by the straight rod mirror and the optical fiber mirror is large, and the video endoscope can be corrected by the computer.

5.分辨率、放大倍數、可檢測小缺陷。這些都是內窺鏡自身的技術指標，可直接影響到探測的結果。

5. Resolution, magnification, and detectable minimum defects. These are the technical indicators of endoscope itself, which can directly affect the detection results.

6.物體表面的反射率。不同的物體表面有不同的反射率，和物體的材料和表面的粗糙程度都有關系。因此，實際檢測時應該根據具體的情況選擇內窺鏡照明的強度以便得到清晰有用的結果。

6. Reflectivity of the object surface. Different surfaces have different reflectivity, which is related to the material and roughness of the surface. Therefore, in order to get clear and useful results, the intensity of endoscopic illumination should be selected according to the actual situation.

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