Video conferencing is an organic combination of images and sounds. In order to achieve the desired results, pre-preparation and debugging work must be done in accordance with the operating procedures. There are still many unsatisfactory places in practical applications, mainly in terms of parameter settings and actual operations. How to do your best and be comfortable? This article discusses related technical issues and proposes different solutions and application techniques.
In the video debugging process, the common problem is that the image is achromatic and the image is color cast. For the image achromatic phenomenon, it can be solved by the parameter setting in the conference terminal control software; for the image color cast phenomenon, the white color balance adjustment is used to correct the image color cast caused by the color temperature change of the light source. Mixed light (indoor lighting source, direct sunlight and scattering of outdoor sunlight) should be avoided as the illumination source in the venue. Mixed light sources with different color temperatures will not achieve ideal color reproduction. Therefore, it is necessary to avoid two or more types in the venue. Light sources of different color temperatures. If you use a video conferencing camera, you can use the restart method to eliminate it; if you use a professional camera, you can solve it by white balance adjustment. The specific method is: select the appropriate color temperature filter according to the color temperature of the venue illumination source, adopt automatic white balance. Adjust to ensure accurate color reproduction.
During the meeting, it is necessary to display the pictures of the local venues. If the venue uses "push", "pull", and "shake" techniques to shoot, the specific problems are that the motion picture is incoherent, the movement speed is uneven, and the movement is uneven. The picture is not in place. "Push" is to gradually close the line of sight to the subject, from the whole to the local, highlighting a part of the whole; "pull" is from the local to the whole, indicating the environment in which a part is located; "shake" is divided into left Shake and shake right. “Push†and “Pull†are close-up, close-up, medium-range, and panoramic images in the same lens, emphasizing the size of the frame. Therefore, the frame composition of the frame is especially important. This is the standard for measuring whether the picture is in place. Regardless of the shooting technique used, it is necessary to ensure the stability and continuity of the picture. The stable picture should be used as the starting position, and the stable picture should be used as the frame. It must be long enough to ensure the relative stillness of the picture. This is what people need for psychological requirements and lens assembly. Unintentional slamming, slamming, sudden shifting, and stopping in the middle of the game will cause the viewer to feel a sense of visual anomaly and turbulence, mainly due to operational errors and lag effects.
For the control using the conference terminal control software, it should be performed manually. For example, if you want to “push†(or pull) the action, first construct the frame of the frame, then “pull†(or push) to the panorama. When the master control room switches to the local screen, press the mouse again. Loosen the mouse at the falling position; if you want to perform the "shake" action, first construct the frame of the falling frame. When the general control room switches to the picture of the local end, press the mouse to make a left or right shake, loose at the falling position. Open the mouse. However, in actual operation, due to the limitation of the camera position, the falling screen of the "shake" action is not ideal. For professional camcorder control, use the power zoom mode, press T (push) or W (pull) to complete the required shooting skills. Since the speed of the zoom button can be changed to change the speed of the zoom within a certain range, the force of pressing the zoom button should be uniform, otherwise the zooming process cannot be performed at a constant speed.
It is worth noting that video conferencing has a lag effect on the picture, and the operator is prone to illusion when performing "push" or "pull" or "shake" actions. For example, when the general control room switches to the screen of the local end, the operator starts the action of “pushing†or “pull†or “shakeâ€, but the change process of the action is not immediately displayed in the far-end picture, and it is wrong. I think that there is an error in the action, and the process of the action is stopped, causing the motion picture to stop in the middle. In the blink of an eye, when the changed picture appears in the far-end picture, the operator confirms that the action has not been mistaken, and continues. The original action, until the frame is dropped. This process of stopping motion caused the motion picture to be incoherent. In addition, the composition of the falling screen at this time and the originally envisioned composition have been advanced. For the "push" action, the picture has transitioned from a close-up to a close-up; for a "pull" action, the picture has transitioned from a panoramic view to a large panorama; for a "shake" action, the falling picture has been shaken to the edge of the venue. It is because of the lag effect of the picture that the screen is not in place.
The problem caused by the image delay effect can be solved by the following method: the first step is to monitor the remote screen first, and when the control room switches to the local screen, immediately move the line of sight to the screen of the monitoring end, and The "push" or "pull" or "shake" action is performed using the local screen as a reference. In the video conference of "National Organization System", which talks about party spirit, heavy product behavior, and performance rate, the author uses the conference terminal control software to adopt the above method to complete the "push" action and achieve continuous motion of the picture. The purpose of uniform speed and framed composition is in place.
Battery is the energy source of AGV car, and also relates to the service life of AGV car.Common battery types for AGV vehicles include nickel-cadmium battery, nickel-metal hydride battery, lithium battery and lead-acid battery, which have the following characteristics:
The nickel-cadmium battery used in AGV car has large internal resistance and can be used for large current discharge.
2. Nimh battery
It offers higher capacity at the same price as nickel-cadmium batteries, less pronounced memory effects, and lower environmental pollution.
3. Lithium battery
"Lithium battery" is a kind of battery with lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution. Because lithium battery has the characteristics of high energy density, high voltage and stable operation, it is widely used.
4, lead acid battery
The electrodes are mainly made of lead and its oxides, and the electrolyte is a kind of battery with sulfuric acid solution.Lead-acid battery has the advantages of good invertibility, stable voltage characteristics, long service life, wide application range, abundant raw materials, renewable use and low cost.
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