How do WiFi Camera Work ?
Monitoring cameras can also be installed without a network, but some functions cannot be used, such as remote monitoring. In order to make it easier for you to understand the knowledge related to the surveillance camera, I will use popular language to popularize science for you.
1: Camera introduction
Camera is an intelligent device that can capture and record video and monitor the environment in real time. It can not only record video, but also detect moving objects, sound, smoke, and even recognize faces.
The advantages of the camera are very obvious. It can help people better monitor the safety of their homes or offices, and help protect the safety of family members or office staff. In addition, it can also provide real-time video monitoring, provide more security guarantees, and help people better grasp the current security situation.
Among them, "intelligent camera" is a new technology in recent years, which can monitor the environment in real time and conduct intelligent identification. The intelligent camera adopts high-definition camera technology, which can clearly capture the on-site images within the monitoring range and conduct real-time monitoring. It can also analyze the captured pictures to identify the designated person or object, thus realizing intelligent monitoring.
In addition, the smart camera can also support remote monitoring. You can remotely view the real-time image of the camera through your mobile phone or computer, allowing users to view the image of the camera anytime and anywhere, to better protect the security of your home or office.
At present, cameras have been widely used in the security industry to monitor buildings, parks, schools and other places to protect the safety of the people. It can also be used in commercial places to help businesses achieve intelligent management, improve business environment and improve service quality.
2: Working principle of camera
The working principle of the camera is to reflect the light to the sensor, convert the signal captured by the sensor into a digital signal, and finally send it to the computer to display the image. Then the camera can capture the static and dynamic images in the picture.
The sensor of the camera is the most important part. It can capture light and convert it into electrical signals. There are many types of sensors, the most common are CCD and CMOS sensors, which can be used to capture images.
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Greenhouse vegetables guard against "eight evils"
Fertilizer harm: The harm caused by improper fertilizer application to vegetable seedlings. The initial stage of fertilizer damage starts from the lower leaves and wilts at noon. It can be recovered sooner or later, and it is also difficult to recover in severe cases sooner or later. The reason for this is that the nutrient soil is mixed with excessively quantified fertilizer or unfabricated livestock and poultry manure, causing excessively high soil moisture penetration pressure. Roots are difficult to absorb and "burn". Prevention should be based on prevention. In the preparation of nutritious soil to use mashed sifted, fully cooked organic fertilizer, and in strict accordance with the technical requirements, top dressing must be combined with watering. In the event of fertilizer damage, immediately flood the water to reduce or alleviate the symptoms. Pharmacy damage: Solar greenhouse vegetable production due to small space, good airtight, improper use of pesticides are prone to injury. Some bactericidal agents such as mancozeb, chlorothalonil, antivirus, etc., will cause phytotoxicity if they are too concentrated. In addition, some vegetables are very sensitive to some insecticides, even if they are used in small amounts, serious injury may also occur. In the event of a phytotoxicity, spraying of “vegetative power 2003†and other nutraceuticals can relieve the phytotoxicity. Ammonia damage: Ammonia damage is a hazard to vegetables when the concentration of ammonia in the air in a greenhouse reaches a certain level. In the case of ammonia damage to vegetables, the leaves are often wilting, withering and burning. The prevention and control method is firstly to select the combination of water and fertilizer in continuous sunny days, and the cake fertilizer and other organic fertilizers should be turned into the soil in time. The second is to promptly ventilate fertilizers to prevent ammonia accumulation. A pH test paper can be used to measure the ammonia content in the greenhouse. Use pH test paper to dip the water droplets on the film. When the pH value is >7, it indicates the presence of ammonia gas. When pH ≤ 7, there is no ammonia gas in the greenhouse. Cold damage and heat damage: Solar greenhouse production does not pay attention to insulation and humidification can cause cold damage, the temperature is too high and easy to cause heat damage. Generally, as long as the conventional insulation measures are implemented, the temperature in the greenhouse will not be lower than 0°C without directly freezing the vegetable seedlings, but some thermophilic vegetables such as cucumber and eggplant will appear when the night temperature is lower than 8°C for 5 consecutive days. Cold roots, which in turn cause dead roots. Heat damage is mostly caused by man-made reasons. For example, if the sky is not paid attention at noon on sunny days, the temperature in the greenhouse may be as high as 40° C., and the seedlings may be dehydrated and dried up. As long as you look at the thermometer diligently, if you exceed the required temperature, you will not be exposed to heat and you will not suffer heat damage. Diseases: The temperature in the solar greenhouse is high and the humidity is high, which is favorable for various diseases. In practice, prevention and control of diseases adopt agricultural control and chemical prevention and control measures. The adoption of agricultural measures such as planting disease-resistant varieties, increasing organic fertilizers, ridge cultivation, air release, buckled film, and subsurface dark irrigation will reduce the occurrence of diseases. Flash seedlings: The weather was chilly for a few days, and it was eager to open the grass seedlings. It often caused the plants to wilted, and even the whole plant died. The people commonly called them “flash seedlingsâ€. To prevent “flash seedlingsâ€, first, we must insist on pulling the straw curtains during the cloudy days. We can pull them in early and late, and we can roll the grasshoppers about 1 meter in front of the front slope of the greenhouse and in the back of the slope to allow the seedlings to accept some cold weather. Scattered light; Second, after the weather is fine, in the morning the sun comes out until 10 o'clock before drafting all the quails, not letting go. After 10 o'clock, when the sun increases, it will lay down half of the grass weeds. If the pods are burping, they can spray clean water on the vegetable seedlings. , increase the humidity of the air in the greenhouse to prevent the leaves from losing water. This should be observed continuously for 2-3 days, until the seedlings adapt to the sunny days before they can be transferred to normal management. Harm: Harm is the harm caused by harmful gases to greenhouse vegetables. Hazardous gases are mostly caused by human factors, such as coal fires in the greenhouse or burning of firewood to produce large amounts of smoke and SO2 gas. Excessive doses of aerosolized pesticides can also cause damage to vegetable seedlings. To prevent gas damage, one must use a chimney to warm the greenhouse to prevent harmful gases from entering the greenhouse. The second is to strictly determine the amount of medication according to the instructions for use of the drug when it is smoked. Do not blindly increase the dose. Herbicide Harm: Vegetable seedlings are extremely sensitive to various herbicides. Misuse of herbicides, removal of turfgrass, or use of sprayers sprayed with herbicides can cause seedling damage. It is difficult to remedy the damage of vegetables caused by herbicides. Even if it can restore growth, it will result in reduced yields. Therefore, it is necessary to increase vigilance and prevent the use of herbicides, turf-membrane, and sprayers that have sprayed herbicides.