[ Huaqiang Security Network News ] It is understood that with the growth of the sales of millions of cameras, the megapixel lens has also grown rapidly, but in the face of the megapixel cameras of various manufacturers, how do users choose the one that suits them? What about the lens? I hope that after reading this article on megapixel lenses, it will help you how to choose a megapixel lens. 
Megapixel lens features <br> At present, megapixel lenses are commonly used in fixed focus, manual zoom, power zoom and so on. For different industry applications, there are basically mature application solutions. For example, in the field of traffic capture, a fixed-focus megapixel lens is commonly used. What is the difference between a megapixel lens and a normal lens?
Difference in sharpness <br> The resolution of the lens at the center of the imaging surface is the highest, and the image at the edge is relatively poor. Ordinary lens can reduce the sharpness of the edge while the central resolution can basically meet the definition. The overall resolution can meet the requirements of 440,000 pixels of ordinary cameras.
In fact, there are three key factors that determine the clarity of the lens: 1. Lens material and purity. The less impurities of the lens, the less interference light it produces, the higher the picture clarity; 2. The precision of the lens. The grinding precision of the lens is determined by the grinding equipment. At present, the difference between the domestic lens and the foreign lens is reflected in this point; 3. The coating precision of the lens. Precise control of the coating process is also one of the determinants of lens clarity.
In addition, the megapixel lens uses aspherical lenses to reduce aberrations and achieve a miniaturized design while improving clarity relative to ordinary lenses. The image quality is achieved from the center of the image to the peripheral part through special optical design techniques. The high resolution and high-contrast images increase the resolution by more than 2.5 times than the conventional lens, ensuring high image quality even when the image is cut or enlarged.
Difference in spectral transmission capability<br> The spectral transmission capability of the lens also contributes to the improvement of picture clarity. The transmission of wide frequency light will greatly increase the amount of light received by the camera's target surface. It enhances the contrast and brightness of the picture and enriches the details of the picture.
Differences in spectral correction ability Only wide-spectrum transmission ability is not enough for high-definition imaging. If the lens's spectral correction ability is insufficient, it will cause some wavelengths of light to be not accurately imaged on the camera target surface, resulting in the generation of virtual images. This technique is not possible with ordinary lenses through coating.
How to choose a megapixel lens <br> Compared with a normal lens, a megapixel lens has unparalleled features and advantages, but what should we pay attention to when choosing a megapixel lens?
Sharpness Correspondence <br> HD cameras have just entered the market, and the resolution is often around 1 million pixels. Users often feel that the megapixel lens is too expensive. The HD camera is equipped with a standard-definition lens, and the effect is ok, and the clarity of the standard-definition system has been greatly improved. However, in many systems, the picture will be blurred, especially if the center of the picture is clear and the edges are blurred. This can not be achieved by debugging. With 2 million, 3 million, and 5 million cameras entering the market, users have gradually learned about megapixel lenses and began to rationally select the right lens based on the camera.
The megapixel lens is divided from the definition. The common ones are 1.3 million pixels, 2 million pixels, and 3 million pixels. The high-end products have 5 million pixels, and some excellent manufacturers have already achieved 10 million pixels. Then, when selecting a lens, select the lens product with the same or higher than the pixel according to the highest resolution of the camera. For example, a 2 megapixel capture CCD camera commonly used in transportation should select a 25mm or 35mm product corresponding to 2 million pixels according to the actual application environment. The resolution of the current common power zoom lens is generally 1.3 million pixels, and the demand for telephoto and high-definition lenses is diverse. For more than 2 million high-definition cameras, you should choose a high-definition motorized zoom lens that corresponds to its clarity, so the corresponding product of more than 2 million is the first choice. Of course, higher definition products should choose higher pixel lenses, such as 3 million, 5 million corresponding products.
According to the camera application, select the product that matches the function. In some projects, the camera needs to cooperate with the infrared fill light during use. Then you should use the IR-enabled lens, so that you can get a brighter picture at night, and also reduce the nighttime virtual focus. The problem. For more demanding environments, such as laser light, for long-distance target monitoring, it is necessary to ensure that the non-visible wavelength can still reach more than 60% transmission at 900um.
Using the auto focus function lens to solve the delay problem Most HD cameras on the market currently use IP mode output, that is, the code is completed inside the camera. After being transmitted over the network, it needs to be decoded in the monitoring center to be displayed on the screen. Everyone knows that the camera will cause delay in the encoding process. Similarly, the network transmission will delay, and the monitoring center decoding process will also create a delay. Therefore, the more devices and the more forwarding times, the delay will be. The longer these delays are added together, the more serious the monitoring personnel will be. For fixed-focus products, this part of the delay has a relatively small impact. For systems with motorized zoom lenses, the use of cymbals is brought about. On the one hand, the high-definition system, on the one hand, due to the delay stack mentioned above, will cause the picture to always be unfocused, or the focus time is too long to quickly capture the target. In this case, choose a product with auto focus. With the automatic focusing lens, the focusing process is automatically completed at the front end, so that the picture transmitted back to the center is always clear, which can bring the following advantages to the HD system: 1. Reduce the operator's focusing operation on the lens and prolong the service life of the motor. 2, because the picture is always clear, the camera can have higher efficiency and higher compression ratio when encoding, reducing the resource consumption of transmission and storage; 3, shortening the target capture time, so that the monitoring personnel can be in unit time Browse more screens to improve the effectiveness of the monitoring system.
With the popularity of high-definition cameras, more and more systems require the access of high-definition lenses. All major lens manufacturers have introduced high-definition products with different focal lengths, giving users more choices. With the application of ED lenses, auto focus and other functions in high-definition lenses, the difference between high-definition motorized zoom lenses and standard-definition products is getting smaller and smaller. The future trend will be the integration of products, HD products will gradually replace the existing standard definition products, and become the mainstream of the market.
Difference in sharpness <br> The resolution of the lens at the center of the imaging surface is the highest, and the image at the edge is relatively poor. Ordinary lens can reduce the sharpness of the edge while the central resolution can basically meet the definition. The overall resolution can meet the requirements of 440,000 pixels of ordinary cameras.
In fact, there are three key factors that determine the clarity of the lens: 1. Lens material and purity. The less impurities of the lens, the less interference light it produces, the higher the picture clarity; 2. The precision of the lens. The grinding precision of the lens is determined by the grinding equipment. At present, the difference between the domestic lens and the foreign lens is reflected in this point; 3. The coating precision of the lens. Precise control of the coating process is also one of the determinants of lens clarity.
In addition, the megapixel lens uses aspherical lenses to reduce aberrations and achieve a miniaturized design while improving clarity relative to ordinary lenses. The image quality is achieved from the center of the image to the peripheral part through special optical design techniques. The high resolution and high-contrast images increase the resolution by more than 2.5 times than the conventional lens, ensuring high image quality even when the image is cut or enlarged.
Difference in spectral transmission capability<br> The spectral transmission capability of the lens also contributes to the improvement of picture clarity. The transmission of wide frequency light will greatly increase the amount of light received by the camera's target surface. It enhances the contrast and brightness of the picture and enriches the details of the picture.
Differences in spectral correction ability Only wide-spectrum transmission ability is not enough for high-definition imaging. If the lens's spectral correction ability is insufficient, it will cause some wavelengths of light to be not accurately imaged on the camera target surface, resulting in the generation of virtual images. This technique is not possible with ordinary lenses through coating.
How to choose a megapixel lens <br> Compared with a normal lens, a megapixel lens has unparalleled features and advantages, but what should we pay attention to when choosing a megapixel lens?
Sharpness Correspondence <br> HD cameras have just entered the market, and the resolution is often around 1 million pixels. Users often feel that the megapixel lens is too expensive. The HD camera is equipped with a standard-definition lens, and the effect is ok, and the clarity of the standard-definition system has been greatly improved. However, in many systems, the picture will be blurred, especially if the center of the picture is clear and the edges are blurred. This can not be achieved by debugging. With 2 million, 3 million, and 5 million cameras entering the market, users have gradually learned about megapixel lenses and began to rationally select the right lens based on the camera.
The megapixel lens is divided from the definition. The common ones are 1.3 million pixels, 2 million pixels, and 3 million pixels. The high-end products have 5 million pixels, and some excellent manufacturers have already achieved 10 million pixels. Then, when selecting a lens, select the lens product with the same or higher than the pixel according to the highest resolution of the camera. For example, a 2 megapixel capture CCD camera commonly used in transportation should select a 25mm or 35mm product corresponding to 2 million pixels according to the actual application environment. The resolution of the current common power zoom lens is generally 1.3 million pixels, and the demand for telephoto and high-definition lenses is diverse. For more than 2 million high-definition cameras, you should choose a high-definition motorized zoom lens that corresponds to its clarity, so the corresponding product of more than 2 million is the first choice. Of course, higher definition products should choose higher pixel lenses, such as 3 million, 5 million corresponding products.
According to the camera application, select the product that matches the function. In some projects, the camera needs to cooperate with the infrared fill light during use. Then you should use the IR-enabled lens, so that you can get a brighter picture at night, and also reduce the nighttime virtual focus. The problem. For more demanding environments, such as laser light, for long-distance target monitoring, it is necessary to ensure that the non-visible wavelength can still reach more than 60% transmission at 900um.
Using the auto focus function lens to solve the delay problem Most HD cameras on the market currently use IP mode output, that is, the code is completed inside the camera. After being transmitted over the network, it needs to be decoded in the monitoring center to be displayed on the screen. Everyone knows that the camera will cause delay in the encoding process. Similarly, the network transmission will delay, and the monitoring center decoding process will also create a delay. Therefore, the more devices and the more forwarding times, the delay will be. The longer these delays are added together, the more serious the monitoring personnel will be. For fixed-focus products, this part of the delay has a relatively small impact. For systems with motorized zoom lenses, the use of cymbals is brought about. On the one hand, the high-definition system, on the one hand, due to the delay stack mentioned above, will cause the picture to always be unfocused, or the focus time is too long to quickly capture the target. In this case, choose a product with auto focus. With the automatic focusing lens, the focusing process is automatically completed at the front end, so that the picture transmitted back to the center is always clear, which can bring the following advantages to the HD system: 1. Reduce the operator's focusing operation on the lens and prolong the service life of the motor. 2, because the picture is always clear, the camera can have higher efficiency and higher compression ratio when encoding, reducing the resource consumption of transmission and storage; 3, shortening the target capture time, so that the monitoring personnel can be in unit time Browse more screens to improve the effectiveness of the monitoring system.
With the popularity of high-definition cameras, more and more systems require the access of high-definition lenses. All major lens manufacturers have introduced high-definition products with different focal lengths, giving users more choices. With the application of ED lenses, auto focus and other functions in high-definition lenses, the difference between high-definition motorized zoom lenses and standard-definition products is getting smaller and smaller. The future trend will be the integration of products, HD products will gradually replace the existing standard definition products, and become the mainstream of the market.
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