At present, megapixel lenses are more commonly used fixed-focus, manual zoom, power zoom and so on. For different industry applications, there are basically more mature applications. For example, in the area of ​​traffic capture, a fixed-megapixel camera is commonly used. What is the difference between a megapixel camera and an ordinary camera?
<br> <br> difference definition resolution of the imaging lens in the center of the surface is highest, the edge of the screen is relatively worse. While the normal lens can basically satisfy the definition at the center, the sharpness of the edge will be reduced a lot, and the overall definition can meet the requirement of 440,000 pixels for an ordinary camera.
In fact, there are three key factors that determine the sharpness of the lens: 1. Lens material and purity. The less impurities in the lens, the less interference light it produces, the higher the resolution of the picture; 2. The grinding accuracy 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 accuracy of the lens. Accurate control of the coating process is also one of the determinants of lens definition.
In addition, the use of aspherical lenses for megapixel lenses reduces aberrations, improves the clarity of the lens compared to ordinary lenses, and enables miniaturized designs. Through special optical design techniques, image quality is achieved from the center of the image to the periphery. High-resolution, high-contrast images provide about 2.5 times more resolution than conventional lenses, ensuring high image quality even when the image is cut or enlarged.
Spectral transmission capacity spectral transmission capacity difference <br> <br> lens also helps to improve picture clarity. The transmission of wide frequency light will greatly increase the amount of light received by the camera's target surface. Can enhance the contrast and brightness of the picture, and it is richer in the details of the picture.
Spectral correction capability only difference <br> <br> wide spectrum of transmission capacity for high-definition imaging is not enough, if insufficient spectrum correction capability of the lens, the wavelength of the light part but will not be accurate in the target surface imaging camera, Causes the creation of virtual images. This technique is not possible with ordinary lenses through coating.
How to choose megapixels camera <br> <br> relatively normal lens, megapixels camera with unmatched features and advantages, but we should choose megapixels camera what issues need attention?
Definition corresponds <br> <br> HD camcorder just entering the market, clarity is often around 100 million pixels, megapixels camera users often feel the cost is too high. The HD camera is equipped with a standard-definition lens, the effect can be achieved, and the definition of the SD system has been greatly improved. However, many systems suffer from blurred images, especially the clear center of the screen and ambiguous edges, and debugging can not achieve satisfactory results. With 2 million, 3 million, and 5 million cameras entering the market, users have gradually become aware of megapixel cameras and began to rationally choose the right camera based on the camera.
The megapixel lens is divided from the sharpness. Commonly there are 1.3 million pixel correspondence, 2 million pixel correspondence, 3 million pixel correspondence, and high-end 5 million pixel correspondence products, and some excellent manufacturers have already achieved 10 million pixel correspondence.
Then when selecting a lens, the lens product that is the same or higher than its pixel size must be selected according to the highest resolution of the camera. For example, a 2 million-pixel camera CCD camera commonly used in transportation should be based on the actual application environment to select a 25-mm or 35-mm product that corresponds to 2 million pixels. At present, the resolution of a common electric zoom lens is generally corresponding to 1.3 million pixels, and the demand for telephoto and high-definition lenses is various. For more than 2 million HD cameras, should choose the corresponding high-definition power zoom lens, then 2 million or more corresponding products is the first choice. Of course, higher-definition products should choose higher-pixel lenses, such as 3 million, 5 million corresponding products.
According to consistent application of the camera selection function product <br> <br> some items in the course of a camera with infrared lights required, you should use a lens with IR function, so that at night can also get a brighter picture, At the same time it also reduces the problem of night focus. For more demanding environments, such as with a laser light, monitoring of long-range targets must ensure that non-visible light wavelengths can still achieve transmission rates of more than 60% at 900um.
Lens with automatic focus function to solve the delay problem <br> <br> most HD cameras on the market today are using IP mode output, that is, to complete the coding in the camera. After transmission over the network, the monitoring center needs to be decoded to be displayed on the screen. As we all know, the camera will cause a delay in the encoding process. Similarly, the network transmission will be delayed, and the monitoring center will also create a delay in the decoding process. Therefore, the more devices, the more the number of forwarding times, the delay will be The longer these delays are added together, the more serious the operation of the monitoring staff will be. For fixed-focus products, this part of the delay has relatively little effect. For systems that use a powered zoom lens, this brings us to use. On the one hand, it is a high-definition system. On the one hand, due to the above-mentioned delay superposition, it will cause the picture to always be unclear, or the focusing time is too long to capture the target quickly. In this case, the product with auto focus function must be selected. With the automatic focusing lens, the focusing process is automatically completed at the front end, which makes the image transmitted back to the center always clear, which can bring the following benefits 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, which reduces the resource consumption of transmission and storage; 3, shorten the target capture time, so that the monitoring staff can be in the 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. Major lens manufacturers have introduced high-definition products with different focal lengths, giving users more choices. With the application of ED lenses, autofocus and other functions in high-definition lenses, the difference between HD-powered 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, becoming the mainstream of the market.
<br> <br> difference definition resolution of the imaging lens in the center of the surface is highest, the edge of the screen is relatively worse. While the normal lens can basically satisfy the definition at the center, the sharpness of the edge will be reduced a lot, and the overall definition can meet the requirement of 440,000 pixels for an ordinary camera.
In fact, there are three key factors that determine the sharpness of the lens: 1. Lens material and purity. The less impurities in the lens, the less interference light it produces, the higher the resolution of the picture; 2. The grinding accuracy 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 accuracy of the lens. Accurate control of the coating process is also one of the determinants of lens definition.
In addition, the use of aspherical lenses for megapixel lenses reduces aberrations, improves the clarity of the lens compared to ordinary lenses, and enables miniaturized designs. Through special optical design techniques, image quality is achieved from the center of the image to the periphery. High-resolution, high-contrast images provide about 2.5 times more resolution than conventional lenses, ensuring high image quality even when the image is cut or enlarged.
Spectral transmission capacity spectral transmission capacity difference <br> <br> lens also helps to improve picture clarity. The transmission of wide frequency light will greatly increase the amount of light received by the camera's target surface. Can enhance the contrast and brightness of the picture, and it is richer in the details of the picture.
Spectral correction capability only difference <br> <br> wide spectrum of transmission capacity for high-definition imaging is not enough, if insufficient spectrum correction capability of the lens, the wavelength of the light part but will not be accurate in the target surface imaging camera, Causes the creation of virtual images. This technique is not possible with ordinary lenses through coating.
How to choose megapixels camera <br> <br> relatively normal lens, megapixels camera with unmatched features and advantages, but we should choose megapixels camera what issues need attention?
Definition corresponds <br> <br> HD camcorder just entering the market, clarity is often around 100 million pixels, megapixels camera users often feel the cost is too high. The HD camera is equipped with a standard-definition lens, the effect can be achieved, and the definition of the SD system has been greatly improved. However, many systems suffer from blurred images, especially the clear center of the screen and ambiguous edges, and debugging can not achieve satisfactory results. With 2 million, 3 million, and 5 million cameras entering the market, users have gradually become aware of megapixel cameras and began to rationally choose the right camera based on the camera.
The megapixel lens is divided from the sharpness. Commonly there are 1.3 million pixel correspondence, 2 million pixel correspondence, 3 million pixel correspondence, and high-end 5 million pixel correspondence products, and some excellent manufacturers have already achieved 10 million pixel correspondence.
Then when selecting a lens, the lens product that is the same or higher than its pixel size must be selected according to the highest resolution of the camera. For example, a 2 million-pixel camera CCD camera commonly used in transportation should be based on the actual application environment to select a 25-mm or 35-mm product that corresponds to 2 million pixels. At present, the resolution of a common electric zoom lens is generally corresponding to 1.3 million pixels, and the demand for telephoto and high-definition lenses is various. For more than 2 million HD cameras, should choose the corresponding high-definition power zoom lens, then 2 million or more corresponding products is the first choice. Of course, higher-definition products should choose higher-pixel lenses, such as 3 million, 5 million corresponding products.
According to consistent application of the camera selection function product <br> <br> some items in the course of a camera with infrared lights required, you should use a lens with IR function, so that at night can also get a brighter picture, At the same time it also reduces the problem of night focus. For more demanding environments, such as with a laser light, monitoring of long-range targets must ensure that non-visible light wavelengths can still achieve transmission rates of more than 60% at 900um.
Lens with automatic focus function to solve the delay problem <br> <br> most HD cameras on the market today are using IP mode output, that is, to complete the coding in the camera. After transmission over the network, the monitoring center needs to be decoded to be displayed on the screen. As we all know, the camera will cause a delay in the encoding process. Similarly, the network transmission will be delayed, and the monitoring center will also create a delay in the decoding process. Therefore, the more devices, the more the number of forwarding times, the delay will be The longer these delays are added together, the more serious the operation of the monitoring staff will be. For fixed-focus products, this part of the delay has relatively little effect. For systems that use a powered zoom lens, this brings us to use. On the one hand, it is a high-definition system. On the one hand, due to the above-mentioned delay superposition, it will cause the picture to always be unclear, or the focusing time is too long to capture the target quickly. In this case, the product with auto focus function must be selected. With the automatic focusing lens, the focusing process is automatically completed at the front end, which makes the image transmitted back to the center always clear, which can bring the following benefits 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, which reduces the resource consumption of transmission and storage; 3, shorten the target capture time, so that the monitoring staff can be in the 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. Major lens manufacturers have introduced high-definition products with different focal lengths, giving users more choices. With the application of ED lenses, autofocus and other functions in high-definition lenses, the difference between HD-powered 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, becoming the mainstream of the market.
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