Resolution is the precision of the screen image, which refers to the number of pixels that the display can display. Because the dots, lines and surfaces on the screen are all composed of pixels, the more pixels the display can display, the more fine the picture will be. Similarly, in the concept of industrial cameras, the resolution is expressed by the number of pixels. In the same field of view, the higher the resolution, the more information displayed, the higher the recognition accuracy, the more detailed the image can be seen, so the resolution is one of the most important performance indicators.
So, is it true that the higher the resolution of the camera, the better the image will be? Let's look at the following picture first.
From the picture, we can see that in the same display area, the image taken by the high resolution camera is much better in terms of overall clarity and image details. Therefore, from this point of view, we do not consider other factors, the size of resolution and image effect is directly proportional.
So what other factors will be included?
In fact, the relationship between the pixel and the photosensitive unit of the image sensor (CCD or CMOS) is not a simple one-to-one correspondence. Image sensors with the same number of pixels have different area sizes. The larger the area, the larger the size of a single pixel, the more light intensity information they can accept, the lower the probability of high light bit overflow and noise generation. Usually, the closer the generated photos are to reality, and the better the image quality will be. Conversely, the smaller the size of the image sensor, the smaller the size of each pixel, the fewer the optical signals it can sense, the fewer the number of photoelectrons and the larger the fluctuation. It is necessary to amplify the signal in the process of photoelectric signal conversion. When the signal and noise are amplified together, it is easy to produce image noise, which affects the image quality. Moreover, the small size of sensor and the large number of pixels will cause the spacing between pixels to be too close, which will also cause the increase of image noise.
From this point of view, it is not advisable to blindly pursue high pixels and ignore the size of the image sensor, and the advantages may even outweigh the disadvantages.
1. High pixels do not necessarily bring high picture quality, and too high pixels have a negative effect on the improvement of image resolution, sensitivity, noise control ability, etc.
2. The size of the camera's photosensitive elements basically determines the grade of the camera. For example, the area of the high-end DC must be larger than that of the low-end DC.
3. Regardless of CMOS or CCD, the larger the area of a single pixel, the larger the heat dissipation space and the stronger the noise control ability. At the same time, the smaller the influence of diffraction spot on the pixel, the better the imaging effect.
4. Whether a high pixel can bring high quality depends on whether the area of a single pixel still has enough high definition under the commonly used minimum aperture value. Under the condition of ensuring the image clarity, the higher the pixel, the richer the details of the photo, the more distinct the layers, and the higher the quality of the picture.
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