1, which can be divided into CCD camera and CMOS camera according to chip type.
2. According to the structural characteristics of the sensor, it can be divided into linear camera and area camera.
3. According to the scanning mode, it can be divided into interlaced scanning camera and progressive scanning camera.
4. According to the resolution, it can be divided into ordinary resolution cameras and high resolution cameras.
5. According to the output signal, it can be divided into analog camera and digital camera.
6. According to the output color, it can be divided into monochrome (black and white) cameras and color cameras.
7. According to the output signal speed, it can be divided into ordinary speed cameras and high-speed cameras.
8, according to the response frequency range can be divided into visible light (ordinary) camera, infrared camera, ultraviolet camera, etc.
Second, how to choose an industrial camera
1, select the correct signal type.
The signal types of industrial cameras include analog signals and digital signals. Analog cameras must have an image acquisition card, and the resolution of standard analog cameras is very low, generally 768 * 576; In addition, the frame rate is also fixed, 25 frames per second, and the collected analog signals are converted into digital signals by the digital acquisition card for transmission and storage. Digital cameras collect digital signals, which are not affected by electrical noise. Therefore, the digital camera has a higher dynamic range and can transmit more accurate signals to the computer.
In addition, analog signals may be distorted by electromagnetic interference from other equipment in the factory, such as motors or high-voltage cables. With the increase of noise level, the dynamic range (original signal-to-noise ratio) of analog camera will decrease. The dynamic range determines how much information can be transmitted from the camera to the computer.
2. Choose the appropriate resolution.
Firstly, the accuracy of the target should be determined, and then the resolution should be selected according to the accuracy. However, in order to increase the stability of the system, a pixel unit is not used to correspond to a measurement/observation accuracy value, and usually a multiple of 4 or higher can be selected. In this way, the camera requires a one-way resolution of 1000, and it is enough to choose 1.3 million pixels.
Then look at the output of industrial cameras. If it is attitude observation or machine software analysis and identification, the higher the resolution, the better. If it is VGA output or USB output, it depends on the resolution of the display. No matter how high the resolution of the industrial camera is, the resolution of the display is not enough, which is meaningless. Use the memory card or camera function, and try to choose a camera with high pixels.
Choosing the appropriate resolution depends on the requirements of the system. Generally, the pixel accuracy of the system is equal to the field of view (length or width) divided by the camera resolution (length or width).
3. Choose the right chip.
Industrial cameras are divided into CCD and CMOS. If the object being photographed is moving and the object being processed is moving in real time, then of course a camera with CCD chip is the most suitable. However, CMOS cameras produced by some manufacturers can also be used as CCD if frame exposure is adopted.
Although it is a CMOS chip, it will never be worse than CCD when shooting moving objects. Moreover, if the moving speed of the object is very slow and the moving distance of the object is very small within one or two pixels in terms of pixel size, it is also appropriate to choose a CMOS camera.
In the vision inspection scheme, CCD industrial camera still dominates, but with the reduction of cost and power consumption of CMOS industrial camera, it is also widely used.
4. Choose a powerful manufacturer
The most important thing for industrial cameras is to look at the collected image effect. Good results can be seen even by a completely ignorant person, and good and bad can be distinguished. Conditional customers can actually inspect it, so that they can learn more about industrial cameras and see the real product quality and strength of this company, which is of great help to their choice.
In addition to the function of industrial cameras, we should also consider the specific situation, price and manufacturer of use. Combining external factors and internal conditions, we can choose the most suitable industrial camera.