How to control the intelligent system of CCD industrial camera

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There are several main types of CCDs:

1. Area scan CCD industrial camera:

Allows the photographer to shoot a moving object at any shutter speed.

2. Line scan CCD industrial camera:

Scan with a row of pixels, do it three times – corresponding to the red, green, and blue filters, and as the name suggests, the linear sensor captures a one-dimensional image. In the early days, it was used in the advertising industry to shoot still images, line arrays, and high-resolution images, which were limited to non-moving, continuously lit objects.

3. Three-wire sensor CCD industrial camera:

In a three-line sensor, three parallel rows of pixels are overlaid with an RGB filter, and when capturing color, the complete color is made up of multiple rows of pixels. Three-wire CCD sensors are mostly used in high-end digital cameras to produce high resolution and spectral color levels.

4. Interleaved transmission CCD industrial camera:

This sensor utilizes a separate array to capture the image and convert the battery, allowing the current image to be read while the next image is taken. Interleaved transmission CCDs are commonly used in low-end digital cameras, camcorders, and broadcast cameras that shoot movies.

5. Full-frame CCD industrial camera:

This CCD has more power handling, better dynamic range, low noise and transmission optical resolution, and the full-frame CCD allows for instant full-color shooting**. If you want to know more about REGEM MARR, you can call 4000-697-797 anytime and anywhere**, you can get product introduction, purchase consultation, after-sales processing and other manual services, any questions you feedback, will be answered professionally and considerately.

CCD cameras have many advantages, from the appearance of Huaiqi, it is small and lightweight; From the perspective of energy consumption, it is a low-power device; In terms of performance, it is easy to output and has a low degree of external interference.

CCD cameras have high sensitivity. The cell optical quantum yield of the CCD is very high, reaching 20% when the light is illuminated from the front: when the light is irradiated from the back and using the thinning CCD, the yield can reach 90%.

CCD cameras have high-precision photosensitive geometric positions and high spatial resolution.

CCD cameras have a wide range of spectral responses. Normally, the effective operating wavelength range of a CCD camera is between 400nm-1100nm, with 800nm being about its maximum response. In the UV-irradiated region, the silicon wafer itself is also absorbed, resulting in a reduction in quantum efficiency.

If the light is irradiated from the back and a thinning CCD is used, 100 nm is the limit value of the operating wavelength.

CCD cameras have a wide range of dynamic responses. Typically, the effective dynamic response of the CCD is in the range of 4-8 orders of magnitude.

CCD cameras are anti-allergenic**. The CCD does not damage the chip due to the light intensity, it only saturates the photosensitors.

CCD cameras can not only resist strong light, but also carry out signal acquisition work under low-light conditions, and realize photoelectric conversion and signal output.

CCD cameras monitor fast-moving objects by simply selecting a small integration time.

Since the CCD camera is easy to connect with other devices, it can form a multi-functional automated inspection system.

The main difference between the quality of CCD cameras is that they are characterized by low noise, high sensitivity, high quantum efficiency, good linearity, large dynamic range, uniformity of response and high spatial resolution, and some of these characteristics, such as sensitivity, linearity and dynamic range, are directly related to the scanning speed of the camera (i.e., readout speed).

Camera selection, pixel and accuracy.

As mentioned earlier, pixels refer to the number of CCDs on an image sensor, and the image sensor is generally a 4:3 rectangle, so the camera pixels are divided into landscape and portrait (x and y directions). In general, the more pixels you have, the more detail you can see per unit area, and these details determine the accuracy of the system.

For example, there is now a field of view of 100mm*100mm and accuracy requirements. The number of CCDs in each direction of the image sensor is at least 100 = 1000. In order to cooperate with subsequent image processing such as edge extraction, 3 times the number of pixels is generally required, ie.

Number of CCDs in X direction = 3 x Field of view (X direction) Accuracy (X direction) = 3000

Number of CCDs in the Y direction = 3x Field of View (Y direction) Accuracy (Y direction) = 3000

You can choose a camera with 3000*3000 pixels or more.

Handling of some special scenes:

case1 If you calculate that the pixels in the x and y directions are very different, for example.

Number of CCDs in X direction = 3 x Field of view (X direction) Accuracy (X direction) = 3000

Number of CCDs in Y direction = 3x Field of view (Y direction) Accuracy (Y direction) = 1000

a : 4160 *3120 or b: 1280*980 ?

In this case, you should choose A, and it is better to choose a camera with more pixels than a camera with a smaller calculation result.

case2 If the pixel requirement is too large, for example.

Number of CCDs in X direction = 3 x Field of view (X direction) Accuracy (X direction) = 30000

Number of CCDs in Y direction = 3x Field of View (Y direction) Accuracy (Y direction) = 30000

At this point, it can be difficult to find a camera that meets your requirements. The corresponding method is to use multiple cameras, divide the field of view into multiple pieces, and each camera is responsible for capturing a piece of field of view, thus reducing the requirements for each camera pixel.

Depending on what object you are shooting, whether it is stationary or moving, whether you need autofocus, how big the object is, and how far away you are shooting, are all factors in the choice. I'm doing this, and questions are welcome.

Contact Shenzhen Vision Dragon, directly put your product requirements forward or send samples, they will help you select and **.

Must have a CCD image sensor.

There must be a driver, which is to convert the timing signal of the TTL LVTTL into the high and low voltage drive signal required for the CCD.

It is necessary to have a timing generator, a special timing chip, or an embedded processor, and write ** by yourself.

It is necessary to have the various power supplies required for the CCD.

The analog signal of the CCD output also needs to have an ADC to convert the analog signal into a digital signal.

processor, do the necessary image processing.

Transmission interface, output images or image processing results to other devices. Or it is the transmission of communication control commands.

These are must-haves and are the basis of all industrial cameras.

CCDs with lattice pixels are used in the image sensors of digital cameras, optical scanners, and camcorders. Its light efficiency can reach 70% (it can capture 70% of the incident light), which is better than 2% of traditional soft films, so CCDs are quickly gaining mass adoption by astronomers.

Linear CCD used by fax machines

After the image is imaged on the surface of the capacitance array through a lens, a charge of varying strength is formed on each capacitance unit according to its brightness. Linear CCDs used for fax machines or scanners capture a thin strip of light and shadow at a time, while planar CCDs used by digital cameras or camcorders capture an entire image at a time, or a square area from it. Once the action is completed, the control circuit will transfer the charge on the capacitive cell to the next adjacent cell, and when it reaches the last cell at the edge, the electrical signal is passed to the amplifier and converted into potential.

This is repeated until the entire image is converted to potential, sampled, digitized, and stored in memory. Stored images can be transferred to a printer, storage device, or display. In the early 1990s, frozen CCDs were also widely used in astrophotography and night vision devices, and major observatories continued to develop high-resolution CCDs to photograph very high-resolution objects**.

CCDs have a wonderful application in astronomy, allowing fixed telescopes to function like tracking telescopes. By making the direction of the charge reading and moving on the CCD be consistent with the direction of the celestial body, and the speed is also synchronized, the CCD guide star can not only effectively correct the tracking error, but also enable the telescope to record a larger field of view than the original.

Most CCDs can sense infrared rays, so they can derive infrared images, night vision devices, zero-illumination (or near-zero-illumination) cameras, etc. In order to reduce infrared interference, astronomical CCDs are often cooled with liquid nitrogen or semiconductors, because objects at room temperature will have the effect of infrared blackbody radiation. The sensitivity of the CCD to infrared rays has another effect, and it is easy for various digital cameras or video recorders equipped with CCDs to capture the infrared rays emitted by the remote control without an infrared filter.

Lowering the temperature reduces the dark current across the capacitor array, increasing the sensitivity of the CCD to low illumination, and even to UV and visible light (higher signal-to-noise ratio).