CCD machine vision dimensional measurement is based on relative measurement methods, determining the actual dimensions of an object through traceable calibration, magnification factor calibration, automatic edge extraction, and image computation on the screen.
To achieve micrometer-level precision, the system's magnification must exceed 35x, resulting in a single field of view width of less than 5 mm. For workpieces larger than 5 mm, full-size inspection requires combining displacement readings with multi-window image stitching.
In intelligent and automated industrial environments where product manufacturing demands increasingly higher accuracy and precision, machine vision offers an exceptionally efficient inspection solution. The following sections will clearly analyze the principles and application value of CCD machine vision technology from three dimensions.

1. What functions does the CCD machine vision have:
1-1. Positioning function: It can automatically identify the position features on the appearance of the inspected product. During the inspection process, if these appearance features do not match the image coordinates provided in the database, it can be determined that the product is defective or flawed.
1-2. Measurement function: It can automatically measure the appearance dimensions of the product. Using a CCD camera to take multi-angle shots of the inspected product, it can measure basic values such as length, width, and height of the product. It can also increase the number of CCD cameras and adjust the angles to improve the measurement accuracy to 0.001mm, and measure the dimensions of various shaped objects. By performing database calculations, it compares the corresponding dimensions with the inherent data in the database to determine whether the product dimensions are qualified.
1-3. Recognition function: It can automatically recognize the color, graphics, and characters of the product. Through database calculations, it determines whether the characters, colors, and graphics appearing on the inspected product are correct, thereby determining whether the inspected product is qualified.
1-4. Inspection function: It can automatically detect whether certain features are present on the product. Through database calculations for feature judgment, if the features of the inspected product include or exceed the original features and new features, it can determine whether the inspected product is qualified.

2. Application Process of CCD Machine Vision Inspection System:
2-1. Firstly, if the detected object approaches or moves to the center of the industrial camera's field of view, a trigger pulse signal will be sent to the image acquisition device.
2-2. The image acquisition device will start sending the pulse to the industrial camera and the lighting equipment according to the preset program and delay set by the designer. However, some industrial cameras and lighting devices start to operate directly when the system is powered on.
2-3. The industrial camera stops the current scan and then restarts the new frame scan; sometimes the industrial camera needs to be in a waiting state before the pulse arrives, while the frame scan starts after the pulse arrives.
2-4. If the strategy used is the exposure strategy, the exposure control system should be turned on before the industrial camera starts the new frame scan, and the exposure time, exposure speed, and exposure intensity should be set by the program or hardware according to your actual needs.
2-5. If the exposure strategy is adopted, use another start pulse to turn on the lighting equipment, especially the start time should match the exposure time, exposure speed, and exposure intensity of the industrial camera.
2-6. After the industrial camera exposes, the scanning and output of one frame image officially begins.
2-7. If the output of the industrial camera is an analog signal, the image acquisition device will perform an A/D conversion on the signal received from the industrial camera to digitize it. If the output is a digital signal, the captured digital signal of the image will be saved; otherwise, the image captured by the image acquisition device will be saved.
2-8. The image acquisition device sends the image signal to the data buffer, and then it is processed and displayed by the processor or computer memory.
2-9. The processor or computer processes, analyzes, and recognizes the image to obtain measurement results or logical control variables, and then processes them according to these results to control other devices (such as mechanical equipment, etc.) to complete related actions and perform positioning. Correct motion errors, reject defective products, for example, correct the positioning and grasping of the robotic arm or sort out defective products.

3. Advantages of CCD machine vision detection in industrial product inspection:
3-1. The CCD machine vision inspection equipment is a non-contact measurement method, which can avoid damaging the object being measured. It is suitable for situations where it is difficult to access the object being measured due to high temperatures, high pressure, fluids, environmental hazards, etc. It can replace manual operations and ensure production efficiency and safe production.
3-2. The size measurement technology of CCD machine vision has good continuity and high precision, greatly improving the real-time and accuracy of industrial online measurement, and also significantly enhancing production efficiency and quality control.
3-3. The CCD machine vision inspection equipment can greatly reduce the inspection cost of industrial product enterprises in terms of efficiency. It can complete the detection of different items on the original multi-person pipeline inspection by using one device. The original 5-6-person inspection line is reduced to 1-2 people, reducing the employment cost of the enterprise.

Quality inspection of industrial products after production is an important step before their circulation. Machine vision has its unique technical advantages in industrial product inspection, which can reduce labor costs and bring considerable benefits to enterprises. Therefore, with the development of CCD technology, its application will become increasingly widespread.