Line Array Cameras Knowledge

Answer 1

A line array camera was a camera that used a line array image sensor. The image sensor was mainly a CCD-based camera. In 2012, a line array LCD image sensor appeared on the market, but the line array CCD-based camera was still the mainstream. The line array image sensor was divided into two types, namely, a color camera and a color camera.

In principle, a line array industrial camera was a special form of a two-dimensional image sensor. When it worked, it would shoot moving objects, convert the captured optical signals into digital signals, store and process them, and finally generate a two-dimensional image. Its working process includes: the optical system uses a lens to image an object on a linear array chip composed of light sensitive elements; during the photo-electric conversion, the picture elements generate different voltage signals according to the brightness, and the complete image is obtained after integration; then the data acquisition card transforms the simulated electric signal into a digital signal and stores it in a computer; finally, the computer processes and analyses the image to obtain the detection and measurement results.

The common parameters of the line array industrial camera are as follows:
1. ** Line frequency **: The camera's shooting speed is usually defined by the number of images taken per second. It is a special frame rate. It is targeted at a few rows of pixels-based CMOS. The camera's shooting speed can reach tens of thousands to hundreds of thousands of images per second. It is usually expressed in Kilosecond.
2. ** Line height **: In actual application, an image is captured after every X line. X line is the line height, which is the "height" of the image.
3. ** Triggering method **: Including line triggering and frame triggering. Line trigger was a line of images taken by the line array camera after receiving the line trigger signal. It was suitable for scenes with uneven motion speed or special imaging techniques. The frame trigger was a frame of images taken after receiving the frame trigger signal (the line height could be customized). It was suitable for shooting objects with relatively uniform motion.
4. ** Perfect line frequency **: Only when matched with the movement speed can a clear image be taken. The ideal line frequency is different for each application.

In terms of sensors, most of them used MOS in the 1970s. At the end of the 1970s, CCDs began to develop rapidly and became mainstream. In the mid-1980s, mos appeared. In the early days, the image acquisition speed of CCDs was lower than that of mos. Before 2010, the price of mos sensors was higher than that of CCDs. After that, major camera manufacturers vigorously developed mos cameras and obtained many practical applications. In the future, mos sensors might become the mainstream of line array cameras. There were differences in image acquisition speed and sensitivity between the two.

The resolution of a line array camera was mostly only reflected in the horizontal direction. For example, a 2048-pixel-long line array camera had 2048 horizontally, and most of the vertical direction was 1 (except for the cameras of the RGH and the PDI). Its important parameters also included resolution (number of resolution), MAX DATA RATE (the maximum amount of data that the camera can take per second), and so on. For example, a camera with 8192*1 and a data rate of 160Mhm would have a line frequency of 160M/8192 = 19000line/second. In addition, the choice of camera would affect the overall cost of the equipment. A large number of cameras required a large lens, a large amount of data required a data cable with a high transmission rate, an image processing card, and high requirements for computing and computers.
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