线数分别（Line number, respectively）.docVIP

线数分别（Line number, respectively） 1, the resolution is an important parameter to measure the quality of the camera, which is when the camera arrangement interval of black and white stripes, on the monitor to see the human maximum line number, when more than the line number on the screen, you can only see and cant distinguish the black and white lines on a gray. The resolution is divided into horizontal resolution and vertical resolution. 2, test method, camera shooting comprehensive test chart, visual method to observe the monitor on the image center wedge can distinguish the maximum number of lines or ten groups of central clear line segment can distinguish the maximum number of lines. 3, the test should pay attention to (1) use good imaging lenses, because the lens is good or bad, affecting the final test results. (2) a black-and-white monitor display, the number of lines should be in 600 above the line, if you use a color monitor, the color saturation knob to the minimum, to avoid the interference of luminance chrominance signal. 4, the procurement should pay attention to (1) the use of SONY, Matsushita original camera to do horizontal comparison, observation of two kinds of camera resolution gap in the black and white lines group; performance index of original machine is reliable, by contrast, the clarity index to purchase the camera to draw the correct conclusion. (2) the purchase of SBC, sometimes lens imaging quality is poor matching, in addition to the test center resolution, or test four angular resolution, not blur and distortion, otherwise, it is necessary to replace the good shot. Two, minimum illumination index should have relevant conditions 1, the concept of minimum illumination, the brightness output level of the camera is the minimum illuminance of the object when it is half of the rated level (700mV). 2, test methods Ten level gray card (1) contrast method: put the camera in the dark room, choose a name factorys original camera Contrast, use the same