analog video image 中文意思是什麼
analog video image
解釋
模擬視頻影像-
In this system, the movement of the step - electromotor is controlled by computer, and then the dial pointer is drove by the step - electromotor. at the same time, these images of the analog instrument are took by high precision ccd video, and then these images will be processed by the computer, using some image - processing algorithms such as image segmentations, threshold identification, image binarization, areas labeling, dial center - point identification, useful areas identification & abstracting, and areas thinning, etc. followed this, the dial pointer of the “ circle ” is able to be located. at last, the dial pointer position will be recognized by the computer
本系統由計算機控制步進電動機的運動，進而驅動指針式儀表表針的運動，並且通過高精度ccd攝像機實時獲取表盤圖像數據，同時進行表盤圖像的相關處理，包括圖像分割，閾值確定，圖像二值化，區域標記演算法，圓心擬合，有效區域識別提取，區域細化等，最終快速識別出表盤指針所處位置;最後，根據國家指針式儀表類檢定規程所制定的演算法計算出該儀表的相關誤差，檢定指針式儀表的各種精度，通過這些數據判斷該儀表是否合格，列印該儀表的檢定結果報表。 -
According to the characteristic of ieee 1394 with wide bandwidth, common and real - time, the author put forward ieee 13 94 should be applied into real - time digital video transfer in optics - electronics theodolite. before engineering realization, carried out a video image transfer test on three types of digital video tape recorders and camera with ieee 1394 interface. we found that digital videos without compression transfered under ieee 1394 standard ( transfer from 4. 5m to 100m ), compared with analog videos, have no geometric distortion, and have better luminance, contrast, definition
作為工程實現前的實驗研究，對三類具有ieee1394介面的數字錄像機和攝像機進行了視頻圖像傳輸實驗，發現無壓縮格式的按ieee1394標準傳輸的數字視頻圖像（傳輸距離從4 . 5米到100米之間） ，較原始模擬視頻圖像在幾何位置信息上沒有衰變，而在亮度、對比度、邊緣清晰度這些方面有明顯的優勢；但是按dvcam壓縮格式（常見于sony公司的系列產品，是5 ： 1的dct幀內壓縮）壓縮的數字視頻圖像，較原始模擬參照圖像有明顯的幾何畸變。 -
The method is as follows : when the video signals from cmos image sensor pass through a high - pass analog filter, the microprocessor samples and processes them and then judge whether the lens is in focus. if the lens is not well focused, the microprocessor will control the lens to be in focus by moving the stepping motor
這一系統採用的方法是通過對cmos圖像傳感器輸出的模擬視頻信號進行濾波，提取出代表圖像清晰程度的高頻成分，選用單片機組成硬體電路，對信號進行處理並分析判別聚焦位置、控制馬達轉動鏡頭至對焦清楚。 -
The main contents of the paper are : i the relationship of the accurateness of calculation, complexity of calculation and hardware resources of the 5 - 3 dwt ; ii the basic theory of pci data transmission the controlling of the host to client and the data exchanging ; iii configuration of the video decoder saa7114h to implement the transformation of the analog to the digital image ; iv image acquisition, compression and transmission from the host to the acquisition board by the component of field programmable gate array ( fpga ), digital signal processor ( dsp ) with the controller of pci and video decoder saa7114h
Pci的數據傳輸原理，外部主機如何控制從屬設備以及如何進行數據交換。配置視頻解碼器saa7114h ，實現模擬ccd攝像頭模擬數據到數字數據的轉換，實現採集的功能。用fpga 、 saa7114h和集成pci介面的dsp實現圖像的採集、壓縮以及從採集板到主機的傳輸。 -
The outputs of the camera are analog video signals, and the pixel points of the image sensor are difficult to synchronize with the acquisition card. therefore the images have low quality, and the resolution is limited
由於攝像機的輸出已轉換成模擬視頻信號方式，且攝像頭傳感器的象素點在輸出時序上很難與採集卡的采樣點一一對應，因此視頻圖像數字化后圖像質量損失較大，圖像分辨力受到限制。
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