space width ratio 中文意思是什麼
space width ratio
解釋
空寬比-
In the plate region of a vehicle image, the gray value varies frequently in cross - direction, so we define a parameter ". cross variance " to describe it. we also calculate other parameters to approximately locate the plate, they are the space length between two chars, the thickness of stroke, the peak and trough of gray value, the ratio of width and length, etc. at last, we exactly locate the plate by the theory of mathematical morphology
該方法根據圖像車牌區域橫向灰度值變化頻率比較大這一特徵提出了橫向方差參數,並結合車牌的字元間距、筆劃粗細、灰度峰谷值、長寬比值等特徵粗定位車牌,在車牌的精確定位中利用了數學形態學的方法。我們從某高速公路收費站實地拍攝的照片中選取了1000多幅作為實驗樣本數據。 -
After introduce the main technologies of ac regulation speed, the paper deduces in details the voltage space vector pulse width modulation ( svpwm ) technology and svpwm ' s vector selection of constant ratio of voltage and frequency
本文在介紹了交流調速系統的種種主流技術后,較為詳細地討論了電壓空間矢量脈寬調制( svpwm )技術,並對恆壓頻比且為同步調制時的svpwm矢量的選擇,進行了細致地推導。
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