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- It includes topics such as spatial frequency filtering, holography. 它包括空間頻率濾光、全息攝影。
- Spike Frequency Adaptation and Negative Feedback Linearization. 峰頻率適應性與負回饋的線(xiàn)性化。
- Luminance masking and spatial frequency masking were considered in our scheme. 此方法考慮了人的視覺(jué)所具有的亮度屏蔽和空間頻率屏蔽特性。
- The results revealed mild lowering contrast sensitivity at high spatial frequency for our glaucoma patients. 然而特定軸度之閃光眩耀測試結果并未見(jiàn)明顯差別。
- The Collins formula and tensor ABCD law in spatial frequency domain provide the relation between the input spatial Fourier spectrum and the output spectrum directly. 空間頻率域中的柯林斯公式和張量ABCD定律直接給出了像散光束的空間傅里葉頻譜的傳輸規律。
- Analyzed is the dependence of the defocusing quantity on the hologram size and the spatial frequency bandwidth of the object. 分析了全息圖尺寸及其記錄的空間頻帶寬度與離焦量的關(guān)系;
- The diffraction of surface acoustic waves in Raman-Nath regime on acoustic grating with linearly chirped spatial frequency is investigated. 本文將聲表面波聲柵上的Raman-Nath衍射現象研究發(fā)展到其周期的空間頻率為線(xiàn)性變化的聲柵情形。
- The effects of radial position and the axial length of the electrode on the temporal frequency bandwidth are similar to the spatial frequency domain. 在時(shí)間頻域內測量系統相當于帶通濾波器,電極的軸向長(cháng)度和顆粒徑向位置對頻帶寬度的影響與空域頻率特性相似;
- Method Modulation transfer function (MTF) was used to analyze the spatial frequency transfer characteristics of CT and MRI. 調制傳輸函數可對線(xiàn)性影像系統的頻率傳輸特性進(jìn)行描述。
- A new spatial frequency analysis method based on wavelet was applied to homomorphic filtering to enhance the contrast of ICT image. 針對ICT圖像對比度低、邊緣模糊、細節不清晰等問(wèn)題,提出采用基于小波的同態(tài)濾波算法來(lái)對圖像進(jìn)行增強。
- A method of super-resolution imaging is described, which utilizes cosine fringes to acquire more spatial frequency spectrum of the object. 研究了一種高分辨率成像的方法，該方法利用余弦條紋照射目標以獲取目標更寬的頻譜。
- Nyquist frequency defined as the highest spatial frequency where the sensor can still faithfully record image detail. Beyond the Nyquist frequency aliasing occurs. 奈奎斯特頻率的定義是：感光器能夠忠實(shí)紀錄影像細節的最高空間頻率。在此頻率以上就會(huì )發(fā)生混肴現象。
- A more accurate way to look at the sensitivity of an imaging system is to evaluate the Detective Quantum Efficiency (DQE) as a function of spatial frequency. 研究成像系統靈敏度的一個(gè)更精確的辦法是精確一個(gè)考慮成像系統是將量子檢測效率(DQE)當作空間頻率的函數來(lái)計算。
- Methods The fractures of the ribs of 512 patients were suspected in clinic, and those CR images were processed with gradation and spatial frequency technology. 方法對臨床懷疑肋骨骨折512例患者的肋骨CR影像應用諧調處理與空間頻率處理的方法進(jìn)行技術(shù)處理。
- This paper studies intensively the "bilinear interpolation and 2D-IFFT" method of reconstructing image from the unevenly spaced data in the spatial frequency domain. 本文深入研究了由空間頻域上的非均勻采樣數據重建圖象的“雙線(xiàn)性插值加二維快速傅里葉反變換”方法。
- Methods based on spatial frequencies evaluate the coefficients of the autocorrelation function of the texture. 基于空間頻率的方法估計紋理的自相關(guān)函數。
- Using a method of the spatial frequency filtering by combining the directional filtering with the very low frequency filtering, the desirable optical signals cau be taken out of a considerably complex image. 采用方向性濾波與極低頻濾波相結合的方法;可以從較復雜的圖象中提取所需用的信號.
- Visual evoked potentials (VEP) to square-wave gratings (spatial frequency 1.4 c/deg. , flickering frequency 2.9 Hz, contrast 0.94) at various stimulus locations on the retina were recorded from human occipital scalp. 以人視覺(jué)誘發(fā)電位(VEP)反應為指標;在視野的不同位置測定了VEP對四個(gè)方位的閃爍方波光柵刺激(時(shí)間頻率2.;9Hz;空間頻率1
- The Collins formula in spatial frequency domain is generalized into axially nonsymmetrical optical system in terms of tensor analysis method. Based on this formula, the tensor ABCD law in spatial frequency domain is derived. 運用張量分析方法把軸對稱(chēng)系統中的空間頻率域的柯林斯公式推廣到一般的非軸對稱(chēng)光學(xué)系統 ,并推導了在空間頻率域中適用于非軸對稱(chēng)光學(xué)系統的張量ABCD定律。
- In order to simply obtain the phase of a surface in phase measuring profilometry (PMP), a fully automatic phase unwrapping method based on projected double spatial frequency fringes has been deduced. 為了在相位輪廓測量術(shù)中更簡(jiǎn)便可靠地獲取待測面的相位場(chǎng)，提出了一種利用雙頻投影條紋的疊柵特性進(jìn)行全自動(dòng)相位解包裹的方法。
