mô phỏng xử lý hình ảnh y học

... phút trên m y P4-2.2Ghz, RAM 512MB. Hình 6. Kết quả mô phỏng ảnh CT bằng chương trình PB1 Hình 7. Kết quả mô phỏng ảnh CT bằng chương trình PB2 Hình 8. Kết quả mô phỏng ảnh MRI bằng ... SỐ BÀI THÍ NGHIỆM MÔ PHỎNG XỬ LÝ HÌNH ẢNH Y HỌC Huỳnh Quang Linh, Võ Như Như Trường Đại học Bách khoa, ĐHQG-HCM (Bài nhận ng y2 6 tháng 01 năm 2006, hoàn chỉnh sửa chữa ng y 04 tháng 09 năm ... mô phỏng bao gồm ảnh X-quang, chụp cắt lớp, ảnh MRI và siêu âm đã được x y dựng nhằm giúp sinh viên hiểu rõ hơn bản chất vật lý, thử nghiệm và phân tích một số vấn đề cơ bản của xử lý ảnh y...

Ngày tải lên: 10/04/2013, 15:44

Ngày tải lên: 09/04/2015, 19:19

Ngày tải lên: 13/08/2013, 14:57

... gives us the ability to modify our perception of visual reality. This ability is typically achieved by inserting a WearComp between the lightspace analyzer and the lightspace synthesizer (Fig. ... Covert prototype of camera and viewfinder having appearance of ordinary bifocal eyeglasses. This is a monocular left-eyed system, with a dummy lens in the right eye having the same physical appearance ... ideal ‘lightspace’ glass User Augmented reality (AR) Figure 3.6 Eyeglasses made from lightspace analysis and lightspace synthesis systems can be used for virtual reality, augmented reality, or mediated reality. Such a glass,...

Ngày tải lên: 17/10/2013, 22:15

... RENDERING The EyeTap glasses of the previous chapter absorb and quantify rays of light, process these rays of light, and then resynthesize corresponding rays of light. Each synthesized ray of light ... trade-off by using different color dyes in each layer that have a specular density as opposed the diffuse density of silver. Wyckoff printed his grayscale pictures on color paper, so the fast (yellow) layer ... moderately, and a fine-grained layer, denoted by a solid line, that responds to a large quantity of light. Ideally, when the more sensitive layer saturates, the next most sensitive layer begins...

Ngày tải lên: 20/10/2013, 17:15

... stay on constantly, but more generally, its output can be varied rapidly and continuously, through the application of a time-varying voltage. 15 The Aremac Similarly, if we apply time-varying ... Antihomomorphic vector spaces. Arbitrarily many (typically 1000 or more) differently exposed images of the same subject matter are captured by a single camera. Typically pictures are signal averaged in ... broad dynamic range by using separate images that differ only in exposure level [59,63,77], and thus to apply the methodology described in Chapter 4 (the Wyckoff principle). THE LIGHTSPACE ANALYSIS...

Ngày tải lên: 24/10/2013, 15:15

... 258 VIDEOORBITS: THE PROJECTIVE GEOMETRY RENAISSANCE and for the pseudoperspective model, φ is given by φ T = [E x (x, y, 1), E y (x, y, 1), (x 2 E x + xyE y ,xyE x + y 2 E y )].(6.33) To see how well the ... force the chirping effect (captured by q x  x 2 and q y  y 2 ) and the converging effect (captured by q x  xy and q y  xy )towork together to match as closely as possible the effect of a projective ... automatically output the 8 parameters of the “exact” model, to properly register the frames. They do not require the tracking or correspondence of explicit features, yet they are computationally easy to...

Ngày tải lên: 24/10/2013, 15:15

... gian Đề cương ôn tập môn “Thiết bị chẩn đoán hình ảnh y học I” 2010 Biên soạn : Sky Chương I –II: Bức xạ và nguyên tử I.Bức xạ: là năng lượng di chuyển trong ko gian hay vật chất. Có 2 loại ... với các e nguyên tử ở các mức NL cao, đ y các nguyên tử n y ra ngoài.  Các e nguyên tử ở mức thấp hơn sẽ nh y lên, lấp lỗ trống của e nguyên tử vừa bị va chạm.  Sự nh y mức NL n y phát xạ ra ... bay ra khỏi nguyên tử, chỉ chuyển từ mức n y sang mức khác.  Sự ion hóa: o Khi NL tác động > NL liên kết ( E>E b ) thì ion bị bắn bay ra khỏi nguyên tử. o Khi bắn phá theo 1 d y chuyền...

Ngày tải lên: 12/12/2013, 14:15

... by (1.3-12) F y ω x y, () Fxy,() i ω x x()–{}exp xd ∞ – ∞ ∫ = F ω x ω y ,() F y ω x y, () i ω y y()–{}exp yd ∞ – ∞ ∫ = Fxy,()f x x()f y y()= F y ω x ω y ,()f x ω x ()f y ω y ()= f x ω x () f y ω y () ... property requires that G 1 xy,()O 1 F 1 xy,()F 2 xy,()…F N xy,(),,,{}= G m xy,()O m F 1 xy,()F 2 xy,()…F N xy,(),,,{}= G M xy,()O M F 1 xy,()F 2 xy,()…F N xy,(),,,{}= … … Gxy,()OFxy,(){}= δ xy,()xdyd ε – ε ∫ ε – ε ∫ 1= ... d x φcos d y φsin+== Fxy,(){}∇ d x 2 d y 2 += d xx 2 Fxy,()∂ x 2 ∂ = d yy 2 Fxy,()∂ y 2 ∂ = Fxy,(){}∇ 2 2 Fxy,()∂ x 2 ∂ 2 Fxy,()∂ y 2 ∂ += F ω x ω y ,() Fxy,() i ω x x ω y y+()–{}exp xdyd ∞ – ∞ ∫ ∞ – ∞ ∫ = ω x ω y i...

Ngày tải lên: 24/12/2013, 09:17

... visual system. Figure 2.4-2a is a I I ω x ω y ,() I I xy,() i– ω x x ω y y+(){}exp xydd ∞ – ∞ ∫ ∞ – ∞ ∫ = I O ω x ω y ,() I O xy,() i ω x x ω y y+()–{}exp xydd ∞ – ∞ ∫ ∞ – ∞ ∫ = I O ω x ω y ,()H ... ω x ω y ,() I I ω x ω y ,()= I O xy,() 1 4π 2 I O ω x ω y ,()i ω x x ω y y+(){}exp ω x d ω y d ∞ – ∞ ∫ ∞ – ∞ ∫ = I O ω x ω y ,() I I ω x ω y ,() H ω x ω y ,()= max min– max min+ EYE PHYSIOLOGY 27 Figure ... is illustrated in I O xy,()K 1 K 2 K 3 I I xy,()+{}log= K i I I xy,() I O xy,() I O xy,() K 1 I I xy,() K 2 I I xy,()+ = K 1 K 2 I O xy,() I I xy,()[] s = 32 PSYCHOPHYSICAL VISION PROPERTIES Because...

Ngày tải lên: 24/12/2013, 09:17

... = T 1 C() t 1 C()YC() t 1 C()YP 1 ()t 2 C()YP 2 ()t 3 C()YP 3 ()++ = T 2 C() t 2 C()YC() t 1 C()YP 1 ()t 2 C()YP 2 ()t 3 C()YP 3 ()++ = T 3 C() t 3 C()YC() t 1 C()YP 1 ()t 2 C()YP 2 ()t 3 C()YP 3 ()++ ... (3.6-6f) U ∗ 13W ∗ uu o –()= V ∗ 13W ∗ vv o –()= W ∗ 25 10 0Y( ) 13⁄ 17–= L ∗ 116 Y Y o   13⁄ 16– 903.3 Y Y o        = Y Y o 0 . 0 0 8 8 5 6> 0.0 Y Y o 0 . 0 0 8 8 5 6≤≤ a ∗ 500 f X X o    f Y Y o    –= b ∗ 200 ... by an additive or a subtractive system. In a subtractive system, the yellow dye acts as a variable absorber of blue light, and with ideal dyes, the yellow dye effectively forms a blue primary...

Ngày tải lên: 24/12/2013, 09:17

... sampling array. F I xy,() Sxy,() δxj∆x– yk y ,() k ∞ –= ∞ ∑ j ∞ –= ∞ ∑ = ∆x y, () F P xy,()F I xy,()Sxy,() F I j ∆xk y, ()δxj∆x– yk y ,() k ∞ –= ∞ ∑ j ∞ –= ∞ ∑ == F I xy,() j ∆xk y, () F P ω x ω y ,() F P ω x ω y ,() ... form Rxy,()2πω 0 K J 1 ω 0 x 2 y 2 +    x 2 y 2 + = J 1 · {} F I xy,() η F I R F I τ x τ y ,()EF I x 1 y 1 ,()F * I x 2 y 2 ,(){}= τ x x 1 x 2 –= τ y y 1 y 2 –= F P xy,()F I xy,()Sxy,()F I xy,() δxj∆x– yk y ,() k ... ω x ω y ,() j k, 0≠ ω xc ω yc ,() ω xc ω xs 2 ≤ω yc ω ys 2 ≤ ∆x π ω xc ≤ y π ω yc ≤ ∆x y R ω x ω y ,() K 0      = ω x ω xL ≤ ω y ω yL ≤ ω xL ω xc >ω yL ω yc > Rxy,() Kω xL ω yL π 2 ...

Ngày tải lên: 24/12/2013, 09:17

... CHARACTERIZATION 5.4. IMAGE PROBABILITY DENSITY MODELS A discrete image array can be completely characterized statistically by its joint probability density, written in matrix form as FIGURE 5.3-3. ... alternatively, as a vector f obtained by column scanning F. Similarly, let the output image array be represented by the matrix P or the column-scanned vector p. For notational simplicity, in the subsequent ... of the image array is given by (5.3-3) where the represent points of the image array. Similarly, the covariance function of the image array is (5.3-4) Case Operations (Multiply and Add) General...

Ngày tải lên: 24/12/2013, 09:17

... Linearity or nonlinearity of the quantization scale can Fjk,() 1.0– Fjk,()1.0<≤ L 2 B = 141 6 IMAGE QUANTIZATION Any analog quantity that is to be processed by a digital computer or digital system must ... and typically have a large dynamic range with fine precision. Integer numbers can be strictly positive or bipolar (negative or positive). The two's complement number system is commonly pg() ... to each sample. If image quality is to be judged by an analytic measure, B is simply taken as the smallest value that satisfies the minimal acceptable image quality measure. For a subjective assessment,...

Ngày tải lên: 24/12/2013, 09:17

... G ˜ xy,() J ˜ xyα; β,,() G ˜ xy,() F ˜ αβ,()J ˜ x α– y β–,()αd βd ∞ – ∞ ∫ ∞ – ∞ ∫ = 2J 1+()2J 1+()ì S G j 1 Sj 2 S,()G xy,()xj 1 S yj 2 S,()= J j i J J xy,;,() * Px y, () Px y, () G j 1 Sj 2 S,()F ,()J j 1 Sj 2 S ... multiplying the impulse response by a window function V(x, y) , which is unity for and and zero elsewhere. By the Fourier convolution theorem, the Fourier spectrum of G(x, y) is equivalently convolved ... unify the presentation, these arrays will be defined in terms of the spatially limited arrays considered previously. First, let the data array be embedded in the upper left corner of a array of...

Ngày tải lên: 24/12/2013, 09:17

... by Hart- ley in 1942 (21). The discrete two-dimensional Hartley transform is defined by the transform pair (8.3-7a) (8.3-7b) where . The structural similarity between the Fourier and Hartley transforms ... is usually based on computational efficiency. In some computing structures, the Hart- ley transform may be more efficiently computed, while in other computing environ- ments, the Fourier transform may ... usually at its geometric center. Similarly, the Fraunhofer diffraction pat- tern of a photographic transparency of transmittance produced by a coher- ent optical system has its zero-frequency term...

Ngày tải lên: 24/12/2013, 09:17

... B. Blackman and J. W. Tukey, The Measurement of Power Spectra, Dover Publica- tions, New York, 1958. 12. J. F. Kaiser, “Digital Filters”, Chapter 7 in Systems Analysis by Digital Computer, F. F. Kuo ... Fourier transform of the window function y( x). If and are known analytically, then, in principle, can be obtained by analytically performing the convolution operation of Eq. 9.4-8c and evaluating the ... nature; an output image array is produced by a weighted linear combination of elements of an input array. The popularity of linear operations stems from the relative simplicity of spatial linear processing...

Ngày tải lên: 24/12/2013, 09:17

Ngày tải lên: 24/12/2013, 09:17

Ngày tải lên: 21/01/2014, 15:20

Ngày tải lên: 21/01/2014, 15:20