Linear-based Eulerian motion modulation
In one embodiment, a method of amplifying temporal variation in at least two images comprises examining pixel values of the at least two images. The temporal variation of the pixel values between the at least two images can be below a particular threshold. The method can further include applying signal processing to the pixel values.
1. A method of amplifying temporal variation in at least two images, the method comprising:
for each particular pixel of the at least two images, detecting a temporal variation of the particular pixel of the at least two images by applying a bandpass filter, the resulting detected temporal variation of the particular pixel between the two images being below a particular threshold;
amplifying the detected temporal variation of each particular pixel; and
providing at least two modulated images by adding the amplified temporal variation to the at least two images by synthesizing the modulated images, for an amplification factor α, according to ƒ(x+(1+α), δ(t)), δ(t) being a displacement function.
2. The method of claim 1 , wherein detecting the temporal variation employs temporal processing.
3. The method of claim 1 , wherein detecting the temporal variation employs spatial processing.
4. The method of claim 3 , wherein the spatial processing removes noise.
5. The method of claim 1 , further comprising visualizing a pattern of flow of blood in a body shown in the at least two images.
6. A system for amplifying temporal variation in at least two images, the system comprising:
a pixel examination module configured to, for each particular pixel of the at least two images, detecting a temporal variation of the particular pixel of the at least two images by applying a bandpass filter, the resulting detected temporal variation between the two images being below a particular threshold; and
a signal processing module configured to:
amplify the detected temporal variation of each particular pixel, and
provide at least two modulated images by adding the amplified temporal variation to the at least two images by synthesizing the modulated images for an amplification factor α, according to ƒ(x+(1+α), δ(t)), δ(t) being a displacement function.
7. The system of claim 6 , wherein the pixel examination module is further configured to detect temporal variation by employing temporal processing.
8. The system of claim 6 , wherein the signal processing is further configured to detect the temporal variation by employing spatial processing.
9. The system of claim 8 , wherein the spatial processing removes noise.
10. The system of claim 6 , further comprising a blood flow visualization module configured to visualize a pattern of flow of blood in a body shown in the at least two images.
11. The method of claim 1 , wherein applying the bandpass filter includes, for each pixel value, analyzing a one-dimensional (1D) image intensity.
12. The method of claim 11 , wherein the 1D image intensity profile is based on a function ƒ(x+δ(t)), where δ(t) is a displacement function.
13. The system of claim 6 , wherein the pixel examination module is further configured to, for each pixel value, analyze a one-dimensional (1D) image intensity profile.