PIV Standard Image

Objective

The PIV Standard Images are provided for the evaluation of PIV techniques.
Please refer the 3D-STD page for images of three-dimensional data.
The PIV technique is roughly classified into two steps, i.e., Visualization and Image Processing. The Image Processing includes image enhancement, particle detection, particle tracking, image cross correlation, velocity averaging and erroneous evaluation. To evaluate the Image Processing technique for PIV, The following standard images are generated.
The original velocity distribution for STD image (#01-#08) can be downloaded using FTP or HTTP
The data file contains [x,y,u,v,w].

References

Okamoto, K., Nishio, S., Saga, T. and Kobayashi, T., 2000, "Standard images for particle-image velocimetry," Meas. Sci. Technol., 11, 685-691.
Okamoto, K., Nishio, S., Kobayashi, T., Saga, T., Takehara, K., 2000, "Evaluation of the 3D-PIV Standard Images (PIV-STD Project)," J. Visualization, 3-2, 115-124.
Okamoto, K., Nishio, S., Saga, T. and Kobayashi, T., 1997, "Standard Images for Particle Imaging Velocimetry," Proc. PIV-Fukui'97.

Standard Images

No.	Title	Animation	download
01	2D Wall shear flow/Reference	JAVA/GIF	Download
02	2D Wall shear flow/Large displacement	JAVA/GIF	Download
03	2D Wall shear flow/Small displacement	JAVA/GIF	Download
04	2D Wall shear flow/Dense Particle	JAVA/GIF	Download
05	2D Wall shear flow/Sparse Particle	JAVA/GIF	Download
06	2D Wall shear flow/Constant particle size	JAVA/GIF	Download
07	2D Wall shear flow/Large particle size	JAVA/GIF	Download
08	2D Wall shear flow/Large out-of-plane velocity	JAVA/GIF	Download
21	3D jet impingement/Reference	JAVA/GIF	Download
22	3D jet impingement/Large out-of-plane velocity	JAVA/GIF	Download
23	3D jet impingement/Dense Particle	JAVA/GIF	Download
24	3D jet impingement/Sparce Particle	JAVA/GIF	Download
41	2D jet flow	JAVA/GIF	Download

Custom-made Standard Images
Users can select the image parameters. The program automatically generate the standard images with the selected parameters. The velocity data are based on the No.01.

Parameters

Image size [W x H (pixel)]
Particle Displacement [v (pixel/interval)]
Non-dimensional Out-of-plane Velocity [w = w'/T (-/interval)]
Out-of-plane velocity (w')[cm/interval] is divided by the laser light thickness (T)[cm].
Ratio of Out/In-plane velocity [r (-)]
Ratio of Out-of-plane velocity (w) to In-plane velocity (u,v)
Image Vorticity [O (/interval)]
O = (dv/dx - du/dy) * dt
The vorticity is multiplied by the image interval. This parameter shows the image distortion.
Number of Particle [N (n/image)]
Particle Diameter [D (pixel)]
Average [X_m]
Standard Deviation [X_s]
Maximum [X_x]

Data List of the Standard Images

No.	W x H	v_m	v_s	v_x	w_m	w_s	r_m	o_x	N	D_m	D_s	Movie	Download
01	256x256	7.5	3.0	15.0	0.017	0.012	0.12	1.4	4000	5.0	1.4	JAVA/GIF	01
02	256x256	22.0	9.0	45.0	0.06	0.04	0.12	14.0	4000	5.0	1.4	JAVA/GIF	02
03	256x256	2.5	1.0	5.1	0.006	0.004	0.12	0.47	4000	5.0	1.4	JAVA/GIF	03
04	256x256	7.4	3.0	15.0	0.017	0.012	0.12	1.4	10000	5.0	1.4	JAVA/GIF	04
05	256x256	7.4	3.0	15.0	0.017	0.012	0.12	1.4	1000	5.0	1.4	JAVA/GIF	05
06	256x256	7.5	3.0	15.0	0.017	0.012	0.12	1.4	4000	5.0	0.0	JAVA/GIF	06
07	256x256	7.5	3.0	15.0	0.017	0.012	0.12	1.4	4000	10.0	4.0	JAVA/GIF	07
08	256x256	7.5	3.0	15.0	0.17	0.12	0.12	1.4	4000	5.0	1.4	JAVA/GIF	08
21	256x256	4.2	2.4	9.5	0.04	0.04	0.18	1.1	4000	7.0	2.0	JAVA/GIF	21
22	256x256	4.2	2.4	9.5	0.15	0.15	0.18	1.1	4000	7.0	2.0	JAVA/GIF	22
23	256x256	4.2	2.4	9.5	0.04	0.04	0.18	1.1	12000	7.0	2.0	JAVA/GIF	23
24	256x256	4.2	2.4	9.5	0.04	0.04	0.18	1.1	1000	7.0	2.0	JAVA/GIF	24
41	256x256	4.1	2.1	7.1	0.006	0.004	0.13	1.3	3000	6.0	2.0	JAVA/GIF	41

okamoto@tokai.t.u-tokyo.ac.jp