Difference between revisions of "Visualizing Images: Displaying images using the animate view"

Latest revision as of 14:15, 21 February 2012

If you select the animate view, the software makes a copy of the image dataset and loads it into an image window showing the animate view. In animate view, like cine view, the software automatically advances through the entire image dataset. However, the animate view allows you to adjust the speed at which images are advanced. You can specify that images be displayed in forward or reverse order. You can also pause or stop the sequence.

To view an image dataset in animate view
1 Select Image > Views > Animate in the MIPAV window. The Animate Parameters dialog box (Figure 1) appears.
2 Type the scale factor that you want to use in the Scale factor box.

3 Select one of the three interpolation methods.
4 Click OK.
MIPAV transforms the dataset using the scale factor and interpolation method you indicated. A progress message (Figure 2) appears while the program constructs the animated file. It then loads a copy of the dataset in the Animate window.

Figure 3. Image window shown in the Animate view

File	Save Image as .avi-Saves the dataset as an AVI, or digital video, file.
	Close Animate-Closes the Animate window.
Options	Show Z Slice Numbers-Displays, if selected, the slice number, or the frame number, on the lower left side of the image.
Continuous reverse	Steps through all of the images in the dataset continuously in reverse without stopping at the speed specified in Desired frames per second.
Reverse	Steps through all of the images in the dataset once in reverse at the speed specified in Desired frames per second.
Forward	Steps through all of the images in the dataset once in sequence at the speed specified in Desired frames per second.
Continuous forward	Steps through all of the images in the dataset continuously without stopping at the speed specified in Desired Frames per second.
Backward and forward	Steps through all of the images in the dataset in sequence and then in reverse continuously without stopping at the speed specified in Desired Frames per second.
Pause	Pauses the animation at the frame currently shown.
Stop	Halts the animation and redisplays the first image in the dataset.
Magnify image 2.0X	Magnifies the image by 2.
Magnify image 0.5x	Magnifies the image by one-half.
Set brightness/contrast	Specifies the brightness and contrast of the image. When you select this icon, the Brightness/Contrast dialog box opens. To change the brightness, slide the Brightness slider to the level desired and then click Apply. To change the contrast, slide the Contrast slider to the level desired and click Apply.
Delete current slice	Removes the slice currently shown in this window from the image dataset. Caution: The program does not allow you to undo slice deletion. Before you delete slices, you may want to have a backup of the complete image dataset to avoid losing images.
Frame number	Sets the first image slice shown to the frame, or slice, number that you specify. Notice that the frame number appears in the box to the right of the slider.
Desired frames per second	Specifies how many frames, or slices, should appear in 1 second. The read-only box to the right shows the actual number of frames per second your computer has achieved. The number of frames per second depends on the amount of memory accessible by the computer and CPU time.

Adjusting dataset display

You can magnify or reduce the display of your dataset using the magnification icons. Use , the Magnify image 2.0x icon, to enlarge the image to twice its current size.

Adjusting the brightness and contrast in images

To adjust the brightness and contrast in the image, do the following:
1 Click , the Brightness/Contrast icon, in the Animate window. The Brightness/Contrast dialog box (Figure 4) opens.
< 2 Move the Brightness slider to the position you want. Notice that the level of brightness changes on the image as you move the slider.
< 3 Move the Contrast slider to the desired contrast level. The contrast in the image changes as you move the slider.
< 4 Click Apply when you are finished. The image in the Animate window reflects the changes in brightness and contrast that you made.
5 Click , the close button at the top right of the dialog box, to close the dialog box.

Removing slices from image datasets

In the Animate window, you can also remove slices from the dataset. First, you need to find the slice that you want to delete. To find a slice number, do either of the following:
Select Options > Show Z Slice Numbers, which shows the slice number at the lower left of the image (refer to Figure 3).
Move the Frame Number slider to the slice that you want to delete. The number appears in the box on the right of the slider.

Once you locate the slice that you want to remove, click , the Delete icon. The slice is removed from the dataset.

Caution: The program does not allow you to undo slice deletion. Before you delete slices, you may want to have a backup of the complete image dataset to avoid losing images.

Playing a dataset "film"

Using the icons and buttons on the toolbar in the Animate window (Figure 3), you can produce and play a dataset "film." To do so, complete the following steps:
1 Move the Frame number slider to the slice that you want to see first.
2 Move the Desired frames per second slider to indicate the speed at which images should be advanced or reversed.
3 Click the following buttons as appropriate:
Click , the Forward icon, to advance the image dataset forward through all of the images one time (one loop).
Click , the Reverse icon, to advance the image dataset backward through all of the images one time (one loop).
Click , the Continuous Forward icon, to advance the image dataset forward through all of the images multiple times. To stop image advancement, you must press , the Pause icon, or , the Stop icon.
Click , the Continuous Reverse icon, to advance the image dataset backward through all of the images multiple times. You must press the press , the Pause icon, or , the Stop icon, to stop image reversal.
Click , the Pause icon, to pause the image advancement or reversal.
Click , the Stop icon, to stop the image advancement or reversal.<br /

Note: As the images advance or reverse, you may notice that the desired frames per second and the actual frames per second differ. Although you can type any number in the desired frames per second, the actual speed at which the images advance depends primarily on your computer's processor speed.
</font> 4 Save the animate viewer file by selecting File > Save Image as .avi (AVI, or audio video interleaved, is a Microsoft multimedia format). The Choose Type of AVI File dialog box (Figure 6) opens.
5 Select a type of file.
6 Click OK. The program runs the animation sequence that you created, closes this dialog box, and then displays the Save dialog box.

7 Specify a name for the animation sequence in the File Name box.
8 Click OK. The dialog box closes and the Choose File Type dialog box (Figure 7) opens.

9 Select a file type.
10 Click OK. The Save Range of Slices dialog box (Figure 8) opens.
11 Close the Animate window by either selecting File > Close Animate or pressing Ctrl X. The Animate window closes.

Visualizing Images: Displaying images using the cine (movie) view