Digital Image Processing Tutorial-Mosaic Satellite Image
In
this article further important processes will be explained, which are required during digital image processing.
For Example - After acquiring satellite images based on study area one may need more than one satellite image
to cover study area for analysis. So to cover this study area one may need more than one satellite image and in this case similarity and uniformity for
all satellite images become essential to achieve qualitative and quantitative accuracy
in analysis.
It is also to keep uniform contrast, brightness and enhancement
level for satellite images for better interpretation and analysis. These above process can be performed using image processing software.
Advantages of Mosaic Tool
If any user
have more than one satellite image for his study area than make a single image
from all satellite image is necessary process for similar outcome. Mosaic all
satellite image of study area to make a single satellite image through mosaic
tool available in image processing software.
Using this mosaic tool all
satellite images which are in separate image file can be combined in single image file for
further analysis. Advantage of this process, that all images can be kept in
similar brightness and contrast level as well as balanced enhancement for all
satellite images.
Mosaic Tool
By using tools ‘n’ number of images can be combined together and can
prepare a mosaic image of study area. To use this tool in Erdas Imagine below
steps need to follow-
- Select DataPrep from main tools window of Erdas imagine then a data preparation tool window will open in that go to Mosaic Images and click on it.
- A Mosaic images tool will open, in that select and click on Mosaic tool for further process of Mosaic images.
- A mosaic tool window will open in that tool many options were there in the top such as File, Edit, Process and Help. In the beginning Edit tool will use to add all images which need to mosaic in single file.
- Go to Edit tool and click on Add Images option then file browser will open, with that select all images for mosaicing process.
- After adding all images for mosaic process, these images can be arrange in sequence, such as image which you need to keep up than move it forward or can be send back using icons highlighted in the red box as shown in the below figure after adding image process.
Figure- Mosaic Tool and Mosaic Process Steps
- Then go to Edit tool and select color corrections option through which brightness and contrast can be corrected as well enhancement similarity can be created using this tool.
- To create mosaic, go to Process and click Run Mosaic. The shortcut icon for Run mosaic is also there highlighted in red color box in the last of the process in above image.
- When click on Run mosaic, a browser window will open in that need to define output image, its mean the file which will be created using this mosaic process.
Use of Mosaic tool
In
this mosaic process one can also define pixel size i.e. spatial resolution.
Sometime file size become very big and one may need mosaic only for display
purpose then spatial resolution can be reduced to medium or low to save space
and for faster process. Mosaic and subset are very common process, which are
very frequently used together in image pre-processing. As it facilitate and
speed up the image processing and save precious time of user.
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