Issue61

[nutsjian]

What is the purpose of the change

1. get the base64 image size and modify the container size.
2. set the size of the obtained base64 image to the model.

Related issues/PRs

Related issues: #61

Brief change log

Checklist

• I have read the Contributing Guidelines on pull requests.
• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible
• If this is a code change: I have written unit tests to fully verify the new behavior.

[dlimeng]

LGTM