XX
XX
XX
XXXXXXX
^
^
The origin of the TTF font character is left bottom, your drawing routine assumes Y=0, which means the font is drawn off the image. Give it a positive Y value, say 40.
Also you need to specify the fullpath to the TTF font. Annotate will not draw the text if the font file does not exist. Do you have Chinese fonts installed on your system? That 'kai.ttf' is a Chinese font which I think might not exist on your computer. ;-)
If you want to display the image with imDisplay, add the following to the end of your script:
system("imDisplay test.png");
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