Android Question picture (dot) detection like face detection

[Sia]

Hi,
how can detect a little dot on page like A3 Paper ?
i want make picture from a paper and i want when camera see or detect this 4 dot warn me camera ready to make picture ( like face detection )
please see this picture

 

[Erel]

You will need to take the preview image and search for this dot.

You can use Bitmap.GetPixel to get the color of each pixel.

A more efficient process would be to go over the raw bytes. However you will need to first understand the format (YUV if I remember correctly).

 

[Sia]

Hi,
thanks Erel , can you give me more information or link about it ?
did you means i have to make picture in every second and process it ?

 

[Erel]

Check the CCTV example. It handles the preview images.