Page 1 of 1

about camera module

Posted: Wed Sep 11, 2013 7:29 am
by takenoha
Hi,

I have taken the following at the camera module of raspberry pi
$ raspistill-o image.jpg

I think it's basic commands.
However, an image that is visible between the display for 5 seconds, an image actually shot are different.
For example, an object that is to be displayed in full screen during the 5 seconds, looking at the image that was actually shot, I feel the object is displayed in a small size in the image.

Should this happen? Failure?
I'm having problems when not know have been examined causes
# I think it also be due because you change the focal length

Is there a way to fix this? Or Is there such as a command to capture an image that is displayed for five seconds?

Thanks
takenoha

Re: about camera module

Posted: Wed Sep 11, 2013 8:11 am
by JoeDaStudd
The standard command displays preview window for 5 seconds.
I believe this is so you can line up the camera before it takes the shot.
You can remove the preview window by using the parameter -n.

Do you mean capture the 5 seconds of video, take the photo then display it for 5 seconds or something else?

EDIT: Here's a link to the documentation pdf.

Re: about camera module

Posted: Wed Sep 11, 2013 8:21 am
by jamesh
takenoha wrote:Hi,

I have taken the following at the camera module of raspberry pi
$ raspistill-o image.jpg

I think it's basic commands.
However, an image that is visible between the display for 5 seconds, an image actually shot are different.
For example, an object that is to be displayed in full screen during the 5 seconds, looking at the image that was actually shot, I feel the object is displayed in a small size in the image.

Should this happen? Failure?
I'm having problems when not know have been examined causes
# I think it also be due because you change the focal length

Is there a way to fix this? Or Is there such as a command to capture an image that is displayed for five seconds?

Thanks
takenoha
The preview code uses a video mode so that it can run at 30fps, when the capture is made, the mode used is a high resolution one, which uses a larger part of the sensor.

This is on my list of bugs to fix (ie new video mode that works at full frame)

Re: about camera module

Posted: Wed Sep 11, 2013 12:21 pm
by takenoha
Thanks for reply
Sorry, I did not write English well

I want to take a photo, not video.
I hit the command as follows:
$raspistill -o image.jpg

After hit command, preview is displayed on the display ( for 5 seconds ).
After 5 seconds, photo is taken and saved.
But, one image displayed in the preview image and the stored is different.
The stored image represents the wider range than an image displayed by a preview.
I do not know why this happens.
I want to save a displayed photo in the preview.

help me.
takenoha

Re: about camera module

Posted: Wed Sep 11, 2013 12:55 pm
by RaTTuS
what jamesh fixes the preview code this will happen
as it is now
the preview is a smaller image than the actual image

Re: about camera module

Posted: Wed Sep 11, 2013 1:49 pm
by jamesh
Try the --fp option, which reduces the frame rate of the preview but does use the full field of view.

Re: about camera module

Posted: Wed Sep 11, 2013 4:11 pm
by takenoha
I tried --fp option, but I did not took a photo which displayed in the preview (no --fp option).
I want to take a photo which displayed in the preview.

Why preview window is smaller than actually taken photo?
I trouble to adjust the distance between the object and the camera.
If I can take same photo (preview and actually), it is easy to adjust distance.

To take the same image as the look of the preview, what would I should do?
Sorry for my poor English sentence, but please advice for my trouble.
takenoha

Re: about camera module

Posted: Wed Sep 11, 2013 4:44 pm
by jamesh
takenoha wrote:I tried --fp option, but I did not took a photo which displayed in the preview (no --fp option).
I want to take a photo which displayed in the preview.

Why preview window is smaller than actually taken photo?
I trouble to adjust the distance between the object and the camera.
If I can take same photo (preview and actually), it is easy to adjust distance.

To take the same image as the look of the preview, what would I should do?
Sorry for my poor English sentence, but please advice for my trouble.
takenoha
See my post above. The preview uses a different camera mode that uses a smaller part of the sensor. I need to develop a new mode that works at 30fps but uses the whole sensor - I haven't had time to do that.

What is the problem with -fp? That should do what you want, but at a lower preview frame rate.

Re: about camera module

Posted: Thu Sep 12, 2013 2:35 am
by takenoha
Does not mean there is a problem with the --fp.
It is only different --fp and what I want to do

That, when I want to adjust the distance of a object and camera to take a photo in the entire picture size, do I need to check the saved photos?
Is it impossible to adjust while watching the preview?

If so, I accept that it is a kind of settings.