[canopus961]

Hi.

I'm developing a Python camera application, and I'm using the viewfinder technique seen before in other post, basically:

while running:
    canvas.blit(camera.take_photo(size=(160, 120), zoom=0, exposure='auto'))

This works well, but there is one bad point: speed.

The refreshing rate is very slow, about 1-2 images per second.

I'm testing it with both fast and slow version of python 1.1.6 in a Nokia 7610 phone.

Perhaps it's possible to make a direct method (in a pure c library) that can refresh quickly the camera image to a canvas object?

It could be great to let it works out of a while loop, working background in a lock.wait().

I have heared about Miso library, but I dont know if that one is faster doing this.

Any idea?

Thanks.

[jplauril]

Prototype code for the viewfinder exists but I'm not making any promises on when it'll be released.

[moisesmariscal]

Why the camera is so slow with Python?
I use: camera.take_photo(mode='RGB12', size = (160,120)) and it takes about one second to take the picture. The camera preview of the phone (Nokia 3230) is very smooth and takes and shows a lot more of frames in that interval.
Exists any way to increase speed? My phone only offers RGB12 and (160,120) as the smallest way to make it faster.

[eriksmartt]

Originally Posted by canopus961

Perhaps it's possible to make a direct method (in a pure c library) that can refresh quickly the camera image to a canvas object?

Yup. The problem, AFAIK, is in the time it takes to bring the image data in and push it to the screen. otsov has something magic in the works that brings the image blitting process closer to the hardware (ie., much, much faster... and more like how the native Camera application does it.)

Otsov -- is any of that code hidden in the 1.3.1 source release or somewhere online?

[otsov]

Originally Posted by eriksmartt

Otsov -- is any of that code hidden in the 1.3.1 source release or somewhere online?

Unfortunately not. The key method is "CCamera::StartViewFinderDirectL()" if somebody would like to try the usage of direct screen access.

[invi]

Hi,

i am developping an application that reads a barcode, evaluates its string and connects to a database for further processing. However I do know that this is not a completely new thing, I still came up with some problems processing the image.

I am trying to use the StartViewFinderDirectL() function provided by CCamera (C API), wrapped up for use in Python.

Is there any prototype-code on how to bring up the captured frames to the screen (aka the viewfinder ) ?.

I also tried to use StartViewFinderBitmapsL() that returns its frames in ViewFinderFrameReady() but didnt come up with the correct coding to bring up the frames on the display.

Any help would be muchly appreciated

thanks,
invi

[otsov]

Originally Posted by invi

Is there any prototype-code on how to bring up the captured frames to the screen (aka the viewfinder ) ?.

Have a look at this demo application:

http://www.forum.nokia.com/info/sw.n..._0_en.zip.html

[invi]

Originally Posted by otsov

Have a look at this demo application:

http://www.forum.nokia.com/info/sw.n..._0_en.zip.html

great, thanks. VRexViewFinder.cpp/h looks really good at a first glance.

I'll try this out as soon as I'm with my N93