[ros-users] Convert sensor_msgs/Image to the opencv image

[Josh Faust]

Ah, but it looks like fromImage is deprecated.  Does anyone know why there's
no longer a way of turning a non-shared pointer of a sensor_msgs/Image into
a cv image?

In the meantime you could use a null deleter and create a shared_ptr out of
the image:

void nullDeleter(void*) {}
boost::shared_ptr<sensor_msgs::Image> image_ptr(&srv.response.left_image,
nullDeleter);

Josh

On Fri, Nov 19, 2010 at 1:18 PM, Josh Faust <jfaust at willowgarage.com> wrote:

> What was the compile error you got originally?  That's not a valid cast to
> be making.
>
> There's a version of fromImage that just takes the sensor_msgs/Image -- are
> you sure that srv.response.left_image is a sensor_msgs/Image?
>
> Josh
>
> On Fri, Nov 19, 2010 at 12:49 PM, Soonhac Hong <soonhac.hong at gmail.com>wrote:
>
>> Hi all,
>>
>> I'm trying to convert sensor_msgs/Image to the opencv image. The
>> sensor_msgs/Image is defined in the ros service as follows.
>>
>> <temp_srv.srv>
>> bool isColor
>> ----
>> sensor_msgs/Image left_image
>>
>>
>> The problem has happened at the following code.
>>
>> IplImage* left_image = bridge_.imgMsgToCv((const
>> sensor_msgs::ImageConstPtr&) srv.response.left_image, "passthrough");
>>
>> Without the casting,(const sensor_msgs::ImageConstPtr&), there was an
>> compile error. With the casting, there is a runtime error, segmentation
>> fault. Is there anyone to know how to get the
>> sensor_msgs::ImageConstPtr& of the sensor_msgs/Image which is defined in
>> the ros service?
>>
>> I confirmed that there are the proper value of each pixel in the
>> srv.response.left_image.data[] as well as srv.response.left_image.width
>> and srv.response.left_image.hight.
>>
>> Thank you for any comments.
>>
>> Best,
>> Soonhac
>>
>> _______________________________________________
>> ros-users mailing list
>> ros-users at code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ros.org/pipermail/ros-users/attachments/20101119/2b5e0abb/attachment-0003.html>