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

[Soonhac Hong]

Hi Josh,

The compile error was the follows.

error: no matching function for call to 
'sensor_msgs::CvBridge::imgMsgToCv(sensor_msgs::Image&, const char [12])'


Best,
Soonhac


On 11/19/2010 01:18 PM, Josh Faust 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 
> <mailto: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
>
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