SingleChannelHistogram

Compute histogram of single channel image.

Subscribing Topic

• ~input (sensor_msgs/Image)

  Input image. It should has CV_8UC1 as encoding.

• ~input/mask (sensor_msgs/Image)

  Mask image. if ~use_mask is true, histogram is computed with this mask image.

Publishing Topic

• ~output (jsk_recognition_msgs/ColorHistogram)

  Histogram of ~input image.

Parameters

• ~use_mask (Boolean, default: false)

  If this parameter is set true, histogram is computed with mask image.

• ~hist_size (Integer, default: 10)

  The number of bins of histogram.

  This parameter can be changed by dynamic_reconfigure.

• ~min_value (Double, default: 0.0)

• ~max_value(Double, default: 256.0)

  Minimum and maximum value of histogram.

  These parameters can be changed by dynamic_reconfigure.

Sample

roslaunch jsk_perception sample_single_channel_histogram.launch