class_docstr: Mean DC shift analyzer
class_docstr_tok: ["Mean","DC","shift","analyzer"]
code: def process(self, frames, eod=False):
      if frames.size:
          self.values = numpy.append(self.values, numpy.mean(frames))
      return frames, eod
  
file_path: TimeSide/timeside/plugins/analyzer/dc.py
imports: from timeside.core import implements, interfacedoc
  from timeside.core.analyzer import Analyzer
  from timeside.core.api import IValueAnalyzer
  import numpy
label_desc: Use image node_id 6 for calling the MeanDCShift obj's underlying member method code with example usage: obj.process(frames, eod) and returns: frames,  eod