Histogram 2d

# [DocSampleImports]
import os
import sys, getopt
import PyIPSDK
import PyIPSDK.IPSDKIPLGlobalMeasure as glbmsr
# [DocSampleImports]

# [DocSampleDefineArguments]
# define input image path
imagesSamplePath = PyIPSDK.getIPSDKDirectory(PyIPSDK.eInternalDirectory.eID_Images)
inputImgPath = os.path.join(imagesSamplePath,  "Lena_RGB_510x509_UInt8.tif")

# define output data path
outputDataPath = PyIPSDK.getIPSDKDefaultDirectory(PyIPSDK.eDefaultExternalDirectory.eDED_Tmp)
histoCvsPath = os.path.join(outputDataPath,  "histogram.csv")
# [DocSampleDefineArguments]

# [DocSampleLoadImage]
# opening of input image
inImg = PyIPSDK.loadTiffImageFile(inputImgPath)
# [DocSampleLoadImage]

# [DocSampleApplyOp]
# definition of histogram measure parameters
binMin = 0
binMax = 255
binWidth = 2
histogramMsrParams = PyIPSDK.createHistoMsrParamsWithBinWidth(binMin, binMax, binWidth)

# computation of histogram for each color planes
planIndexedHisto = glbmsr.multiSlice_histogramMsr2d(inImg, histogramMsrParams)

# retrieve 'by plane' histograms (used for plot, see below)
redHisto = planIndexedHisto.getValue(0)
greenHisto = planIndexedHisto.getValue(1)
blueHisto = planIndexedHisto.getValue(2)
# [DocSampleApplyOp]

# [DocSampleSaveData]
# save generated histograms
print("Saving histogram data to file " + histoCvsPath)
PyIPSDK.exportToCsv(histoCvsPath, planIndexedHisto)
# [DocSampleSaveData]

try:  
# [DocPlotResults]
    # plot histogram results
    import matplotlib.pyplot as plt
    redPlot, = plt.plot(redHisto.getBinMeanColl(), redHisto.frequencies, 'r+-', label="Red")
    greenPlot, = plt.plot(greenHisto.getBinMeanColl(), greenHisto.frequencies, 'go-', label="Green")
    bluePlot, = plt.plot(blueHisto.getBinMeanColl(), blueHisto.frequencies, 'b^-', label="Blue")
    plt.title("Image histograms")
    plt.xlabel('Bin mean')
    plt.ylabel('Population')
    plt.legend(handles=[redPlot, greenPlot, bluePlot])
    plt.grid(True)
    plt.show()
# [DocPlotResults]
except:
    print("This part of sample requires matplotlib to be executed.")