**Introduction :**

The study of histograms learning depicts the histogram, which is one of the
graphical representations of data. Understanding the pictures of histograms helps extensively for recognition and retrieval of visual database from the given data table or grouped data. Histogram
is a kind of picture, which represents similarity of the bar graph. Thus the understanding of histograms are made easier for through explanation given below.

**There are 4 types of histograms:**

1. histogram (absolute counts)

2. Relative histogram (converts counts to proportions)

3. Cumulative histogram

4. Cumulative relative histogram.

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Study understanding the construction of a histogram:

For better understanding of histograms, rectangles or blocks are drawn on the x-axis without
any spaces between them whose areas are proportional to the classes they represent are understood. Histograms are used normally where the subject item is discrete (discontinuous) instead of being
continuous (such as the variations in their heights).The study of histograms are said to be a frequency diagram which , a histograms are generally preferred over a histograph where the number of
classes is less than eight.

**Study the camera Histograms**:

The study of camera histogram shows all the image’s in which overall exposure is done in it. The vertical bars in the image are
here to represent the brightness levels in the range of 0 to 255.The 0 indicates the leftmost bar and the 255 indicates the rightmost bar. The altitude of the bar indicates the number of the
pixels on the brightest levels. The exciting thing in the image is how the bar spreads from left hand side to the right hand side. If the image has no black pixels then the histogram has no bars
on the left side.Thus understandings of histograms are quite easier.

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Study Example for Histograms understanding:

** ** The histogram that explains quantity of children’s who visits the zoo.