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Adds 16 bits support to histogram calculation

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Modifies code to accept any encoding depth.
Updates tests to fit with code modifications.
Adds example in order to present a strange case with different encoding
depth and actual pixel values.
Adds an image that fits with the example

Reported-by: Julien Lengrand-Lambert
Signed-off-by: Julien Lengrand-Lambert <julien@lengrandlambert.fr>
This commit is contained in:
Julien Lengrand-Lambert
2011-12-29 12:08:03 +01:00
parent 19dfe78503
commit cce1449a9a
4 changed files with 21 additions and 49 deletions
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21
examples/histogram_display.py
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@@ -21,18 +21,23 @@ import cv
import tippy.statistics as st
import tippy.display_operations as do
<<<<<<< HEAD
# test with 8 bits color image
img_name = "tippy/data/tippy.jpg"
img = cv.LoadImage(img_name, cv.CV_LOAD_IMAGE_COLOR)
hist = st.Histogram(img)
imgs = hist.to_images() # list of Red, Green, Blue channels
do.display_single_image(imgs[2], "Blue channel histogram of the tippy image")
=======
img_name = "tippy/data/gnu.jpg"
img = cv.LoadImage(img_name, cv.CV_LOAD_IMAGE_COLOR)
hist = st.Histogram(img)
hist_img = hist.hist2image()
do.display_single_image(hist_img[0], "Gray-Level histogram of the gnu image")
# test 16 bits histogram, with 4096 range
# special tortuous case :
# 12 bits encoded image
# Taken as 16 bits image, only histogram range to be changed.
img_name = "tippy/data/peaks.tif"
img = cv.LoadImage(img_name, cv.CV_LOAD_IMAGE_UNCHANGED)
img_depth = 12
hist = st.Histogram(img, img_depth)
tables = hist.to_tables() # list of values. Only one item in list
print max(tables[0]) # search for the max value of histogram