我可能还没有完全理解直方图......但我想我可以得到一个二维的灰度图像,对吧?
一维很好:
from cv import *
import os, glob, sys
original = LoadImage('test.jpg')
gray = CreateImage(GetSize(original), IPL_DEPTH_8U, 1)
canny = CreateImage(GetSize(original), IPL_DEPTH_8U, 1)
NamedWindow('Circles', 1)
CvtColor(original, gray, CV_BGR2GRAY)
bins = 30
scale = 10
hist = CreateHist([bins], CV_HIST_ARRAY, [[0,256]], 1)
CalcHist([gray], hist)
hist_img = CreateImage([bins*scale,50], 8, 1)
Rectangle(hist_img, (0,0), (bins*scale,50), CV_RGB(255,255,255), -1)
(_, max_value, _, _) = GetMinMaxHistValue(hist)
for i in range(0,bins):
bin_val = QueryHistValue_1D(hist, i)
#print bin_val
norm = Round((bin_val/max_value)*50)
Rectangle(hist_img, (i*scale, 50), (i*scale+scale-1,50-norm), CV_RGB(0, 0, 0), CV_FILLED)
ShowImage('Circles', hist_img)
WaitKey(0)
但是当我打电话给 CalcHist 时,第二个说他需要两个平面或图像:
from cv import *
import os, glob, sys
original = LoadImage('test.jpg')
gray = CreateImage(GetSize(original), IPL_DEPTH_8U, 1)
NamedWindow('Circles', 1)
CvtColor(original, gray, CV_BGR2GRAY)
bins = 30
scale = 3
hist = CreateHist([bins,bins], CV_HIST_ARRAY, [[0,255], [0,255]], 1)
CalcHist([gray], hist)
hist_img = CreateImage([bins*scale,bins*scale], 8, 1)
#Rectangle(hist_img, (0,0), (bins*scale,50), CV_RGB(255,255,255), -1)
Zero(hist_img)
(_, max_value, _, _) = GetMinMaxHistValue(hist)
for h in range(0,bins):
for s in range(0,bins):
bin_val = QueryHistValue_2D(hist, h, s)
inte = Round(bin_val*255/max_value)
Rectangle(hist_img, (h*scale, s*scale), ((h+1)*scale-1,(s+1)*scale-1), CV_RGB(inte, inte, inte), CV_FILLED)
ShowImage('Circles', hist_img)
WaitKey(0)
这个错误:
OpenCV Error: Bad argument (Unknown array type) in cvarrToMat, file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_graphics_opencv/work/OpenCV-2.2.0/modules/core/src/matrix.cpp, line 641
Traceback (most recent call last):
File "hist2d.py", line 16, in <module>
CalcHist([gray], hist, 0)
cv.error: Unknown array type
如果我使用:
CalcHist([gray, gray], hist, 0)
它有效,但我得到了一个搞砸的直方图(对角线彩色,其余的是黑色)
所以...有人可以启发我吗?