我当前的Python代码(如下)将一个图像切片成n切片,并按每行/列的顺序返回每个切片的坐标。在
与其从xMin/yMin 1/1开始,一次只完成一行,我希望从图像的中间开始,螺旋式地展开,最终完成所有的切片。如何做到这一点?在
import math
slices = 11
imageWidth = 1024
imageHeight = 576
totalPixels = imageWidth * imageHeight
print 'Slices: ' + str(slices)
# Re-calculate slices
slices = int(slices/2)*2
print 'Re-calculated slices: ' + str(slices)
print 'Total pixels in image: ' + str(totalPixels)
print 'Maximum slices allowed: ' + str(totalPixels/4)
factor = math.sqrt( slices )
print 'Factor: ' + str(factor)
if (slices > totalPixels/4):
print 'You cannot use more than ' + int(totalPixels/4) + ' slices!'
else:
regionWidth = int(math.ceil(imageWidth / factor))
regionHeight = int(math.ceil(imageHeight / factor))
print 'Region size: ' + str(int(regionWidth)) + 'x' + str(int(regionHeight))
print 'Region width: ' + str(regionWidth)
print 'Region height: ' + str(regionHeight)
imageWidthRounded = int( math.ceil(factor) * math.ceil( imageWidth / factor ) )
restWidth = imageWidthRounded - imageWidth
imageHeightRounded = int( math.ceil(factor) * math.ceil( imageHeight / factor ) )
restHeight = imageHeightRounded - imageHeight
print 'Rest width: ' + str(restWidth)
print 'Rest height: ' + str(restHeight)
factorRounded = int(math.ceil(factor))
print 'Factor rounded: ' + str(factorRounded)
xMin = 0
xMax = 0
yMin = 0
yMax = 0
rows = factorRounded
columns = factorRounded
print 'Total rows: ' + str(rows)
print 'Total columns: ' + str(columns)
for column in range(1, columns+1):
xMin = 0
xMax = 0
if column == columns:
print 'Col '+ str(column) + ' (last column) '
yMin = (column*regionHeight + 1) - regionHeight
yMax += (regionHeight - restHeight)
else:
print 'Col '+ str(column)
yMin = (column*regionHeight + 1) - regionHeight
yMax += regionHeight
for row in range(1, rows+1):
if row == rows:
xMin = (row*regionWidth + 1) - regionWidth
xMax += (regionWidth-restWidth)
print 'Row ' + str(row) + ': xMin=' +str(xMin) + '\t xMax=' + str(xMax) + '\t yMin=' + str(yMin) + '\t yMax=' + str(yMax) + ' (last row)'
else:
xMin = (row*regionWidth + 1) - regionWidth
xMax += regionWidth
print 'Row ' + str(row) + ': xMin=' +str(xMin) + '\t xMax=' + str(xMax) + '\t yMin=' + str(yMin) + '\t yMax=' + str(yMax)
首先,尝试列举一些案例:
案例1:
返回中心值。在
案例2:
^{pr2}$从左上角按顺时针顺序返回值。在
案例3:
^{3}$返回中心,然后从左上角按顺时针顺序返回值。在
。。。在
一般来说,如果网格的维数是奇数,我们需要首先返回中心值。在这之后,我们可以跟踪当前切片的边界角点,并迭代地将这些角点扩展到下一级以处理所有切片。我们可以通过网格的维数来确定切片的总数(从而确定迭代次数)。在
以下是实现为generator的函数:
输出示例:
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