void convertTo( OutputArray m, int rtype, double alpha=1, double beta=0 ) const;

m     – 目標(biāo)矩陣。如果m在運(yùn)算前沒有合適的尺寸或類型，將被重新分配。rtype – 目標(biāo)矩陣的類型。因?yàn)槟繕?biāo)矩陣的通道數(shù)與源矩陣一樣，所以rtype也可以看做是目標(biāo)矩陣的位深度。如果rtype為負(fù)值，目標(biāo)矩陣和源矩陣將使用同樣的類型。alpha – 尺度變換因子（可選）。beta   – 附加到尺度變換后的值上的偏移量（可選）。

• known conditions

  • source range?and?target range

  • to get source to target scale

  • target type

• then convert

• cv 8u1 to cv 32f1When you use convertTo from CV_8U1 to CV_32F1,
  a pixel value, for example, 255 becomes 255.0.
  But when you try `imshow’ the resulting image,
  the command expects all pixel values to be between 0.0 and 1.0.
  that’s why, without rescaling the image, the image will look all white.
  So this will do the trick as zzz pointed out (thanks).

  input.convertTo(output, CV_32F, 1.0/255.0)

  the difference between?CV_8U&CV_32F&CV_32S?,you can see?

• https://blog.csdn.net/qq_41598072/article/details/90241033

• https://stackoverflow.com/questions/12837876/opencv-convertto-returns-white-image-sometimes

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