How to remove objects in diferent pics if they have diferent pdi

1 次查看（过去 30 天）
Gytis Raudonius
Gytis Raudonius 2015-10-18
回答： Walter Roberson 2015-10-19
So question is if i fave recantgle and i want to remove objects who area is lower than 0,45 cm2 and biger 5,5 cm2. I know that i can do with UL and UB but it doesnt work if have diferent pics with diferent pdi

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2015-10-19
Presuming that pdi is ppi, pixels per inch, then 1/ppi is inches per pixel, and 2.54/ppi is cm per pixel. From there, (2.54/ppi)^2 is cm^2 per pixel^2, which is 6.4516/ppi^2 with units cm^2 per pixel^2.
Then, 0.45 cm^2 / (6.4516 cm^2 / ppi^2) = 0.069750139500279 * ppi^2 gives the number of square pixels for 0.45 cm^2. For example for 75 ppi then it would be about 392.3 square pixels, which is between 19x19 and 20x20

类别

在 Help Center 和 File Exchange 中查找有关 MATLAB 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by