如何定义采样二进制图像的像素密度 [英] How to define Pixel Density of a sampled binary image

问题描述

这可能是一个非常简单的问题，但我与此有冲突。我将特定的二进制图像（28 x 28）分成（4 x 4）个样本。现在我想计算每个样本的像素密度（我将这些密度值用作OCR应用程序中的特征）。据我所知，密度定义了特定区域中的像素数，例如每平方英寸7个像素。在这里是一样的吗？我的所有样本都有4个像素。 Moment-> m00与像素密度之间是否存在关系？有人能解释一下吗？ plz help

解决方案

我想说你的所有样本都有4 x 4 = 16像素。如果原始图像是二进制图像，则该样本的密度仅为4乘4平方的1个像素的数量。或者您可能希望将该数字除以16以将结果标准化为区间[0,1]。



图像的M00时刻定义为总和其像素的灰度值。因此，对于每个4乘4平方，像素数等于图像那部分的M00。



希望有所帮助。

hi, this may be a very simple matter, but i have conflict with that. I have split a particular binary image(28 x 28) into (4 x 4) samples. Now i want to calculate the pixel densities of each sample(i use those density values as features in a OCR application). As i know density defines the number of pixels in a particular area, like 7 pixels per square inch. Is that the same in here? all of my samples have 4 pixels. Is there are relationship between Moment->m00 and pixel density ? can someone explain this ? plz help

解决方案

I would say that all of your samples have 4 x 4 = 16 pixels. If the original image is a binary image, the density of that sample is simply the number of 1 pixels in that 4 by 4 square. Or you might want to divide that number by 16 to normalize the result to the interval [0,1].

The moment M00 of an image is by definition the sum of the gray values of its pixels. For each 4 by 4 square the number of pixels is hence equal to M00 of that part of your image.

Hope that helps.

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