Question

A square QR code contains 40×40 tiny squares (pixels) where each tiny square represents a 0 or a 1. Calculate how many bytes of data can be stored on the QR code​

Answer 1

The number of bytes that can be stored on the QR code is 200 bytes.

Step-by-step explanation:

To calculate the number of bytes that can be stored on the QR code, we need to determine the total number of pixels. The QR code contains 40x40 tiny squares, which means there are a total of 40x40 = 1600 pixels.

Each pixel represents a 0 or a 1, which means each pixel can store 1 bit of data. To convert the number of pixels to bytes, we divide the total number of pixels by 8, since 1 byte is equivalent to 8 bits.

Therefore, the number of bytes of data that can be stored on the QR code is 1600 / 8 = 200 bytes.

Answer 2

Step-by-step explanation:

QR Codes are made of multiple rows and columns. The combination of these rows and columns makes a grid of modules (squares). There can be a maximum of 177 rows and 177 columns which means the maximum possible number of modules is 31,329. With the eye, these are just small squares and mean very little, but the exact arrangement of those modules allows the QR Code to encode its data. This means that, unlike traditional barcodes which are 1 dimensional and use 1 row of lines, QR Codes use 2 dimensions which allows them to store a lot more data in the same area of space.