What's wrong with the chip and/or sketch?

Question

Arduino

Following the example from this article, I decided to make a scanner. Collected, everything works, but the processing program gives this:

that_same_that

In the processing sketch, I changed the COM8 port to my own.
In the Arduino sketch, I uncommented this:

/*byte x = DriverRead(0x02);
  byte y = DriverRead(0x03);
  if(x || y)
  {
    Serial.print("X:");
    Serial.print(x,DEC);
    Serial.print(" Y:");
    Serial.println(y,DEC);
  }*/

.
Without this section of code, it gives

this is unclear

The chip used first the one that was in the post, then ADNS-3060, and then PAW3502. Yuzal without a lens.
With a lens, the picture is a little more diverse:

spoiler

Board: Arduino Uno r3

Answer 1

in general, it looks quite realistic, maybe everything works fine, but is it just the surface texture that looks like this?