Hi,

I have added M12 lens mounts to two of my cameras, and had two NoIR cameras that came with M12 mount and lens.

Now I used a normal v1 camera (NoIR) and just placed it a bit above the page, rotated by 90° to have the bigger camera width (2592 > 1944) cover the page height:

As I said before I took the photo with "raspistill -o test.jpg".

Then I rotated the image with netpbm tools:

Code: Select all

`$ jpegtopnm test.jpg | pnmflip -rotate90 | pnmtojpeg > bof.p9.jpg`

This was the result:

Then I used tesseract as before, but only few words got correctly decoded.

Next I processed the image with gimp's Threshold Color tool (117):

Here the tesseract output is much better:

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```
pi@raspberrypi3Bplus:~ $ cat bof.p9.txt
i
—2.4 -20 —I.O —I2 -03 Ago—on
Fig.2. 7719 Mandelbrot setfor them rux3+c mm
with the window —2.4 < Rec< 08. -l.2<lmc<12 Thom
among the various types 0/ boundaries at Mum! values alt}! .
Mandelbrot's process Is mathematically equivalent to thaw.
X... i =/(x )a-x‘. +c
is the simple foqula GIven a number m take its squareandaddm
to get X); then repeat to get x; X}. and so on. Everyone can “mm
one expected to find so much enigmatic beauty hidden In this W "‘1?"-
Let us begin with the simplest possible Choice of the constant 6. VIII 9-“
Then we just square the number at each Iteration: on-oJﬁI-uﬁbl‘» . .
There are three possibilities for the sequence. depending on m: "l ’
i , T he numbers become smaller and smaller their sequence approach.
zeio We say that zero is an attractor for the process XI-oxz. All palatal“
than a distance of i from this attractor are drawn into it.
2. The, numbers become larger and larger tending towards inﬁnity. We any
that infinity Is also an attractor for this process All points farther than a dish I
tance of 1 from zero are drawn into it.
3. The points are at a distance of 1 from zero and stay there. Their sequence
lies on the boundary between the two domains of attraction, in this case the
unit circle around zero.
The situation is clear Two zones of inﬂuence divide up the plane, and the
boundary between them is simply a circle \
The surprise comes when we pick 0 to be non-zero, say c=-0.1237‘5
.has the choice Ween
+ 0.56508i. Here. too the sequence x0» x1 I» )9» . _
the three possibilities listed above, but the inner attractor (dot In Fig.3) is no
pi@raspberrypi3Bplus:~ $
```

Far away from good, you will have to read tesseract documentation on how to take images for best OCR processing (light, direction of light, post processing, ...).