choose the right for grape sorting project with image processing ...

Thread Starter

dashhossein

Joined Jul 30, 2020
19
hello every one
i want to do the grape sorting project for some educational goals ...
i doubt to which camera will work for that project ...
any body can help me to choose the right camera pls ...
the project will work like this youtube link
 

andrewmm

Joined Feb 25, 2011
572
Done a few of these sort of machines.
Normal to use a line scanner, not a camera as such, and make the objects move under the line scanner.

Look at the lighting, select what colour temprature to use , along with filters on the line scanner to detect the properties you want best. Remember jsut cause we cant' see in UV or IR, does not mean what you want to look at does not show up better at the extreams.

https://www.digikey.co.uk/product-detail/en/espros-photonics-ag/EPC901-CSP32-033/2199-EPC901-CSP32-033CT-ND/10516882

if you want to look at a camera,
then the Pi camera and board be a good starting point.

https://thepihut.com/collections/raspberry-pi-camera?gclid=CjwKCAjwm_P5BRAhEiwAwRzSO3U7Vhftof4mSxNxU0U-AfcfwB_aP8MSmu6WVB5ByzjhCcbxTjTKRhoCqCQQAvD_BwE
 

Thread Starter

dashhossein

Joined Jul 30, 2020
19
Done a few of these sort of machines.
Normal to use a line scanner, not a camera as such, and make the objects move under the line scanner.

Look at the lighting, select what colour temprature to use , along with filters on the line scanner to detect the properties you want best. Remember jsut cause we cant' see in UV or IR, does not mean what you want to look at does not show up better at the extreams.

https://www.digikey.co.uk/product-detail/en/espros-photonics-ag/EPC901-CSP32-033/2199-EPC901-CSP32-033CT-ND/10516882

if you want to look at a camera,
then the Pi camera and board be a good starting point.

https://thepihut.com/collections/raspberry-pi-camera?gclid=CjwKCAjwm_P5BRAhEiwAwRzSO3U7Vhftof4mSxNxU0U-AfcfwB_aP8MSmu6WVB5ByzjhCcbxTjTKRhoCqCQQAvD_BwE
i read the data sheet of epc 901 i think it's too small , it's about 1*8 mm and i think i no suitable tool for work with that if i want to work with raspberry pi which camera will work ? will a 60FPS work well ?
how about rgb sensors ? will they work ?
 

andrewmm

Joined Feb 25, 2011
572
Turn it around,
what processor system / board you looking at using ?
what camera have you seen that work with the chosen board ?

You ask about frame per second,
if you go for a frame camera, how are you going to ensure you don't miss grapes and don't over lap pictures ?
how are you looking at synchronising the picture with the item ?

when you look at the objects, how small do you wish to see ?

how fast are the objects moving,

At the basic level,
are you taking a picture and then moving the items on , or is it a continuous stream of items ?
 
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Thread Starter

dashhossein

Joined Jul 30, 2020
19
Turn it around,
what processor system / board you looking at using ?
what camera have you seen that work with the chosen board ?
for example if it's possible to with work with rgb sensor , i will work with esp 32 for processor
if that wasn't solution i choose raspberry

it will be the continuous stream of items
the electronic pneumatic valve will reject the unwanted grapes

only thing i don't know is what camera to choose
 
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Djsarakar

Joined Jul 26, 2020
310
for example if it's possible to with work with rgb sensor , i will work with esp 32 for processor
if that wasn't solution i choose raspberry

it will be the continuous stream of items
the electronic pneumatic valve will reject the unwanted grapes

only thing i don't know is what camera to choose
I think you should focus more on your project requirements.

Do you know at what speed the graps are coming?

Is your camera or scanner fast enough to give you the result of good or bad?

The camera can only take an image, but how will you decide whether the grapes are good or bad?

Do you have such a speed processor that can give results ?
 

andrewmm

Joined Feb 25, 2011
572
for example if it's possible to with work with rgb sensor , i will work with esp 32 for processor
if that wasn't solution i choose raspberry

it will be the continuous stream of items
the electronic pneumatic valve will reject the unwanted grapes

only thing i don't know is what camera to choose

You say you only want to know what camera

That's great

so tell us what you have decide for....

a) lighting level,
b) lighting constant or strobed , if strobed, period, and synchronisation to capture process.
c) smallest size of defect you wish to detect
d) processing time delay
e) light colour temperature
f) albino of the defects you wish to detect under the above light conditions,
g) speed of the objects in meters per second
h) width of detection area
i) distance between detection area and actuation area,
j) allowed percentage error rate


that will give us an idea as to what sort of sensor we could suggets for you,

As mentioned before, sorting machines tend to use line scanners, not frame grabbers as in standard web sameras.
 

Thread Starter

dashhossein

Joined Jul 30, 2020
19
I think you should focus more on your project requirements.

Do you know at what speed the graps are coming?

Is your camera or scanner fast enough to give you the result of good or bad?

The camera can only take an image, but how will you decide whether the grapes are good or bad?

Do you have such a speed processor that can give results ?
i will try will line sensors
thanks for answer
 

Thread Starter

dashhossein

Joined Jul 30, 2020
19
I think you should focus more on your project requirements.

Do you know at what speed the graps are coming?

Is your camera or scanner fast enough to give you the result of good or bad?

The camera can only take an image, but how will you decide whether the grapes are good or bad?

Do you have such a speed processor that can give results ?
i will try will line sensors
thanks for answer
 

ronsimpson

Joined Oct 7, 2019
908
, i want to do color sorting project with line sensor cc
The line sensor is B&W not color. To see in color you will need three line sensors and three filters.
The output is analog not digital so there is another problem.
I noticed the prices are very dependent on where you get the part.

For about the same money you can get a color camera.
1598880113808.png
1598879848147.png
 

Thread Starter

dashhossein

Joined Jul 30, 2020
19
could you tell me the exact name of cameras you mentioned ...
are they RGB sensors or they are diffrent ?
 
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ronsimpson

Joined Oct 7, 2019
908
Try this link. Pi cameras
If you are using a Pi computer then many (not all) USB cameras will work. USB

A color camera will have RGB sensors. Many years ago, when 640x480 was high resolution, we did machine vision on a PC but now a Raspberry Pi is more computer than what we had.

A quick search shows many people working on Raspberry Pi Machine vision.
Pi vision,
 
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Thread Starter

dashhossein

Joined Jul 30, 2020
19
Try this link. Pi cameras
If you are using a Pi computer then many (not all) USB cameras will work. USB

A color camera will have RGB sensors. Many years ago, when 640x480 was high resolution, we did machine vision on a PC but now a Raspberry Pi is more computer than what we had.

A quick search shows many people working on Raspberry Pi Machine vision.
Pi vision,
and for last questions
a 640x480 will work good for that project or not ?
i should try 120 FPS or less ?

will a RGB sensors like this work ?download.jpg
or i shuold use line scaners with filters ...
tnx for your help mr ronsimpson...
 
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