Imread error in Raspberry pi deployment

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Hello everyone!
I wrote small function, including imread(), and tried to deploy in Raspberry PI. But I got this error “The function imread uses a precompiled shared library which is not supported on the chosen target.”
Does it mean I cannot use imread() in Raspberry PI? Shall I need to use fread() or fopen() to read the image files in Raspberry system?
  3 Comments
Joseph Neelen
Joseph Neelen on 20 Aug 2023
Moved: Walter Roberson on 20 Aug 2023
I use Pi3B with sensehat. Its working perfect. Using MATLAB all sensehat functions are oké. Except the 8x8 LED matrix. WritePixel, wrieMessage show no result without errond massages.

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Accepted Answer

Walter Roberson
Walter Roberson on 4 Aug 2021
Edited: Walter Roberson on 4 Aug 2021
Two cases:
If the file is a static file available to the matlab host, with constant name, then read the image and save it to a mat. Then in the code to be deployed, coder.load()
If the file is not a static file with fixed name, such as if it is a file from the raspberry file system (especially one with dynamic name) then use coder.ceval() to make a call to an external library routine to do the reading work, such invoking libjpeg
  6 Comments
Walter Roberson
Walter Roberson on 2 Apr 2022
Is there a reason you cannot preprocess the files to become just arrays of pixel data, or at most arrays of pixel data with a size header?
Haitham Kanj
Haitham Kanj on 4 Apr 2022
@Walter Roberson, my code finally worked. I ended up using stb_image library to read the image and store the data as arrays of pixel data. What worked for me was declaring a global variable that both the c-files and matlab files can see during code generation, and the c-files where responsible for loading the global variable (3D array) with pixel data which then matlab can use.
I really had a hard time figuring things out. There are a lot of details that need to be considered before attempting to substitute imread with c-files and if you miss one of them, nothing will work.
Thank you @Walter Roberson, you gave me a starting point when you said use coder.ceval() to call external librariries. For those who have similar trouble using imread with codegen for raspberry pi, i can help you out haitham.kanj@lau.edu

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