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Use upload librairie with generated picture

I use upload librarie to send my picture on database/folder, and it work fine. Now, i juste jquery cropper (Croppie.js) and recieve the data of image in data64 format. I want to know, how use Upload Librarie with data64 img in input type text ?

I try (controller just under) to define my picture generated ($img_handler) on the do_upload function. (But its dont work).
I juste want to recieve my picture on data64 format and use librarie upload to encrypt, upload_path... 

Do you have solution ?

   public function addBand()
       $config['upload_path']   = './uploads/bands';
       $config['allowed_types'] = 'gif|jpg|png';
       $config['encrypt_name'] = TRUE;
       $this->load->library('upload', $config);

       $img64 = $this->input->post('imagebase64');
       $exploded = explode(',', $img64, 2);
       $encoded = $exploded[1];
       $decoded = base64_decode($encoded);
       $img_handler = imagecreatefromstring($decoded);

       if ( ! $this->upload->do_upload('picture')) {
           $error = array('error' => $this->upload->display_errors());
           $this->session->set_flashdata('error', $error);

       else {
           $upload_data = $this->upload->data('file_name');
           $file_name = $upload_data['file_name'];

           $data = array(
               'bName' => $this->input->post('name'),
               'bPicture' => $file_name
           $this->session->set_flashdata('success', "Groupe ajouté");

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