Difficulty passing the title of the image to camera callback

My model has 2 attributes, image_uri and title. image_uri is defined as a blob attribute in image.rb. The intention is to allow the user to enter a title for the image and then to choose or take a picture and then store the same in the model.

Initially, there is no record, so on clicking "New" button on the index page, the user is taken to new.erb :

<div data-role="page">

  <div data-role="header" data-position="inline">

    <h1>New <%= @image.title %></h1>

    <a href="<%= url_for :action => :index %>" class="ui-btn-left" data-icon="back" data-direction="reverse">

      Cancel

    </a>

  </div>

  <div data-role="content">

    <form method="POST" action="<%= url_for :action => :create %>">

      <input type="hidden" name="id" value="<%= @image.object %>"/>

          <div data-role="fieldcontain">

            <label for="image[title]" class="fieldLabel">Title</label>

            <input type="text" id="image[title]" name="image[title]" <%= placeholder("Title") %> />

          </div>

          <div data-role="fieldcontain">

            <label for="image[image_uri]" class="fieldLabel">Image uri</label>

            <input type="text" id="image[image_uri]" name="image[image_uri]" <%= placeholder("Image URI") %> />

          </div>

      <input type="submit" value="Create"/>

    </form>

  </div>

</div>

Here's my create method in controller as well as the callback :

# POST /Image/create

  def create  

        Camera::choose_picture(url_for :action => :camera_callback)

        ""

  end

  def camera_callback

     if @params['status'] == 'ok'

       @image=Image.new({'image_uri' => @params['image_uri'],'title' => @params['title']})

       @image.save

     end

     WebView.navigate( url_for :action => :index )

     ""

   end

The problem is that the record is created, but only image_uri is saved, whereas title is not.

It looks like when camera_callback is called, @params['title'] is lost.

So, how do I pass in the value of title to the callback?

Or is there another/better way?

I'm sure this is a piece of cake to many of you folks!

TIA