why my document is not OCR executed

[doriansong]

I identified a scan using the following configuration:

ingestor = (
    Ingestor(client=client)
    .files(file_arr)
    .extract(   
        document_type="pdf",          
        extract_text=True,
        # extract_tables=True,
        # extract_charts=True,
        extract_images=True,
        # extract_infographics=True,
        # paddle_output_format="markdown",
        # extract_method="nemoretriever_parse", # Slower, but maximally accurate, especially for PDFs with pages that are scanned images
        text_depth="page"
    )
    .split( 
        chunk_size=1024,
        chunk_overlap=50,
        params={"splite_source_types":['PDF']}
    )
    .embed(  
        endpoint_url="http://172.16.200.113:9997/v1",
        model_name="bge-m3",
    )
  
)

print the results using print(ingest_json_results_to_blob(results[0]))

The output shows that the pipe line mistook my scan for a picture
Is it my configuration problem？

Sample scanned document：

An example of the output results：

image_caption:[The image provided is a drawing of a large snake-like creature that appears to be a kind of serpent or dragon in an exaggerated, whimsical style. The creature has several pairs of feet and is winding through various objects and people.

Key elements include:
- A long serpentine body with multiple segments
- A cartoonish, almost comical appearance 
- Tentacle-like appendages emanating from its head and body 
- A trio of duck-like heads   
- It is shown interacting with townsfolk in a small village setting

The style is lighthearted and cartoonish, depicting this fantastical creature as more comical than menacing despite its intimidating size. The overall tone seems playful, presenting the creature's intrusion on the village life as an amusing encounter rather than a frightening threat.]