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This PR allows element types with CamelCase names to be extractable using `extract_image_block_types` variable. Before: specify `extract_image_block_types=["NarrativeText"]` (or any casing for `NarrativeText`) would raise a warning that it doesn't match any available types and not image would be extracted for this element type Now: specify `extract_image_block_types=["NarrativeText"]` would extract images for this element type ## testing ```python from unstructured.partition.auto import partition f = "example-docs/pdf/embedded-images-tables.pdf" elements = partition(f, strategy="hi_res", extract_image_block_types=["narrativetext"]) ``` Without this PR no figures would be extracted. With this PR a local folder would be created to contain images of the narrative text elements in path like `./figures/figure-1-1.jpg` --------- Co-authored-by: ryannikolaidis <1208590+ryannikolaidis@users.noreply.github.com>