Cant check if I'm at the final element at the Block level

[Sicos1977]

Environment

• Tesseract Version: 5.0.0
• Platform: Windows 64 bit

Current Behavior:

int IsAtFinalElement(Block, Block); always returns 1 (true)

Expected Behavior:

To return 0 (false) when I'm not at the final element

Suggested Fix:

To return 0 (false) when I'm not at the final element

[zdenop]

Please provided minimal code for reproduction including a testing/input image.

[Sicos1977]

I'm using this Image

And the code is in C# because I'm writing a new C# wrapper (that is somewhat a copy of this one https://github.com/charlesw/tesseract

            const string resultPath = @"EngineTests\CanProcessPixUsingResultIterator.txt";
            var result = new StringBuilder();

            string actualResult;
            using (var engine = CreateEngine())
            {
                using (var img = LoadTestPix(TestImageFileColumn))
                {
                    using (var page = engine.Process(img))
                    {
                        foreach (var block in page.Layout)
                        {
                            result.AppendLine($"Block text: {block.Text}");
                            result.AppendLine($"Block confidence: {block.Confidence}");

                            foreach (var paragraph in block.Paragraphs)
                            {
                                result.AppendLine($"Paragraph text: {paragraph.Text}");
                                result.AppendLine($"Paragraph confidence: {paragraph.Confidence}");

                                foreach (var textLine in paragraph.TextLines)
                                {
                                    result.AppendLine($"Text line text: {textLine.Text}");
                                    result.AppendLine($"Text line confidence: {textLine.Confidence}");

                                    foreach (var word in textLine.Words)
                                    {
                                        result.AppendLine($"Word text: {word.Text}");
                                        result.AppendLine($"Word confidence: {word.Confidence}");
                                        result.AppendLine($"Word is from dictionary: {word.IsFromDictionary}");
                                        result.AppendLine($"Word is numeric: {word.IsNumeric}");
                                        result.AppendLine($"Word language: {word.Language}");

                                        //foreach (var symbol in word.Symbols)
                                        //{
                                        //    result.AppendLine($"Symbol text: {symbol.Text}");
                                        //    result.AppendLine($"Symbol confidence: {symbol.Confidence}");
                                        //    result.AppendLine($"Symbol is superscript: {symbol.IsSuperscript}");
                                        //    result.AppendLine($"Symbol is dropcap: {symbol.IsDropcap}");
                                        //}
                                    }
                                }
                            }
                        }

                        // TODO : Do some checking here

                        actualResult = result.ToString();
                        File.WriteAllText("d:\\result.txt", actualResult);
                    }
                }
            }

You can find how I implemend the enumerator in C# overhere --> https://github.com/Sicos1977/TesseractOCR/tree/master/TesseractOCR/Layout

I start at creating the Blocks class and then iterator over it.

[Sicos1977]

When I'm done one level, at the Paragraph level or lower I just can do this

https://github.com/Sicos1977/TesseractOCR/blob/master/TesseractOCR/Layout/Paragraphs.cs

[Sicos1977]

IsAtFinalElement expect 2 "elements" for example Paragraph and textLine but there is nothing above block so I have no idea what to give as a value at the first parameter. I tried -1 but that just gives an error.

[amitdo]

Here's a hint: https://github.com/tesseract-ocr/tesseract/blob/d8d63fd71b8d56f73469f7db41864098f087599c/src/api/hocrrenderer.cpp#L190-L195

https://github.com/tesseract-ocr/tesseract/blob/d8d63fd71b8d56f73469f7db41864098f087599c/src/api/hocrrenderer.cpp#L293

https://github.com/tesseract-ocr/tesseract/blob/d8d63fd71b8d56f73469f7db41864098f087599c/src/api/hocrrenderer.cpp#L443-L446

Please use our forum for asking questions.

[Sicos1977]

Thanks, I would not have figured that one out :-)