"The foregoing and other embodiments can each optionally include one or more of the following features, alone or in combination. The actions include determining the one or more section headings from the scanned copy of the printed book. Each search result includes a page number of the printed book. The section headings include one or more section headings corresponding to book chapters and having a section title that includes a title of the corresponding book chapter. The presentation further includes a presentation of n-grams extracted from the text of the book resource. The presentation of each n-gram includes a link, and wherein selection of a link for an n-gram initiates a search of the book resource with a query including the n-gram. The actions include computing a section score of each of one or more n-grams in each section of the book resource in which each n-gram occurs; computing a book score for each distinct n-gram using each section score for the n-gram; and ordering the n-grams by computed book score.
"In general, another innovative aspect of the subject matter described in this specification can be embodied in methods that include the actions of receiving a request for a book resource; generating one or more queries, each query including a distinct n-gram extracted from text obtained from a scanned copy of a printed book corresponding to the book resource; generating a presentation of search results that satisfy each of the one or more generated queries, wherein each of the search results identifies a portion of the book resource, the presentation comprising one or more headings each corresponding to one of the one or more n-grams, wherein the one or more headings are presented in an order corresponding to a computed book score, and, a group of one or more search results with each heading, each group associated with the corresponding query, each search result associated with a location within the printed book, each search result including a snippet of text from the book resource that includes one or more terms of the corresponding query, and wherein each search result includes a link to an image of a scanned page of the printed book in which the snippet of text occurs; and providing the presentation of search results in response to the query. Other embodiments of this aspect include corresponding computer systems, apparatus, and computer programs recorded on one or more computer storage devices, each configured to perform the actions of the methods.
"The foregoing and other embodiments can each optionally include one or more of the following features, alone or in combination. Each search result includes a page number of the printed book. Each heading includes text of the n-gram. The actions include computing a section score for each of the one or more n-grams in each section of the book resource in which each n-gram occurs; computing a book score for each distinct n-gram using each section score for the n-gram; ranking the n-grams by computed book scores; and obtaining search results for each of one or more highest-ranked n-grams, wherein generating the presentation of search results comprises generating the presentation of search results using the obtained search results for each of the one or more highest-ranked n-grams. The section score for an n-gram is a term frequency-inverse document frequency score for the n-gram in each section of the book resource in which the n-gram occurs. The book score for each n-gram is based at least in part on a sum of each section score for the n-gram. The book score for each n-gram is based at least in part on a rank of the n-gram in each section according to the section score.
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