Errata
The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".
The following errata were submitted by our customers and approved as valid errors by the author or editor.
Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update
| Version | Location | Description | Submitted By | Date submitted | Date corrected |
|---|---|---|---|---|---|
| Printed | Page 21 4th line of first source code block |
and example source morphology.py : the method 'measurements.label()' in : m = 1*(im < 128l) labels, numObjects = measurements.label( im ) throws exception "data type not supported" in c:\Python27\lib\site-packages\scipy\ndimage\measurements.py, 167 im is a matrix of 0's and 1's. When using the statement im = ( im < 128 ) the program does work as expected. Here, im is a boolean array containing values True and False. This same type of array is returned by the line im = morphology.binary_opening(im, ones((9, 5)), iterations=2) in the (original) second part of the example. I am running Windows 7 64bit, python 2.7.3 32-bit, and scipy 0.11.0, numpy 1.6.2 (from the matching binary installer) Note from the Author or Editor: |
Frans van der Klip | Dec 19, 2012 | |
| Printed, PDF, ePub | Page 30 Last row of example, bottom of the page. |
The Harris response function code is missing a square of the trace in the denominator. The line return Wdet / Wtr should be return Wdet / (Wtr*Wtr) The code online has been updated. https://github.com/jesolem/PCV |
 Jan Erik Solem |
Jan 23, 2013 | |
| Printed | Page 31 At the middle of the page, in function get_harris_points() |
In the sentence index = argsort(candidate_values) The function argsort() sorts candidate_values in ASCENDING order. However, the text says, [sort them in descending order]. Therefore, the sentence index = argsort(candiate_values) should be revised as index = argsort(candidate_values)[::-1] Note: Oreilly seems not so actively to answer the errata. There are so many submitted errata remained unconfirmed long time. Some of errata are questions from reader. Note from the Author or Editor: |
ColorRGB | Jul 02, 2013 | |
| Printed | Page 40 the center of the code |
matchscores = zeros((desc1_size[0],1),'int') should be matchscores = zeros(desc1_size[0],'int') Note from the Author or Editor: |
aikawa | Feb 17, 2013 | |
| Printed | Page 48 the last line in the code |
The code: g.write_png('graph.jpg', prog='neato') writes graph.jpg as a PNG file. This should be: g.write_png('graph.png', prog='neato') Note from the Author or Editor: |
aikawa | Mar 10, 2013 | |
| Printed | Page 63 6th line |
The body text says 'turningtorso_points.txt', but, it is referred as 'turningtorso1_ponts.txt' in the code on P.64, Note from the Author or Editor: |
aikawa | Mar 10, 2013 | |
| Printed | Page 76 Fourth row from bottom |
The index "j+1" should be "4". Replace im1 = array(Image.open(imname[j+1])) with im1 = array(Image.open(imname[4])) |
Jan Erik Solem |
May 06, 2013 | |
| Printed | Page 88 10th line down |
When running code in book, program stops and I get the following error: box_trans = homography.normalize(dot(H,box_cam1)) ValueError: setting an array element with a sequence. Runs fine up to this point. Note from the Author or Editor: |
Doug Blanding | Sep 27, 2012 | |
| Printed | Page 91 code |
aspect = (width*fy)/(height*fx) will truncate the value if the all values are integer. This should be: aspect = float(width*fy)/(height*fx) Note from the Author or Editor: |
aikawa | Feb 17, 2013 | |
| Printed | Page 150 code |
import vlfeat as sift should be import sift Note from the Author or Editor: |
aikawa | Feb 23, 2013 | |
| Printed | Page 152,154 code |
from pysqlite2 import dbapi2 as sqlite should be now: from sqlite3 import dbapi2 as sqlite Note from the Author or Editor: |
aikawa | Feb 23, 2013 | |
| Printed | Page 154 code |
The comment says "go through all images", but the code below it loops only the first 100 images. for i in range(nbr_images)[:100]: should be for i in range(nbr_images): Note from the Author or Editor: |
aikawa | Mar 13, 2013 | |
| Printed | Page 175 Line 7, 8 from top |
There are two misprints in these two lines. The 'test_labels' should be simply 'labels'. Note from the Author or Editor: |
ColorRGB | Feb 21, 2013 | |
| Printed, PDF, ePub, Mobi, Safari Books Online | Page 182 Code example at the bottom of the page |
The tiny helper function convert_labels is missing from this example. def convert_labels(labels,transl): """ Convert between strings and numbers. """ return [transl[l] for l in labels] |
Jan Erik Solem |
Feb 10, 2013 | |
| Printed | Page 186 Line 4 in the first paragraph |
Figure 8-8 should be Figure 8-7 Note from the Author or Editor: |
ColorRGB | Feb 26, 2013 | |
| Printed | Page 212,213 P212: at the end of the first code; P213: at the end of the code |
Bothe codes teriminated normally when run on the MSDOS command line. However they can not terminated when run in IDLE(Python GUI) and PyScripter. Adding the following function at the end of the code can solve this problem for most of platform. cv2.destroyAllWindows() Note from the Author or Editor: |
ColorRGB | Feb 28, 2013 |