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telemetry.internal.image_processing.screen_finder.html

telemetry.internal.image_processing.screen_finder.html 11 KB
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  1. 

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    3. 

  3. <html><head><title>Python: module telemetry.internal.image_processing.screen_finder</title>
    4. 

  4. <meta charset="utf-8">
    5. 

  5. </head><body bgcolor="#f0f0f8">
    6. 

  6. 

  7. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading">
    8. 

  8. <tr bgcolor="#7799ee">
    9. 

  9. <td valign=bottom>&nbsp;<br>
    10. 

  10. <font color="#ffffff" face="helvetica, arial">&nbsp;<br><big><big><strong><a href="telemetry.html"><font color="#ffffff">telemetry</font></a>.<a href="telemetry.internal.html"><font color="#ffffff">internal</font></a>.<a href="telemetry.internal.image_processing.html"><font color="#ffffff">image_processing</font></a>.screen_finder</strong></big></big></font></td
    11. 

  11. ><td align=right valign=bottom
    12. 

  12. ><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="../telemetry/internal/image_processing/screen_finder.py">telemetry/internal/image_processing/screen_finder.py</a></font></td></tr></table>
    13. 

  13.     <p><tt>#&nbsp;Copyright&nbsp;2014&nbsp;The&nbsp;Chromium&nbsp;Authors.&nbsp;All&nbsp;rights&nbsp;reserved.<br>
    14. 

  14. #&nbsp;Use&nbsp;of&nbsp;this&nbsp;source&nbsp;code&nbsp;is&nbsp;governed&nbsp;by&nbsp;a&nbsp;BSD-style&nbsp;license&nbsp;that&nbsp;can&nbsp;be<br>
    15. 

  15. #&nbsp;found&nbsp;in&nbsp;the&nbsp;LICENSE&nbsp;file.<br>
    16. 

  16. #<br>
    17. 

  17. #&nbsp;This&nbsp;script&nbsp;attempts&nbsp;to&nbsp;detect&nbsp;the&nbsp;region&nbsp;of&nbsp;a&nbsp;camera's&nbsp;field&nbsp;of&nbsp;view&nbsp;that<br>
    18. 

  18. #&nbsp;contains&nbsp;the&nbsp;screen&nbsp;of&nbsp;the&nbsp;device&nbsp;we&nbsp;are&nbsp;testing.<br>
    19. 

  19. #<br>
    20. 

  20. #&nbsp;Usage:&nbsp;./screen_finder.py&nbsp;path_to_video&nbsp;0&nbsp;0&nbsp;--verbose</tt></p>
    21. 

  21. <p>
    22. 

  22. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
    23. 

  23. <tr bgcolor="#aa55cc">
    24. 

  24. <td colspan=3 valign=bottom>&nbsp;<br>
    25. 

  25. <font color="#ffffff" face="helvetica, arial"><big><strong>Modules</strong></big></font></td></tr>
    26. 

  26.     
    27. 

  27. <tr><td bgcolor="#aa55cc"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
    28. 

  28. <td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="copy.html">copy</a><br>
    29. 

  29. <a href="cv2.html">cv2</a><br>
    30. 

  30. <a href="telemetry.internal.image_processing.cv_util.html">telemetry.internal.image_processing.cv_util</a><br>
    31. 

  31. </td><td width="25%" valign=top><a href="telemetry.internal.util.external_modules.html">telemetry.internal.util.external_modules</a><br>
    32. 

  32. <a href="telemetry.internal.image_processing.frame_generator.html">telemetry.internal.image_processing.frame_generator</a><br>
    33. 

  33. <a href="logging.html">logging</a><br>
    34. 

  34. </td><td width="25%" valign=top><a href="numpy.html">numpy</a><br>
    35. 

  35. <a href="os.html">os</a><br>
    36. 

  36. <a href="sys.html">sys</a><br>
    37. 

  37. </td><td width="25%" valign=top><a href="telemetry.internal.image_processing.video_file_frame_generator.html">telemetry.internal.image_processing.video_file_frame_generator</a><br>
    38. 

  38. </td></tr></table></td></tr></table><p>
    39. 

  39. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
    40. 

  40. <tr bgcolor="#ee77aa">
    41. 

  41. <td colspan=3 valign=bottom>&nbsp;<br>
    42. 

  42. <font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
    43. 

  43.     
    44. 

  44. <tr><td bgcolor="#ee77aa"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
    45. 

  45. <td width="100%"><dl>
    46. 

  46. <dt><font face="helvetica, arial"><a href="__builtin__.html#object">__builtin__.object</a>
    47. 

  47. </font></dt><dd>
    48. 

  48. <dl>
    49. 

  49. <dt><font face="helvetica, arial"><a href="telemetry.internal.image_processing.screen_finder.html#ScreenFinder">ScreenFinder</a>
    50. 

  50. </font></dt></dl>
    51. 

  51. </dd>
    52. 

  52. </dl>
    53. 

  53.  <p>
    54. 

  54. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
    55. 

  55. <tr bgcolor="#ffc8d8">
    56. 

  56. <td colspan=3 valign=bottom>&nbsp;<br>
    57. 

  57. <font color="#000000" face="helvetica, arial"><a name="ScreenFinder">class <strong>ScreenFinder</strong></a>(<a href="__builtin__.html#object">__builtin__.object</a>)</font></td></tr>
    58. 

  58.     
    59. 

  59. <tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
    60. 

  60. <td colspan=2><tt>Finds&nbsp;and&nbsp;extracts&nbsp;device&nbsp;screens&nbsp;from&nbsp;video.<br>
    61. 

  61. &nbsp;<br>
    62. 

  62. Sample&nbsp;Usage:<br>
    63. 

  63. &nbsp;&nbsp;sf&nbsp;=&nbsp;<a href="#ScreenFinder">ScreenFinder</a>(sys.argv[1])<br>
    64. 

  64. &nbsp;&nbsp;while&nbsp;sf.<a href="#ScreenFinder-HasNext">HasNext</a>():<br>
    65. 

  65. &nbsp;&nbsp;&nbsp;&nbsp;ret,&nbsp;screen&nbsp;=&nbsp;sf.<a href="#ScreenFinder-GetNext">GetNext</a>()<br>
    66. 

  66. &nbsp;<br>
    67. 

  67. Attributes:<br>
    68. 

  68. &nbsp;&nbsp;_lost_corners:&nbsp;Each&nbsp;index&nbsp;represents&nbsp;whether&nbsp;or&nbsp;not&nbsp;we&nbsp;lost&nbsp;track&nbsp;of&nbsp;that<br>
    69. 

  69. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;corner&nbsp;on&nbsp;the&nbsp;previous&nbsp;frame.&nbsp;Ordered&nbsp;by&nbsp;[top-right,&nbsp;top-left,<br>
    70. 

  70. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bottom-left,&nbsp;bottom-right]<br>
    71. 

  71. &nbsp;&nbsp;_frame:&nbsp;An&nbsp;unmodified&nbsp;copy&nbsp;of&nbsp;the&nbsp;frame&nbsp;we're&nbsp;currently&nbsp;processing.<br>
    72. 

  72. &nbsp;&nbsp;_frame_debug:&nbsp;A&nbsp;copy&nbsp;of&nbsp;the&nbsp;frame&nbsp;we're&nbsp;currently&nbsp;processing,&nbsp;may&nbsp;be<br>
    73. 

  73. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;modified&nbsp;at&nbsp;any&nbsp;time,&nbsp;used&nbsp;for&nbsp;debugging.<br>
    74. 

  74. &nbsp;&nbsp;_frame_grey:&nbsp;A&nbsp;greyscale&nbsp;copy&nbsp;of&nbsp;the&nbsp;frame&nbsp;we're&nbsp;currently&nbsp;processing.<br>
    75. 

  75. &nbsp;&nbsp;_frame_edges:&nbsp;A&nbsp;Canny&nbsp;Edge&nbsp;detected&nbsp;copy&nbsp;of&nbsp;the&nbsp;frame&nbsp;we're&nbsp;currently<br>
    76. 

  76. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;processing.<br>
    77. 

  77. &nbsp;&nbsp;_screen_size:&nbsp;The&nbsp;size&nbsp;of&nbsp;device&nbsp;screen&nbsp;in&nbsp;the&nbsp;video&nbsp;when&nbsp;first&nbsp;detected.<br>
    78. 

  78. &nbsp;&nbsp;_avg_corners:&nbsp;Exponentially&nbsp;weighted&nbsp;average&nbsp;of&nbsp;the&nbsp;previous&nbsp;corner<br>
    79. 

  79. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;locations.<br>
    80. 

  80. &nbsp;&nbsp;_prev_corners:&nbsp;The&nbsp;location&nbsp;of&nbsp;the&nbsp;corners&nbsp;in&nbsp;the&nbsp;previous&nbsp;frame.<br>
    81. 

  81. &nbsp;&nbsp;_lost_corner_frames:&nbsp;A&nbsp;counter&nbsp;of&nbsp;the&nbsp;number&nbsp;of&nbsp;successive&nbsp;frames&nbsp;in&nbsp;which<br>
    82. 

  82. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;we've&nbsp;lost&nbsp;a&nbsp;corner&nbsp;location.<br>
    83. 

  83. &nbsp;&nbsp;_border:&nbsp;See&nbsp;|border|&nbsp;above.<br>
    84. 

  84. &nbsp;&nbsp;_min_line_length:&nbsp;The&nbsp;minimum&nbsp;length&nbsp;a&nbsp;line&nbsp;must&nbsp;be&nbsp;before&nbsp;we&nbsp;consider&nbsp;it<br>
    85. 

  85. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a&nbsp;possible&nbsp;screen&nbsp;edge.<br>
    86. 

  86. &nbsp;&nbsp;_frame_generator:&nbsp;See&nbsp;|frame_generator|&nbsp;above.<br>
    87. 

  87. &nbsp;&nbsp;_width,&nbsp;_height:&nbsp;The&nbsp;width&nbsp;and&nbsp;height&nbsp;of&nbsp;the&nbsp;frame.<br>
    88. 

  88. &nbsp;&nbsp;_anglesp5,&nbsp;_anglesm5:&nbsp;The&nbsp;angles&nbsp;for&nbsp;each&nbsp;point&nbsp;we&nbsp;look&nbsp;at&nbsp;in&nbsp;the&nbsp;grid<br>
    89. 

  89. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;when&nbsp;computing&nbsp;brightness,&nbsp;constant&nbsp;across&nbsp;frames.<br>&nbsp;</tt></td></tr>
    90. 

  90. <tr><td>&nbsp;</td>
    91. 

  91. <td width="100%">Methods defined here:<br>
    92. 

  92. <dl><dt><a name="ScreenFinder-GetNext"><strong>GetNext</strong></a>(self)</dt><dd><tt>Gets&nbsp;the&nbsp;next&nbsp;screen&nbsp;image.<br>
    93. 

  93. &nbsp;<br>
    94. 

  94. Returns:<br>
    95. 

  95. &nbsp;&nbsp;A&nbsp;numpy&nbsp;matrix&nbsp;containing&nbsp;the&nbsp;screen&nbsp;surrounded&nbsp;by&nbsp;the&nbsp;number&nbsp;of&nbsp;border<br>
    96. 

  96. &nbsp;&nbsp;pixels&nbsp;specified&nbsp;in&nbsp;initialization,&nbsp;and&nbsp;the&nbsp;location&nbsp;of&nbsp;the&nbsp;detected<br>
    97. 

  97. &nbsp;&nbsp;screen&nbsp;corners&nbsp;in&nbsp;the&nbsp;current&nbsp;frame,&nbsp;if&nbsp;a&nbsp;screen&nbsp;is&nbsp;found.&nbsp;The&nbsp;returned<br>
    98. 

  98. &nbsp;&nbsp;screen&nbsp;is&nbsp;guaranteed&nbsp;to&nbsp;be&nbsp;the&nbsp;same&nbsp;size&nbsp;at&nbsp;each&nbsp;frame.<br>
    99. 

  99. &nbsp;&nbsp;'None'&nbsp;and&nbsp;'None'&nbsp;if&nbsp;no&nbsp;screen&nbsp;was&nbsp;found&nbsp;on&nbsp;the&nbsp;current&nbsp;frame.<br>
    100. 

  100. &nbsp;<br>
    101. 

  101. Raises:<br>
    102. 

  102. &nbsp;&nbsp;FrameReadError:&nbsp;An&nbsp;error&nbsp;occurred&nbsp;in&nbsp;the&nbsp;FrameGenerator.<br>
    103. 

  103. &nbsp;&nbsp;RuntimeError:&nbsp;This&nbsp;method&nbsp;was&nbsp;called&nbsp;when&nbsp;no&nbsp;frames&nbsp;were&nbsp;available.</tt></dd></dl>
    104. 

  104. 

  105. <dl><dt><a name="ScreenFinder-HasNext"><strong>HasNext</strong></a>(self)</dt><dd><tt>True&nbsp;if&nbsp;there&nbsp;are&nbsp;more&nbsp;frames&nbsp;available&nbsp;to&nbsp;process.</tt></dd></dl>
    106. 

  106. 

  107. <dl><dt><a name="ScreenFinder-__init__"><strong>__init__</strong></a>(self, frame_generator, border<font color="#909090">=5</font>)</dt><dd><tt>Initializes&nbsp;the&nbsp;<a href="#ScreenFinder">ScreenFinder</a>&nbsp;<a href="__builtin__.html#object">object</a>.<br>
    108. 

  108. &nbsp;<br>
    109. 

  109. Args:<br>
    110. 

  110. &nbsp;&nbsp;frame_generator:&nbsp;FrameGenerator,&nbsp;An&nbsp;initialized&nbsp;Video&nbsp;Frame&nbsp;Generator.<br>
    111. 

  111. &nbsp;&nbsp;border:&nbsp;int,&nbsp;number&nbsp;of&nbsp;pixels&nbsp;of&nbsp;border&nbsp;to&nbsp;be&nbsp;kept&nbsp;when&nbsp;cropping&nbsp;the<br>
    112. 

  112. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;detected&nbsp;screen.<br>
    113. 

  113. &nbsp;<br>
    114. 

  114. Raises:<br>
    115. 

  115. &nbsp;&nbsp;FrameReadError:&nbsp;The&nbsp;frame&nbsp;generator&nbsp;may&nbsp;output&nbsp;a&nbsp;read&nbsp;error&nbsp;during<br>
    116. 

  116. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;initialization.</tt></dd></dl>
    117. 

  117. 

  118. <hr>
    119. 

  119. Data descriptors defined here:<br>
    120. 

  120. <dl><dt><strong>__dict__</strong></dt>
    121. 

  121. <dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
    122. 

  122. </dl>
    123. 

  123. <dl><dt><strong>__weakref__</strong></dt>
    124. 

  124. <dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
    125. 

  125. </dl>
    126. 

  126. <hr>
    127. 

  127. Data and other attributes defined here:<br>
    128. 

  128. <dl><dt><strong>CANNY_HYSTERESIS_THRESH_HIGH</strong> = 500</dl>
    129. 

  129. 

  130. <dl><dt><strong>CANNY_HYSTERESIS_THRESH_LOW</strong> = 300</dl>
    131. 

  131. 

  132. <dl><dt><strong>CORNER_AVERAGE_WEIGHT</strong> = 0.5</dl>
    133. 

  133. 

  134. <dl><dt><strong>CornerData</strong> = &lt;class 'telemetry.internal.image_processing.screen_finder.CornerData'&gt;</dl>
    135. 

  135. 

  136. <dl><dt><strong>DEBUG</strong> = False</dl>
    137. 

  137. 

  138. <dl><dt><strong>MAX_INTERFRAME_MOTION</strong> = 25</dl>
    139. 

  139. 

  140. <dl><dt><strong>MIN_CORNER_ABSOLUTE_BRIGHTNESS</strong> = 60</dl>
    141. 

  141. 

  142. <dl><dt><strong>MIN_RELATIVE_BRIGHTNESS_FACTOR</strong> = 1.5</dl>
    143. 

  143. 

  144. <dl><dt><strong>MIN_SCREEN_WIDTH</strong> = 40</dl>
    145. 

  145. 

  146. <dl><dt><strong>RESET_AFTER_N_BAD_FRAMES</strong> = 2</dl>
    147. 

  147. 

  148. <dl><dt><strong>SMALL_ANGLE</strong> = 0.08726646259971647</dl>
    149. 

  149. 

  150. <dl><dt><strong>ScreenNotFoundError</strong> = &lt;class 'telemetry.internal.image_processing.screen_finder.ScreenNotFoundError'&gt;</dl>
    151. 

  151. 

  152. </td></tr></table></td></tr></table><p>
    153. 

  153. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
    154. 

  154. <tr bgcolor="#eeaa77">
    155. 

  155. <td colspan=3 valign=bottom>&nbsp;<br>
    156. 

  156. <font color="#ffffff" face="helvetica, arial"><big><strong>Functions</strong></big></font></td></tr>
    157. 

  157.     
    158. 

  158. <tr><td bgcolor="#eeaa77"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
    159. 

  159. <td width="100%"><dl><dt><a name="-main"><strong>main</strong></a>()</dt></dl>
    160. 

  160. </td></tr></table><p>
    161. 

  161. <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
    162. 

  162. <tr bgcolor="#55aa55">
    163. 

  163. <td colspan=3 valign=bottom>&nbsp;<br>
    164. 

  164. <font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></font></td></tr>
    165. 

  165.     
    166. 

  166. <tr><td bgcolor="#55aa55"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
    167. 

  167. <td width="100%"><strong>division</strong> = _Feature((2, 2, 0, 'alpha', 2), (3, 0, 0, 'alpha', 0), 8192)</td></tr></table>
    168. 

  168. </body></html>
    169.